GE CLST 73A Lecture Notes - Lecture 20: Temporal Lobe, Two-Streams Hypothesis, Inferior Temporal Gyrus
2 Dec 2016
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Document Summary
V1 (primary visual cortex): necessary for perception & forming mental images. V2 & v4 & inferior temporal lobe: involved in perception of form. V5 (called mt): specialized for motion perception. V2 is adjacent to v1: has similar properties. V2 cells respond to illusory boundaries & perceive complex relations among parts of receptive fields. V4 responds to more complex stimuli & sensitive to color. There are 2 major projections from occipital lobe: dorsal streams. The where pathway, more like a how pathway: ventral streams. Projects to inferior temporal cortex the what pathway involved in identifying objects. Neurons form building blocks of our ability to recognize a wide range of objects. In posterior parietal cortex (dorsal stream), shape is less important but firing increases when object is a target of motion. Dorsal stream informs motor system of perception of objects & is not fooled by context. Deficit in object recognition that can"t be explained by visual or semantic problems.
