SLecture 3 visual perception basics and phenomena

SLecture 3 visual perception basics and phenomena - Lecture...

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Unformatted text preview: Lecture 3: Visual Perception: Basics & Phenomena Perceptual phenomena: Brightness / Darkness induction Color induction Simple & complex contours Motion after-effect Illusory contours Perceptual filling-in Functional principle/concept: Integration of information beyond the local receptive field, in local networks Important anatomical substrates: Horizontal connections/ Feedback connections Brightness induction Darkness induction Neural adaptation: Reduction of neural activity after long exposure to the same stimulus, or repeated exposure to the same stimulus. The Principle of Adaptation time voxel Neural Signal Neurons Stimulus Neural Signal Neurons Stimulus Adaptation time No adaptation Darkness Induction: Neural Basis- + + + + Excitatory neuron pool, discharge during light off (coding darkness) Inhibitory neuron pool, discharge during light on (coding lightness) During darkness induction: Light surround- leads to partial adaptation of excitatory neuron pool- excitatory pool will discharge less Perceptual Result: More darkness is coded. D [Excitatory neuron pool] < [Inhibitory neuron pool] Visual Processing level Neuron types Phenomenon ______________________________________________________ Brightness/ Retina On-/Off-center Darkness induction ganglion cells Visual Processing level Neuron types Phenomenon ______________________________________________________...
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This note was uploaded on 03/20/2008 for the course PSY 259A taught by Professor Sabinekastner during the Spring '08 term at Princeton.

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SLecture 3 visual perception basics and phenomena - Lecture...

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