lecture 17 notes - they had already done on neurons in the...

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Lecture 17, November 1, 2007 Announcements: Society for Neuroscience meeting: problems with office hours and discussion sessions Important difference between notes and lecture on horizontal cells!!! Please work through, so you understand and can explain to others the deficits illustrated on this slide that come from lesions at various places in the pathway. Axons from the neurons in the LGN ascend to the cortex. Their major termination is a region of the brain recognized by Brodmann and named area 17 in the occipital cortex. Brodmann’s areas Layers of cells in the cortex However, this piece of cortex also goes by other names. These include: primary visual cortex, V1, striate cortex. Visual cells within the brain Historical account drawn from the Nobel lecture of David Hubel. In this lecture Hubel describes his and Wiesel’s experiments on cat visual cortex. He describes the terrible difficulty they had in activating cells in the cortex with the same spots of light and dark that had been effective for Kuffler in the case of retinal ganglion cells and some work
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Unformatted text preview: they had already done on neurons in the lateral geniculate nucleus. He describes how they (accidentally!) discovered that the visual cells want to see line segments. The types of neurons they found in the cortex: Simple cells respond to a line of light or dark of a particular orientation in a particular position in the receptive field Complex cells respond to a line of light or dark of a particular orientation in any position within the receptive field End-inhibition complex cells Consider how a simple cell could be constructed by connecting to a single neuron the axons of lgn cells that have their on-off receptive fields arrayed across the retina along a line of a particular orientation. Consider how a complex cell could be constructed by connecting a set of simple cells to a single neuron Summary of cells in the brain The “binding” problem and the “grandmother cell” hypothesis The wondrous organization of the visual cortex....
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