Vision laboratory

Lab head: Alan Freeman
Location: Discipline of Biomedical Science, Lidcombe campus

Our research program focusses on signal processing in the mammalian visual system. The main methods used in the laboratory are human psychophysics (recording the responses of human subjects discriminating between visual stimuli) and mathematical modelling.

Website: http://www3.fhs.usyd.edu.au/bio/alan.html
Lab members: Padma Iyer Nastaran Hesam Shariati Munira Al-Dossari

The development of binocular vision

Primary supervisor: Alan Freeman

Most of us can combine the information from our two eyes to obtain a richer view of the world than would be the case with only one eye. While it is easy to take binocular vision for granted, there are many unanswered questions about how it operates.

Many neurons in primary visual cortex can be stimulated through either eye. These binocular cells have one receptive field for left eye stimuli and another receptive field for right eye stimuli. Response properties such as preferred orientation and preferred motion direction differ little between the two receptive fields. This is a remarkable property, given that the two monocular pathways develop, by and large, independently.

How does this binocular congruence come about? The proposed project will explore this question computationally. A mathematical model for signal processing in each of the monocular pathways will be developed. The monocular pathways will be connected to each cortical cell by making two assumptions: that one monocular connection is made before the other, and that a Hebbian process (“cells that fire together wire together”) determines the pattern of connections for the later pathway.

The student undertaking this project should be mathematically competent. Further, a working knowledge of the Matlab software package will provide a flying start.


Discipline: Biomedical Sciences
Keywords: Vision, visual science, Nervous system
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