Schedule
Jul 26, 2001
Lateral Inhibition and Excitation in Vision
Dr. Sebastian Seung
http://hebb.mit.edu/people/seung/
The phenomenon of feature selectivity has long been observed in
sensory neurons of the brain, but our understanding of its
mechanisms is still incomplete. In visual areas of the brain,
there has been a debate over the relative importance of
feedforward and recurrent synapses in generating feature
selectivity. This lecture will discuss the classic work of
Hartline and Ratliff on the role that lateral inhibition plays in
shaping the response properties of photoreceptors in the Limulus
retina. This will be followed by an account of competing theories
for the generation of orientation selectivity in primary visual
cortex. These include the Hubel-Wiesel model, according to which
orientation selectivity is due to the spatial configuration of
thalamo-cortical afferents, and other models in which
cortico-cortical interactions play an essential role.
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