PSYC 3460H Lecture Notes - Lecture 2: Rhodopsin, Photopic Vision, Receptive Field
12 Dec 2016
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Focusing depends on: distance from the eye, shape of cornea and lens, accommodation - ability to change the shape of the lens depending on amount of light/distance. Tapedum lucidum - nocturnal animals - reflection of light, hits receptors twice - gives better night vision. Convergence affects sensitivity: each ganglion cell sums the signal presented to its receptive field, assume that detection threshold for any one ganglion cell is 10 photons (quanta) , fovea vs. periphery. Convergence affects acuity: each ganglion cell sums the signal it receives, the more ganglion cells = the more detail in the target pattern. = cortical receptive field: at each level of the visual pathway, the defining characteristic of a visual neurone is the size, shape, stimulus preferences of it receptive field. The receptive field: a stimulus - for vision light, an alert, anesthetized animal, a microelectrode penetrating the body of a single neural cell, a way to record the activity of the cell.
