PSYC 2390 Chapter Notes - Chapter 4: Hemoglobin, Extrastriate Body Area, Inferior Temporal Gyrus
31 Oct 2016
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Chapter 4 the visual cortex and beyond. Most signals from the retina travel out of the eye in the optic nerve to the lateral geniculate nucleus (lgn) in the thalamus. Lgn neurons have the same centre surround configuration as retinal ganglion cells: respond best to small spots of light on the retina, regulate neural info as it flows from the retina to the visual cortex. 90% of the fibres in the optic nerve arrive in the lgn other 10% travel to the superior colliculus -lgn receives info from many sources. Lgn receives more input back from the cortex than it receives from the retina. The smallest signal of all is from the lgn to the cortex for every 10 from the retina, sends 4 to the cortex. Ipsilateral eye layers 2,3, and 5 (red layers) receive signals from here, the eye on the same side of the body as the lgn.
