PSYC 3 Lecture Notes - Lecture 18: Lateral Geniculate Nucleus, Optic Chiasm, Visual System

• School: Irvine Valley College
• Department: Psychology
• Course: PSYC 3
• Professor: mis

Document Summary

Optic nerve travels back and undergoes a partial decussation at optic chiasm. Axons cross (contralateral) and do not (ipsolateral) Axons from nasal of retina cross and temporal axons do not. Optic tract travels back and synapses in the lateral geniculate nucleus of the thalamus (lgn) People with damage to v1 have blindsight. Essentially going from periphery to thalamus to cortex. Deteting detail layers 3,4,5,6 of the lgn. M-cells (magnocellular pathway) larger (magno) and have large receptive fields layers 1 and 2 of the lgn. So you can keep the visual field where right visual field goes to left and vice. Cortical magnification-part of visual world over rep, and part under rep. Dramatic scaling of info from diff parts of visual field. The amount of cortex devoted to processing the fovea is proportionally much more than the amount of cortex devoted to processing the periphery. Over rep the center, under rep the periphery.