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L12-Encoding Information

L12-Encoding Information - Sensory Processes Perception PSY...

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    Sensory Processes & Perception PSY 343 Fall Session 2007 - Lecture 12 Encoding Information Instructor:  Sean Green
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    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? 
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    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
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    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?
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    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…
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    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
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    Neural Specialization Specialization for faces in humans
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