L12-Encoding Information

L12-Encoding Information - Sensory Processes &...

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Unformatted text preview: Sensory Processes & Perception PSY 343 Fall Session 2007 - Lecture 12 Encoding Information Instructor: Sean Green Introduction We’ve talked about how our visual cortex can represent simple features of a stimulus in hypercolumns Now imagine a more complex stimulus. What is going on in your brain when you recognize your grandmother in a photograph? What happens where in the brain? Modularity vs. Equipotentiality Modularity: The idea that a particular function is performed by a particular brain region Phrenology Wilder Penfield’s experiments Equipotentiality: The idea that all brain regions are equally able to perform a particular function Lashley’s experiments with lesioning dog brains Debate over whether memory, language, etc. are interactive or modular Today we’ll talk about how neurons in IT can be specialized to represent specific things Neural Specialization Neural specialization is the ability of neurons to to selectively fire only when specific stimuli are present and not when others are present Last week, we talked about cells in V1 that responded preferentially to particular types of lines Do we have neurons that respond to specific complex stimuli as well? Neural Specialization Cells that respond selectively to complex patterns Elaborate cells in IT Respond to complex shapes combinations of shape and color An elaborate cell might fire in response to… or by themselves but not… Neural Specialization Types of neurons in IT: Size invariant neurons Location invariant neurons View invariant neurons Size specific neurons Location specific neurons View specific neurons Neural Specialization Specialization for faces in humans The fusiform face area (FFA) responds...
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This note was uploaded on 06/05/2008 for the course PSY 343 taught by Professor Green during the Fall '07 term at SUNY Buffalo.

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L12-Encoding Information - Sensory Processes &...

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