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SLecture 3 visual perception basics and phenomena

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

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Lecture 3: Visual Perception: Basics & Phenomena
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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
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Brightness induction Darkness induction
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Neural adaptation: Reduction of neural activity after long exposure to the same stimulus, … … or repeated exposure to the same stimulus.
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The Principle of Adaptation time voxel Neural Signal Neurons Stimulus Neural Signal Neurons Stimulus Adaptation time No adaptation
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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]
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Visual Processing level Neuron types Phenomenon ______________________________________________________ Brightness/ Retina On-/Off-center Darkness induction ganglion cells
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Visual Processing level Neuron types Phenomenon ______________________________________________________
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