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PSYCH 2E03 (70)
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Lateral Inhibition & Receptive Fields of Retina.docx

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Department
Psychology
Course
PSYCH 2E03
Professor
Gautam Ullal
Semester
Fall

Description
October 12 , 2012 Psych 2E03: Sensory Processes Lateral Inhibition & Receptive Fields of Retina Nyctalopia = Night blindness - due to Vitamin A deficiency - most common preventable form of blindness - readily treated by administering vitamin A - prevented by diets containing high source of vitamin A Lateral Inhibition in the Limulus ( horseshoe-crab) - each eye of a Limulus has hundreds of ommatidia - each ommatidium has a cornea, lens and single receptor - the ommatitidia are quite large and can be individually illuminated - the receptor-activity can be conveniently studied individually Lateral inhibition - inhibition that is transmitted laterally across a neural circuit - recording the activity in A:  stimulating A alone  stimulating A + B  stimulating A + B with increased B - in the vertebrate-retina lateral inhibition is caused by horizontal cells and amacrine cells Lateral inhibition and mach band - the areas adjacent to the borders between the bands appear fainter/darker - physical intensity distribution of light across A, B, C and D regions - perceived intensity of light across A, B, C and D regions Reti
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