GE CLST 73A Lecture Notes - Lecture 20: Prosopagnosia, Agnosia, Fusiform Face Area
23 Feb 2017
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V2 cells respond to illusory boundaries, and perceive complex relations among parts of the receptive fields. V4 responds to more complex stimuli, sensitive to color. High spatial frequency - can see detail. Two major projections: the dorsal and ventral streams. Ventral stream includes v4, projects to inferior temporal cortex. The what pathway - involved in identifying objects. The where pathway, but maybe more like a how pathway. How to interact with something, (interacting with a table to avoid it) Ventral stream - neurons may form building blocks of our ability to recognize a wide range of objects (like letters of an alphabet) In the posterior parietal cortex (dorsal stream), shape is less important, but firing increases when the object is a target of motion. Can respond to shape in some cases. Ex) monkeys need to pick up a banana. Visual motor system is programmed to pick up the object. Dorsal stream is not based on conscious perception.
