PSYC BC 1119y Lecture Notes - Lecture 14: Presbyopia, Strabismus, Visual Cortex
4 Nov 2015
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[-info on nasal retina crosses midline and goes to contralateral side] Visual info goes from occipital lobe to one of 2 streams: dorsal stream and ventral stream. Dorsal/where stream: top of nervous system: vision for movement, location- projects to somatosensory and motor regions. Ventral/what stream: bottom of nervous system: vision for recognition (objects, faces)- projects to temporal lobe and hippocampus. For color vision, we have 3 types of cones (trichromatic vision): S (short) cone- responds to short wavelengths around 420 nm. M (medium) cone- responds to medium wavelengths around 530 nm. L (long) cone- responds to long wavelengths around 560 nm. They are maximally sensitive to these wavelengths but respond to full visual light spectrum. When optic tract projects to thalamus, the cones project to the parvocellular cells in the lateral geniculate nucleus (lgn), while rods project to the magnocellular cells in the lgn.
