PSYCH 2E03 Lecture Notes - Lecture 23: Amacrine Cell, Retinal Ganglion Cell, Receptive Field
19 Nov 2016
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Psych 2e03 lecture 23 receptive fields. Rods are only active at limited light levels; above this level, photopigment cannot be activated anymore bleaching: upper limit of scotopic vision, cones become active. Rods are more efficient than cones at converting photon absorption to neural signals thus rods and not cones, are active at low light levels: rods have lower absolute threshold. Rods fall into scotopic while cones are responsible for photopic. Some overlap where rods and cones can be active at the same time, but mostly they are separate visual processes. Dark adaptation experiment: determine the detection threshold for a small spot of light at various intervals after bleaching: having rods or cones bleached and having participants detect light for a small amount of light in the dark. Psychophysical measures correlate closely to the actual regeneration of pigment by rhodopsin after bleaching in rods and cones. Can plot this (detection threshold vs dark adaptation in minutes)
