CAS PS 222 Study Guide - Parietal Lobe, Receptive Field, Prosopagnosia
2 Apr 2014
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Document Summary
Chapter 1- introduction to perception. Stimuli presented in ascending or descending order until crossover point. Stimuli adjusted until subject can barely detect it. Stimuli of different intensities presented in random order. Chapter 2- introduction to the physiology of perception. The brain: cerebral cortex- machinery of perception higher order functioning, modular organization- specific functions for specific areas. Communication between cells: chemically (neurotransmitters) If enough excitatory transmitters released, then there is an action potential: inhibitory neurotransmitters cause hyperpolarization (become negative). Myopia- cornea or lens bends too much light or eyeball is too long. Hyperopia- eyeball is too short. Cornea accounts for 80% of focusing, while lens accounts for the other 20%. Vision at high light levels. Tri- chromatic- absorb best at short, medium and long wavelengths. Located in peripheral area of retina. Responsible for black and white vision. Vision at low light levels. Achromatic- absorb best at 500 nm. Transduction of light into nerve impulses: retinal absorbs one photon of light.
