PSY-B - Psychology PSY-B 320 Lecture 24: Lecture 24
9 Mar 2017
School
Department
Professor
Document Summary
Imagine recording from a single cell in the visual pathway . Seeing shape: place a straight line positioned at a 45 angle in front of the eye, the cell could respond to this stimulus either by increasing or decreasing its firing rate. Cell could show excitation to one stimulus, inhibition to another stimulus or no reaction at all. In either case, we would conclude that the cell is creating information about the line: cell"s response to a particular stimulus is selective. All receptors connect to the cortex through a sequence of 3 or 4 intervening neurons. Information can be modified at different stages in the relay, allowing the sensory system to mediate different responses. Primary visual cortex: parietal cortex, temporal cortex. Retinal ganglion cells: respond only to the presence or absence of light in their receptive field, not to shape, concentric circle arrangement. Center and surround (periphery: on-center cells.
