Professor Justin Harris

A19 - Griffith Taylor Building
The University of Sydney


Website • Contact Details
• Transcranial Magnetic Stimulation Lab

Biographical details

Justin Harris graduated with a PhD in Psychology from The University of New South Wales in 1995. After working as a post-doctoral researcher in Verona and Trieste, in Italy, as well as at The University of NSW, he joined the School of Psychology at The University of Sydney in 2002. He is currently a Research Fellow, funded by a Future Fellowship from the Australian Research Council.

Research interests

My research is broadly concerned with the neural and behavioural mechanisms underlying learning, memory, and perception.

Current issues in associative learning

Learning the temporal relationships between events is crucial for the survival of any complex organism, allowing it to use its past to predict the future and adjust its behaviour accordingly. Pavlovian conditioning is an attempt to bring such relationships into the laboratory in order to isolate those that produce learning, describe its contents, and specify its influences on behaviour. My research studies how rats learn about cues that signal when food is delivered.If food arrives consistently at a specific time during the cue (e.g., always 30 s after the cue comes on), rats learn this relation and their anticipatory behaviours (checking the food dish) peak at the appropriate moment. This is in part due to an abrupt switch from a low to a high state of anticipation, characteristic of a decision point as the expected time of food approaches. Rats are also very sensitive to the temporal information provided by a cue even when it signals food after a variable delay (rather than at a consistent time). When faced with such a variable cue, animals show a constant level of anticipation at each moment during the cue. Nonetheless, the rate of their responding is directly related to the average time they should expect to wait for food. For example, they show more anticipatory responses if the average waiting time is 20 s than if it is 40 s. Indeed, each unit of time that is added to the average delay of food produces a fixed increase in how long the rat will wait between checking the dish for food. Moreover, rats respond to a compound of two variable cues for food by adding together the expected reward rate of each cue. This tells us that the rate of reward, or something linearly related to reward rate, is the content of what the rats have learned about the cue-food relationship.

As summarise above, learning about cues for food is strictly related to the amount of time spent waiting for food during the cue. However, this is not true for the extinction of that learning—i.e., learning to stop responding to a cue if it no longer signals food. Extinction is determined by the number of times that the rat has experienced the cue without food, rather than the amount of time it has experienced the cue without food. Moreover, the extinction of responding is affected by the number of times the cue occurred with food versus without food during conditioning, but is not affected by the amount of time the cue has been presented before food. Each time that a cue has been presented without food during conditioning (i.e., if the cue is presented with food on fewer than 100% of occasions) postpones the subsequent extinction of responding that occurs when all food delivery is stopped. Thus, time affects learning and extinction in different ways: time as continuous experience affects learning to anticipate food, whereas time in episodic form affects how that anticipation is extinguished.

Transcranial Magnetic Stimulation (TMS)

Our lab has developed psychophysical tools for investigating the effects of TMS and extending its use as a technique for functional brain mapping. Some of this work has involved measuring the interaction between the impact of TMS on perception and the effect of noise added to the sensory stimulus. The effect of TMS increases systematically when noise is added to the visual stimulus (e.g., when white noise is superimposed on an image). Put differently, TMS multiplicatively increases the effect of noise in impairing visual discrimination. These findings suggest that TMS reduces the strength of the sensory signal in the brain, perhaps by interrupting an ongoing accumulation of sensory evidence within the cortical circuits.

Our research has also shown that, at low intensities, TMS can enhance sensory performance, in contrast to the well-known impairment produced by stronger stimulation. In this novel procedure, a weak TMS pulse provides a small excitatory input to neurons. This small input sums with a weak excitatory input to those same neurons arising from a very faint stimulus, but only if the TMS is delivered to those neurons whose receptive fields incorporate the stimulus and if the timing of the TMS and sensory input are precisely matched. Under these circumstances, subjects can “see” the sum of these inputs even though they cannot see either input on its own.

Most recently, we have begun to use TMS to examine neuronal excitability in motor cortex in order to investigate how people can exert deliberate control over simple associative learning. This work aims to understand 1) how well-learned responses are prepared in the presence of cues that signal those responses, 2) how these responses are brought under cognitive control when response requirements change and 3) what happens to behaviour when that control is impaired.

Current research students

Project title Research student
Transcranial magnetic stimulation, inhibitory control and gambling Nahian CHOWDHURY

Selected grants

2016

  • BrainVision 64-channel EEG system; Alais D, Holcombe A, Harris J; DVC Research/Equipment Grant.
  • Associative learning and cognitive control; Livesey E, Harris I, Harris J, Miniussi C; Australian Research Council (ARC)/Discovery Projects (DP).

2015

  • Inhibition and Extinction in Associative Learning; Harris J; Australian Research Council (ARC)/Discovery Projects (DP).

2013

  • Learning whether and learning when: Rate and timing in human associative learning; Harris J, Livesey E; Australian Research Council (ARC)/Discovery Projects (DP).

2011

  • Mechanisms of Associative Learning in Humans; Harris J; Australian Research Council (ARC)/Future Fellowships (FT).

2010

  • Probability and Timing in Associative Learning; Harris J; Australian Research Council (ARC)/Discovery Projects (DP).

2009

  • Peripheral and central mechanisms of sensory coding and integration; Harris J, Clifford C, Arabzadeh E; Australian Research Council (ARC)/Discovery Projects (DP).

2007

  • Stimulus representation in associative learning: Testing a new computational model; Harris J, Westbrook F; Australian Research Council (ARC)/Discovery Projects (DP).

2006

  • The Influence of/Interactions between Vision on/and Touch; Harris J, Clifford C; Australian Research Council (ARC)/Discovery Projects (DP).
  • Optimizing autonomous system control with brain-like hierarchical control systems; Harris J, Breakspear M, Sammut C, Goodhill G, Paxinos G, Lovell N, Knock S, Lagopoulos J, Malhi G, Macefield V, Morley J; Australian Research Council (ARC)/Special Research Initiatives.

2004

  • The associative mechanisms underlying extinction and latent inhibition; Harris J, Westbrook F; Australian Research Council (ARC)/Discovery Projects (DP).

2003

  • Factors Governing Learning and Remembering of Simple Associations; Harris J; DVC Research/Research and Development Scheme: Newly Appointed Staff (NAS).
  • The contribution of early sensory cortex to working memory; Harris J; Australian Research Council (ARC)/Discovery Projects (DP).

2000

  • Cortical representation and storage of tactile events; Harris J, Diamond M; McDonnell-Pew Foundation/International Program in Cognitive Neuroscience.

Selected publications

Download citations: PDF RTF Endnote

Book Chapters

  • Holmes, N., Harris, J. (2010). Latent inhibition. In Chris J. Mitchell, Mike E. Le Pelley (Eds.), Attention and Associative Learning From Brain to Behaviour, (pp. 99-130). Oxford: Oxford University Press.
  • Clifford, C., Arabzadeh, E., Harris, J. (2010). Operating characteristics and awareness. In Elaine Perry, Daniel Collerton, Fiona LeBeau, Heather Ashton (Eds.), New Horizons in the Neuroscience of Consciousness, (pp. 103-111). Amsterdam: John Benjamins Publishing Company.
  • Harris, J. (2010). The arguments of associations. In Nestor Schmajuk (Eds.), Computational Models of Conditioning, (pp. 53-70). Cambridge: Cambridge University Press.
  • Harris, J. (2006). Psychophysical investigations into cortical encoding of vibrotactile stimuli. In R. Romo and M. E. Diamond (Eds.), Percept, decision, action: bridging the gaps, (pp. 238-245). Chichester: John Wiley & Sons.
  • Diamond, M., Harris, J., Peterson, R. (2002). Sensory learning and the brain's body map. In Randall J. Nelson (Eds.), The Somatosensory System: Deciphering the Brain's Own Body Image, (pp. 183-195). United States: CRC Press.

Journals

  • Harris, J., Patterson, A., Andrew, B., Kwok, D., Loy, I. (2016). Asymmetry Between Excitatory and Inhibitory Learning. Journal of Experimental Psychology: Animal Learning and Cognition, 42(4), 297-312. [More Information]
  • Thorwart, A., Uengoer, M., Livesey, E., Harris, J. (2016). Summation effects in human learning: evidence from patterning discriminations in goal-tracking. The Quarterly Journal of Experimental Psychology, in press. [More Information]
  • Kwok, D., Harris, J., Boakes, R. (2016). Timing of interfering events in one-trial serial overshadowing of a taste aversion. Learning and Behavior, in press. [More Information]
  • Forrest, D., Mather, M., Harris, J. (2016). Unmasking latent inhibition in humans. The Quarterly Journal of Experimental Psychology, in press. [More Information]
  • Harris, J. (2015). Changes in the distribution of response rates across the CS-US interval: Evidence that responding switches between two distinct states. Journal of Experimental Psychology: Animal Learning and Cognition, 41(3), 217-231. [More Information]
  • Abrahamyan, A., Clifford, C., Arabzadeh, E., Harris, J. (2015). Low Intensity TMS Enhances Perception of Visual Stimuli. Brain Stimulation, 8, 1175-1182. [More Information]
  • Harris, J., Patterson, A., Gharaei, S. (2015). Pavlovian conditioning and cumulative reinforcement rate. Journal of Experimental Psychology: Animal Learning and Cognition, 41(2), 137-151. [More Information]
  • Boakes, R., Patterson, A., Kendig, M., Harris, J. (2015). Temporal distributions of schedule-induced licks, magazine entries, and lever presses on fixed- and variable-time schedules. Journal of Experimental Psychology: Animal Learning and Cognition, 41(1), 52-68. [More Information]
  • Lee Cheong Lem, A., Harris, J., Livesey, E. (2015). Testing the limits of the Perruchet Effect in choice response time tasks. Journal of Experimental Psychology: Animal Learning and Cognition, 41(4), 385-394. [More Information]
  • Hart, G., Holmes, N., Harris, J., Westbrook, R. (2014). Benzodiazepine administration prevents the use of error-correction mechanisms during fear extinction. Learning and Behavior, 42(4), 383-397. [More Information]
  • Hart, G., Panayi, M., Harris, J., Westbrook, R. (2014). Benzodiazepine treatment can impair or spare extinction, depending on when it is given. Behaviour Research and Therapy, 56(1), 22-29. [More Information]
  • Harris, J., Kwok, D., Andrew, B. (2014). Conditioned Inhibition and Reinforcement Rate. Journal of Experimental Psychology: Animal Learning and Cognition, 40(3), 335-354. [More Information]
  • Arabzadeh, E., Clifford, C., Harris, J., Mahns, D., Macefield, V., Birznieks, I. (2014). Single tactile afferents outperform human subjects in a vibrotactile intensity discrimination task. Journal of Neurophysiology, 112(10), 2382-2387. [More Information]
  • Lloyd, D., Abrahamyan, A., Harris, J. (2013). Brain-Stimulation Induced Blindsight: Unconscious Vision or Response Bias? PloS One, 8(12), 1-16. [More Information]
  • Harris, J., Andrew, B., Kwok, D. (2013). Magazine Approach During a Signal for Food Depends on Pavlovian, Not Instrumental, Conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 39(2), 107-116. [More Information]
  • Miniussi, C., Harris, J., Ruzzoli, M. (2013). Modelling non-invasive brain stimulation in cognitive neuroscience. Neuroscience and Biobehavioral Reviews, 37(8), 1702-1712. [More Information]
  • Karim, M., Harris, J., Langdon, A., Breakspear, M. (2013). The influence of prior experience and expected timing on vibrotactile discrimination. Frontiers in Neuroscience, 7, 1-11. [More Information]
  • Wong, C., Harris, J., Gallate, J. (2012). Evidence for a social function of the anterior temporal lobes: Low frequency rTMS reduces implicit gender stereotypes. Social Neuroscience, 7, 90-104. [More Information]
  • Thorwart, A., Livesey, E., Harris, J. (2012). Normalisation between stimulus elements in a model of Pavlovian conditioning: Showjumping on an elemental horse. Learning and Behavior, 40, 334-346. [More Information]
  • Karim, M., Harris, J., Morley, J., Breakspear, M. (2012). Prior and present evidence: How prior experience interacts with present information in a perceptual decision making task. PloS One, 7(5), 1-14. [More Information]
  • Harris, J., Andrew, B., Livesey, E. (2012). The content of compound conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 38(2), 157-166. [More Information]
  • Colagiuri, B., Livesey, E., Harris, J. (2011). Can expectancies produce placebo effects for implicit learning? Psychonomic Bulletin and Review, 18(3), 399-405. [More Information]
  • Livesey, E., Thorwart, A., De Fina, N., Harris, J. (2011). Comparing learned predictiveness effects within and across compound discriminations. Journal of Experimental Psychology: Animal Behavior Processes, 37(4), 446-465. [More Information]
  • Livesey, E., Thorwart, A., Harris, J. (2011). Comparing positive and negative patterning in human learning. The Quarterly Journal of Experimental Psychology, 64(12), 2316-2333. [More Information]
  • Abrahamyan, A., Clifford, C., Arabzadeh, E., Harris, J. (2011). Improving visual sensitivity with subthreshold Transcranial Magnetic Stimulation. The Journal of Neuroscience, 31(9), 3290-3294. [More Information]
  • Abrahamyan, A., Clifford, C., Ruzzoli, M., Phillips, D., Arabzadeh, E., Harris, J. (2011). Matlab Library to Control Magstim Rapid2 Stimulator and a Method for Accurate and Rapid Estimation of Phosphene Thresholds (REPT). PloS One, 6(7), e22342-1-e22342-8. [More Information]
  • Rosenberg, H., Holmes, N., Harris, J., Westbrook, R. (2011). Pre-exposure enhances recovery of conditioned responding after extinction. Learning and Behavior, 39(3), 212-223. [More Information]
  • Harris, J., Carpenter, J. (2011). Response rate and reinforcement rate in Pavlovian conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 37(4), 375-384. [More Information]
  • Harris, J., Gharaei, S., Pincham, H. (2011). Response Rates Track the History of Reinforcement Times. Journal of Experimental Psychology: Animal Behavior Processes, 37(3), 277-286. [More Information]
  • Andrew, B., Harris, J. (2011). Summation of Reinforcement Rates When Conditioned Stimuli are Presented in Compound. Journal of Experimental Psychology: Animal Behavior Processes, 37(4), 385-393. [More Information]
  • Harris, J. (2011). The Acquisition of Conditioned Responding. Journal of Experimental Psychology: Animal Behavior Processes, 37(2), 151-164. [More Information]
  • Ruzzoli, M., Abrahamyan, A., Clifford, C., Marzi, C., Miniussi, C., Harris, J. (2011). The effect of TMS on visual motion sensitivity: an increase in neural noise or a decrease in signal strength? Journal of Neurophysiology, 106(1), 138-143. [More Information]
  • Zopf, R., Harris, J., Williams, M. (2011). The influence of body-ownership cues on tactile sensitivity. Cognitive Neuroscience, 2(3-4), 147-154. [More Information]
  • Harris, J., Livesey, E. (2010). An attention-modulated associative network. Learning and Behavior, 38(1), 1-26. [More Information]
  • Lak, A., Arabzadeh, E., Harris, J., Diamond, M. (2010). Correlated physiological and perceptual effects of noise in a tactile stimulus. Proceedings of the National Academy of Sciences of the United States of America (PNAS), 107(17), 7981-7986. [More Information]
  • Hart, G., Harris, J., Westbrook, R. (2010). Systemic or intra-amygdala infusion of the benzodiazepine, midazolam, impairs learning, but facilitates re-learning to inhibit fear responses in extinction. Learning and Memory, 17(4), 210-220. [More Information]
  • Dwyer, D., Pincham, H., Thein, T., Harris, J. (2009). A learned flavor preference persists despite the extinction of conditioned hedonic reactions to the cue flavors. Learning and Behavior, 37(4), 305-310. [More Information]
  • Livesey, E., Harris, I., Harris, J. (2009). Attentional changes during implicit learning: Signal validity protects a target stimulus from the attentional blink. Journal of Experimental Psychology: Learning, Memory, and Cognition, 35(2), 408-422. [More Information]
  • Livesey, E., Harris, J. (2009). Is there room for simple links in a propositional mind? (Commentary on Mitchell et al.). Behavioral and Brain Sciences, 32(2), 212-213.
  • Harris, J., Gharaei, S., Moore, C. (2009). Representations of single and compound stimuli in negative and positive patterning. Learning and Behavior, 37(3), 230-245. [More Information]
  • Hart, G., Harris, J., Westbrook, R. (2009). Systemic or intra-amygdala injection of a benzodiazepine (midazolam) impairs extinction but spares re-extinction of conditioned fear responses. Learning and Memory, 16(1), 53-61.
  • Holmes, N., Harris, J. (2009). The loss of latent inhibition across compound conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 35(3), 328-339. [More Information]
  • Clifford, C., Arabzadeh, E., Harris, J. (2008). A good bet to measure awareness? Trends in Cognitive Sciences, 12(6), 210-210.
  • Albertella, L., Harris, J., Boakes, R. (2008). Acquired flavour preferences: Contextual control of adaptation-level effects. The Quarterly Journal of Experimental Psychology, 61(2), 227-231. [More Information]
  • Mitchell, C., Harris, J., Westbrook, R., Griffiths, O. (2008). Changes in cue associability across training in human causal learning. Journal of Experimental Psychology: Animal Behavior Processes, 34(4), 423-436. [More Information]
  • Harris, J., Livesey, E. (2008). Comparing Patterning and biconditional Discriminations in humans. Journal of Experimental Psychology: Animal Behavior Processes, 34(1), 144-154. [More Information]
  • Clifford, C., Arabzadeh, E., Harris, J. (2008). Getting technical about awareness. Trends in Cognitive Sciences, 12(2), 54-58. [More Information]
  • Thein, T., Westbrook, R., Harris, J. (2008). How the Associative Strengths of Stimuli Combine in Compound: Summation and Overshadowing. Journal of Experimental Psychology: Animal Behavior Processes, 34(1), 155-166. [More Information]
  • Harris, J., Livesey, E., Gharaei, S., Westbrook, R. (2008). Negative Patterning Is Easier Than a Biconditional Discrimination. Journal of Experimental Psychology: Animal Behavior Processes, 34(4), 494-500. [More Information]
  • Harris, J., Clifford, C., Miniussi, C. (2008). The functional effect of transcranial magnetic stimulation: signal suppression or neural noise generation? Journal of Cognitive Neuroscience, 20, 734-740. [More Information]
  • Arabzadeh, E., Clifford, C., Harris, J. (2008). Vision Merges with Touch in a Purely Tactile Discrimination. Psychological Science, 19(7), 635-641. [More Information]
  • Livesey, E., Harris, J. (2008). What are flexible representations? Commentary on Melchers, Shanks and Lachnit. Behavioural Processes, 77(3), 437-439. [More Information]
  • Boakes, R., Albertella, L., Harris, J. (2007). Expression of flavor preference depends on type of test and on recent drinking history. Journal of Experimental Psychology: Animal Behavior Processes, 33(3), 327-338.
  • Harris, J., Arabzadeh, E., Moore, C., Clifford, C. (2007). Noninformative vision causes adaptive changes in tactile sensitivity. The Journal of Neuroscience, 27(27), 7136-7140.
  • Harris, J. (2006). Elemental representations of stimuli in associative learning. Psychological Review, 113(3), 584-605.
  • Harris, J., Arabzadeh, E., Fairhall, A., Benito, C., Diamond, M. (2006). Factors affecting frequency discrimination of vibrotactile stimuli: Implication for cortical encoding. PloS One, 1(1), 1-9.
  • Harris, J., Karlov, L., Clifford, C. (2006). Localization of tactile stimuli depends on conscious detection. The Journal of Neuroscience, 26(3), 948-952.
  • Clifford, C., Harris, J. (2005). Contextual modulation outside of awareness. Current Biology, 15(6), 574-578. [More Information]
  • Harris, J., Thein, T. (2005). Interactions Between Conditioned and Unconditioned Flavor Preferences. Journal of Experimental Psychology: Animal Behavior Processes, 31(4), 407-417.
  • Harris, J., Clifford, C., Wallace, J. (2005). The effect of 'non-informative' vision on tactile sensitivity. Perception, 34(Supplement), 81-82.
  • Harris, J., Thein, T., Clifford, C. (2004). Dissociating Detection From Localization Of Tactile Stimuli. The Journal of Neuroscience, 24(14), 3683-3693.
  • Harris, J., Shand, F., Carroll, L., Westbrook, R. (2004). Persistence Of Preference For A Flavor Presented In Simultaneous Compound With Sucrose. Journal of Experimental Psychology: Animal Behavior Processes, 30(3), 177-189.
  • Diamond, M., Petersen, R., Harris, J., Panzeri, S. (2003). Investigations into the organization of information in sensory cortex. Journal of Physiology-Paris, 97(4-6), 529-536.
  • Harris, I., Harris, J., Caine, D. (2002). Mental-rotation deficits following damage to the right basal ganglia. Neuropsychology, 16(4), 524-537.
  • Westbrook, R., Iordanova, M., McNally, G., Richardson, R., Harris, J. (2002). Reinstatement of fear to an extinguished conditioned stimulus: Two roles for context. Journal of Experimental Psychology: Animal Behavior Processes, 28(1), 97-110.
  • Harris, J., Miniussi, C., Harris, I., Diamond, M. (2002). Transient storage of a tactile memory trace in primary somatosensory cortex. The Journal of Neuroscience, 22(19), 8720-8725.
  • Harris, J., Westbrook, R. (2001). Contextual control over the expression of fear in rats conditioned under a benzodiazepine. Psychopharmacology, 156(1), 92-97.
  • Harris, I., Harris, J., Caine, D. (2001). Object orientation agnosia: A failure to find the axis? Journal of Cognitive Neuroscience, 13(6), 800-812.
  • Harris, J., Peterson, R., Diamond, M. (2001). The cortical distribution of sensory memories. Neuron, 30(2), 315-318.
  • Harris, J., Harris, I., Diamond, M. (2001). The topography of tactile learning in humans. The Journal of Neuroscience, 21(3), 1056-1061.
  • Harris, J., Harris, I., Diamond, M. (2001). The topography of tactile working memory. The Journal of Neuroscience, 21(20), 8262-8269.

Reference Works

  • Harris, J. (2010). Clever Hans. In D S Mills, J N Marchant-Forde, P D McGreevy, D B Morton, C J Nicol (Eds.), Encyclopedia of Applied Animal Behaviour and Welfare. (pp. 106-107). Oxford: CABI Publishing.
  • Harris, J. (2010). Types of conditioning. In D S Mills, J N Marchant-Forde, P D McGreevy, D B Morton, C J Nicol (Eds.), Encyclopedia of Applied Animal Behaviour and Welfare. (pp. 124-125). Oxford: CABI Publishing.

2016

  • Harris, J., Patterson, A., Andrew, B., Kwok, D., Loy, I. (2016). Asymmetry Between Excitatory and Inhibitory Learning. Journal of Experimental Psychology: Animal Learning and Cognition, 42(4), 297-312. [More Information]
  • Thorwart, A., Uengoer, M., Livesey, E., Harris, J. (2016). Summation effects in human learning: evidence from patterning discriminations in goal-tracking. The Quarterly Journal of Experimental Psychology, in press. [More Information]
  • Kwok, D., Harris, J., Boakes, R. (2016). Timing of interfering events in one-trial serial overshadowing of a taste aversion. Learning and Behavior, in press. [More Information]
  • Forrest, D., Mather, M., Harris, J. (2016). Unmasking latent inhibition in humans. The Quarterly Journal of Experimental Psychology, in press. [More Information]

2015

  • Harris, J. (2015). Changes in the distribution of response rates across the CS-US interval: Evidence that responding switches between two distinct states. Journal of Experimental Psychology: Animal Learning and Cognition, 41(3), 217-231. [More Information]
  • Abrahamyan, A., Clifford, C., Arabzadeh, E., Harris, J. (2015). Low Intensity TMS Enhances Perception of Visual Stimuli. Brain Stimulation, 8, 1175-1182. [More Information]
  • Harris, J., Patterson, A., Gharaei, S. (2015). Pavlovian conditioning and cumulative reinforcement rate. Journal of Experimental Psychology: Animal Learning and Cognition, 41(2), 137-151. [More Information]
  • Boakes, R., Patterson, A., Kendig, M., Harris, J. (2015). Temporal distributions of schedule-induced licks, magazine entries, and lever presses on fixed- and variable-time schedules. Journal of Experimental Psychology: Animal Learning and Cognition, 41(1), 52-68. [More Information]
  • Lee Cheong Lem, A., Harris, J., Livesey, E. (2015). Testing the limits of the Perruchet Effect in choice response time tasks. Journal of Experimental Psychology: Animal Learning and Cognition, 41(4), 385-394. [More Information]

2014

  • Hart, G., Holmes, N., Harris, J., Westbrook, R. (2014). Benzodiazepine administration prevents the use of error-correction mechanisms during fear extinction. Learning and Behavior, 42(4), 383-397. [More Information]
  • Hart, G., Panayi, M., Harris, J., Westbrook, R. (2014). Benzodiazepine treatment can impair or spare extinction, depending on when it is given. Behaviour Research and Therapy, 56(1), 22-29. [More Information]
  • Harris, J., Kwok, D., Andrew, B. (2014). Conditioned Inhibition and Reinforcement Rate. Journal of Experimental Psychology: Animal Learning and Cognition, 40(3), 335-354. [More Information]
  • Arabzadeh, E., Clifford, C., Harris, J., Mahns, D., Macefield, V., Birznieks, I. (2014). Single tactile afferents outperform human subjects in a vibrotactile intensity discrimination task. Journal of Neurophysiology, 112(10), 2382-2387. [More Information]

2013

  • Lloyd, D., Abrahamyan, A., Harris, J. (2013). Brain-Stimulation Induced Blindsight: Unconscious Vision or Response Bias? PloS One, 8(12), 1-16. [More Information]
  • Harris, J., Andrew, B., Kwok, D. (2013). Magazine Approach During a Signal for Food Depends on Pavlovian, Not Instrumental, Conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 39(2), 107-116. [More Information]
  • Miniussi, C., Harris, J., Ruzzoli, M. (2013). Modelling non-invasive brain stimulation in cognitive neuroscience. Neuroscience and Biobehavioral Reviews, 37(8), 1702-1712. [More Information]
  • Karim, M., Harris, J., Langdon, A., Breakspear, M. (2013). The influence of prior experience and expected timing on vibrotactile discrimination. Frontiers in Neuroscience, 7, 1-11. [More Information]

2012

  • Wong, C., Harris, J., Gallate, J. (2012). Evidence for a social function of the anterior temporal lobes: Low frequency rTMS reduces implicit gender stereotypes. Social Neuroscience, 7, 90-104. [More Information]
  • Thorwart, A., Livesey, E., Harris, J. (2012). Normalisation between stimulus elements in a model of Pavlovian conditioning: Showjumping on an elemental horse. Learning and Behavior, 40, 334-346. [More Information]
  • Karim, M., Harris, J., Morley, J., Breakspear, M. (2012). Prior and present evidence: How prior experience interacts with present information in a perceptual decision making task. PloS One, 7(5), 1-14. [More Information]
  • Harris, J., Andrew, B., Livesey, E. (2012). The content of compound conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 38(2), 157-166. [More Information]

2011

  • Colagiuri, B., Livesey, E., Harris, J. (2011). Can expectancies produce placebo effects for implicit learning? Psychonomic Bulletin and Review, 18(3), 399-405. [More Information]
  • Livesey, E., Thorwart, A., De Fina, N., Harris, J. (2011). Comparing learned predictiveness effects within and across compound discriminations. Journal of Experimental Psychology: Animal Behavior Processes, 37(4), 446-465. [More Information]
  • Livesey, E., Thorwart, A., Harris, J. (2011). Comparing positive and negative patterning in human learning. The Quarterly Journal of Experimental Psychology, 64(12), 2316-2333. [More Information]
  • Abrahamyan, A., Clifford, C., Arabzadeh, E., Harris, J. (2011). Improving visual sensitivity with subthreshold Transcranial Magnetic Stimulation. The Journal of Neuroscience, 31(9), 3290-3294. [More Information]
  • Abrahamyan, A., Clifford, C., Ruzzoli, M., Phillips, D., Arabzadeh, E., Harris, J. (2011). Matlab Library to Control Magstim Rapid2 Stimulator and a Method for Accurate and Rapid Estimation of Phosphene Thresholds (REPT). PloS One, 6(7), e22342-1-e22342-8. [More Information]
  • Rosenberg, H., Holmes, N., Harris, J., Westbrook, R. (2011). Pre-exposure enhances recovery of conditioned responding after extinction. Learning and Behavior, 39(3), 212-223. [More Information]
  • Harris, J., Carpenter, J. (2011). Response rate and reinforcement rate in Pavlovian conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 37(4), 375-384. [More Information]
  • Harris, J., Gharaei, S., Pincham, H. (2011). Response Rates Track the History of Reinforcement Times. Journal of Experimental Psychology: Animal Behavior Processes, 37(3), 277-286. [More Information]
  • Andrew, B., Harris, J. (2011). Summation of Reinforcement Rates When Conditioned Stimuli are Presented in Compound. Journal of Experimental Psychology: Animal Behavior Processes, 37(4), 385-393. [More Information]
  • Harris, J. (2011). The Acquisition of Conditioned Responding. Journal of Experimental Psychology: Animal Behavior Processes, 37(2), 151-164. [More Information]
  • Ruzzoli, M., Abrahamyan, A., Clifford, C., Marzi, C., Miniussi, C., Harris, J. (2011). The effect of TMS on visual motion sensitivity: an increase in neural noise or a decrease in signal strength? Journal of Neurophysiology, 106(1), 138-143. [More Information]
  • Zopf, R., Harris, J., Williams, M. (2011). The influence of body-ownership cues on tactile sensitivity. Cognitive Neuroscience, 2(3-4), 147-154. [More Information]

2010

  • Harris, J., Livesey, E. (2010). An attention-modulated associative network. Learning and Behavior, 38(1), 1-26. [More Information]
  • Harris, J. (2010). Clever Hans. In D S Mills, J N Marchant-Forde, P D McGreevy, D B Morton, C J Nicol (Eds.), Encyclopedia of Applied Animal Behaviour and Welfare. (pp. 106-107). Oxford: CABI Publishing.
  • Lak, A., Arabzadeh, E., Harris, J., Diamond, M. (2010). Correlated physiological and perceptual effects of noise in a tactile stimulus. Proceedings of the National Academy of Sciences of the United States of America (PNAS), 107(17), 7981-7986. [More Information]
  • Holmes, N., Harris, J. (2010). Latent inhibition. In Chris J. Mitchell, Mike E. Le Pelley (Eds.), Attention and Associative Learning From Brain to Behaviour, (pp. 99-130). Oxford: Oxford University Press.
  • Clifford, C., Arabzadeh, E., Harris, J. (2010). Operating characteristics and awareness. In Elaine Perry, Daniel Collerton, Fiona LeBeau, Heather Ashton (Eds.), New Horizons in the Neuroscience of Consciousness, (pp. 103-111). Amsterdam: John Benjamins Publishing Company.
  • Hart, G., Harris, J., Westbrook, R. (2010). Systemic or intra-amygdala infusion of the benzodiazepine, midazolam, impairs learning, but facilitates re-learning to inhibit fear responses in extinction. Learning and Memory, 17(4), 210-220. [More Information]
  • Harris, J. (2010). The arguments of associations. In Nestor Schmajuk (Eds.), Computational Models of Conditioning, (pp. 53-70). Cambridge: Cambridge University Press.
  • Harris, J. (2010). Types of conditioning. In D S Mills, J N Marchant-Forde, P D McGreevy, D B Morton, C J Nicol (Eds.), Encyclopedia of Applied Animal Behaviour and Welfare. (pp. 124-125). Oxford: CABI Publishing.

2009

  • Dwyer, D., Pincham, H., Thein, T., Harris, J. (2009). A learned flavor preference persists despite the extinction of conditioned hedonic reactions to the cue flavors. Learning and Behavior, 37(4), 305-310. [More Information]
  • Livesey, E., Harris, I., Harris, J. (2009). Attentional changes during implicit learning: Signal validity protects a target stimulus from the attentional blink. Journal of Experimental Psychology: Learning, Memory, and Cognition, 35(2), 408-422. [More Information]
  • Livesey, E., Harris, J. (2009). Is there room for simple links in a propositional mind? (Commentary on Mitchell et al.). Behavioral and Brain Sciences, 32(2), 212-213.
  • Harris, J., Gharaei, S., Moore, C. (2009). Representations of single and compound stimuli in negative and positive patterning. Learning and Behavior, 37(3), 230-245. [More Information]
  • Hart, G., Harris, J., Westbrook, R. (2009). Systemic or intra-amygdala injection of a benzodiazepine (midazolam) impairs extinction but spares re-extinction of conditioned fear responses. Learning and Memory, 16(1), 53-61.
  • Holmes, N., Harris, J. (2009). The loss of latent inhibition across compound conditioning. Journal of Experimental Psychology: Animal Behavior Processes, 35(3), 328-339. [More Information]

2008

  • Clifford, C., Arabzadeh, E., Harris, J. (2008). A good bet to measure awareness? Trends in Cognitive Sciences, 12(6), 210-210.
  • Albertella, L., Harris, J., Boakes, R. (2008). Acquired flavour preferences: Contextual control of adaptation-level effects. The Quarterly Journal of Experimental Psychology, 61(2), 227-231. [More Information]
  • Mitchell, C., Harris, J., Westbrook, R., Griffiths, O. (2008). Changes in cue associability across training in human causal learning. Journal of Experimental Psychology: Animal Behavior Processes, 34(4), 423-436. [More Information]
  • Harris, J., Livesey, E. (2008). Comparing Patterning and biconditional Discriminations in humans. Journal of Experimental Psychology: Animal Behavior Processes, 34(1), 144-154. [More Information]
  • Clifford, C., Arabzadeh, E., Harris, J. (2008). Getting technical about awareness. Trends in Cognitive Sciences, 12(2), 54-58. [More Information]
  • Thein, T., Westbrook, R., Harris, J. (2008). How the Associative Strengths of Stimuli Combine in Compound: Summation and Overshadowing. Journal of Experimental Psychology: Animal Behavior Processes, 34(1), 155-166. [More Information]
  • Harris, J., Livesey, E., Gharaei, S., Westbrook, R. (2008). Negative Patterning Is Easier Than a Biconditional Discrimination. Journal of Experimental Psychology: Animal Behavior Processes, 34(4), 494-500. [More Information]
  • Harris, J., Clifford, C., Miniussi, C. (2008). The functional effect of transcranial magnetic stimulation: signal suppression or neural noise generation? Journal of Cognitive Neuroscience, 20, 734-740. [More Information]
  • Arabzadeh, E., Clifford, C., Harris, J. (2008). Vision Merges with Touch in a Purely Tactile Discrimination. Psychological Science, 19(7), 635-641. [More Information]
  • Livesey, E., Harris, J. (2008). What are flexible representations? Commentary on Melchers, Shanks and Lachnit. Behavioural Processes, 77(3), 437-439. [More Information]

2007

  • Boakes, R., Albertella, L., Harris, J. (2007). Expression of flavor preference depends on type of test and on recent drinking history. Journal of Experimental Psychology: Animal Behavior Processes, 33(3), 327-338.
  • Harris, J., Arabzadeh, E., Moore, C., Clifford, C. (2007). Noninformative vision causes adaptive changes in tactile sensitivity. The Journal of Neuroscience, 27(27), 7136-7140.

2006

  • Harris, J. (2006). Elemental representations of stimuli in associative learning. Psychological Review, 113(3), 584-605.
  • Harris, J., Arabzadeh, E., Fairhall, A., Benito, C., Diamond, M. (2006). Factors affecting frequency discrimination of vibrotactile stimuli: Implication for cortical encoding. PloS One, 1(1), 1-9.
  • Harris, J., Karlov, L., Clifford, C. (2006). Localization of tactile stimuli depends on conscious detection. The Journal of Neuroscience, 26(3), 948-952.
  • Harris, J. (2006). Psychophysical investigations into cortical encoding of vibrotactile stimuli. In R. Romo and M. E. Diamond (Eds.), Percept, decision, action: bridging the gaps, (pp. 238-245). Chichester: John Wiley & Sons.

2005

  • Clifford, C., Harris, J. (2005). Contextual modulation outside of awareness. Current Biology, 15(6), 574-578. [More Information]
  • Harris, J., Thein, T. (2005). Interactions Between Conditioned and Unconditioned Flavor Preferences. Journal of Experimental Psychology: Animal Behavior Processes, 31(4), 407-417.
  • Harris, J., Clifford, C., Wallace, J. (2005). The effect of 'non-informative' vision on tactile sensitivity. Perception, 34(Supplement), 81-82.

2004

  • Harris, J., Thein, T., Clifford, C. (2004). Dissociating Detection From Localization Of Tactile Stimuli. The Journal of Neuroscience, 24(14), 3683-3693.
  • Harris, J., Shand, F., Carroll, L., Westbrook, R. (2004). Persistence Of Preference For A Flavor Presented In Simultaneous Compound With Sucrose. Journal of Experimental Psychology: Animal Behavior Processes, 30(3), 177-189.

2003

  • Diamond, M., Petersen, R., Harris, J., Panzeri, S. (2003). Investigations into the organization of information in sensory cortex. Journal of Physiology-Paris, 97(4-6), 529-536.

2002

  • Harris, I., Harris, J., Caine, D. (2002). Mental-rotation deficits following damage to the right basal ganglia. Neuropsychology, 16(4), 524-537.
  • Westbrook, R., Iordanova, M., McNally, G., Richardson, R., Harris, J. (2002). Reinstatement of fear to an extinguished conditioned stimulus: Two roles for context. Journal of Experimental Psychology: Animal Behavior Processes, 28(1), 97-110.
  • Diamond, M., Harris, J., Peterson, R. (2002). Sensory learning and the brain's body map. In Randall J. Nelson (Eds.), The Somatosensory System: Deciphering the Brain's Own Body Image, (pp. 183-195). United States: CRC Press.
  • Harris, J., Miniussi, C., Harris, I., Diamond, M. (2002). Transient storage of a tactile memory trace in primary somatosensory cortex. The Journal of Neuroscience, 22(19), 8720-8725.

2001

  • Harris, J., Westbrook, R. (2001). Contextual control over the expression of fear in rats conditioned under a benzodiazepine. Psychopharmacology, 156(1), 92-97.
  • Harris, I., Harris, J., Caine, D. (2001). Object orientation agnosia: A failure to find the axis? Journal of Cognitive Neuroscience, 13(6), 800-812.
  • Harris, J., Peterson, R., Diamond, M. (2001). The cortical distribution of sensory memories. Neuron, 30(2), 315-318.
  • Harris, J., Harris, I., Diamond, M. (2001). The topography of tactile learning in humans. The Journal of Neuroscience, 21(3), 1056-1061.
  • Harris, J., Harris, I., Diamond, M. (2001). The topography of tactile working memory. The Journal of Neuroscience, 21(20), 8262-8269.

To update your profile click here. For support on your academic profile contact .