PSYC 102 Lecture Notes - Lecture 4: Lateral Geniculate Nucleus, Visual Cortex, Occipital Lobe
9 Apr 2016
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Document Summary
Receptive fields: receptive field: region of the sensory surface that, when stimulated, causes a change in the firing rate of that neuron. On-center cells, off-center cells: a given rgc will respond to light falling anywhere within a small patch (receptive field). The visual brain: streams of action potentials containing information encoded by the retina travel to the brain (along the optic nerve) for further processing. Lateral geniculate nucleus (lgn), v1: part of the occipital lobe that contains the primary visual cortex: feature detectors in v1. The visual brain: two distinct pathways, or visual streams, project from the occipital cortex to visual areas in other parts of the brain. Ventral stream ( what is it ) to temporal lobe. Dorsal stream ( where is it ) to the parietal lobe: evidence of two distinct streams comes from brain damage cases. Visual-form agnosia: the inability to recognize objects by sight. Area v1 contains neurons that respond to specific orientations of edges.
