PSYCH 15 Lecture Notes - Lecture 8: Superior Colliculus, Oval Window, Fourier Analysis
Document Summary
10/18/16: lecture 8: the visual system + nonvisual senses. Lgn cells are center-surround: stimulated by light in one portion, inhibited by light in the other. There is a small base firing rate. Cancels out when light hits both (base firing rate) Inhibited (does not fire) when light hits the off region--firing rate becomes 0. Lgn cells are circular--direction/orientation of light does not matter. Simple: elongated with on/off regions (for every orientation) Complex: elongated, larger receptive fields, responds to a certain angle/orientation of light anywhere in its receptive field. Motion sensitive (some only fire if stimuli are moving in a certain direction) All neurons in a column have receptive fields in the same general area of visual field. Prefer straight-line stimuli in the same orientation. Horizontally, position of receptive fields shifts systematically. Young-helmholtz trichromatic (3-color) theory: 3 types of color receptor cones: red, green, blue. The colors we perceive are created by light waves stimulating combinations of these cones.
