University of Sydney School of Psychology  
  Current Students   Future Students   Our Academic Staff   Research   Clinic   Staff Resources   Search  
Paper in Vision Research
  • Colin W.G. Clifford, and Erin Weston (2005). Aftereffect of adaptation to Glass patterns. Vision Research, 45, 1355-1363.

    ABSTRACT

    Our visual systems constantly adapt their representation of the environment to match the prevailing input. Adaptation phenomena provide striking examples of perceptual plasticity and offer valuable insight into the mechanisms of sensory coding. Here, we describe an aftereffect of adaptation to a spatially structured image whereby an unstructured test stimulus takes on illusory structure locally perpendicular to that of the adaptor. Objective measurement of the strength of the aftereffect for different patterns suggests a neural locus of adaptation prior to the extraction of complex form in the visual processing hierarchy, probably at the level of primary visual cortex. This view is supported by further experiments showing that the aftereffect exhibits partial interocular transfer but complete transfer across opposite contrast polarities. However, the aftereffect does show weak position invariance, suggesting that adaptation at higher levels of the visual system may also contribute to the effect.