BMS 870 Lecture Notes - Lecture 14: Parallel Computing, Color Vision, Temporal Lobe
24 Dec 2017
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4c receptive fields ~ magno and parvo lgn neurons. Most neurons in layers superficial to 4c are binocular. Receptive fields of retina, lgn, striate cortex layer 4c - optimal response to light the size of center. Neurons outside of 4c and in striate cortex (v1) - elongated bar of light moving across their receptive fields at certain angle + perpendicular angle is inhibitory --> orientation selectivity. Neighbouring cells of v1 neurons also have orientation selectivity. As a microelectrode is advanced radially (perpendicular to the surface) from one layer to the next, the preferred orientation remains the same for all the selective neurons encountered from layer ii down through layer vi. Hubel and wiesel called such a radial column of cells an orientation column. Tangentially (parallel to surface) - preferred orientation shifts. Optical imaging shows there is a mosaic-like pattern of optimal orientations in the striate cortex.
