Exam 2 Outline - PSYC 329 Exam 2 1. Against Popular Belief...

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PSYC 329 Exam 2 1. Against Popular Belief That We Only Use 10% of Our Brains: A. Specificity Theory : stimuli are represented by one or a few neurons that respond only to those stimuli there must be ample unused neurons to devote to coding newly learned information hence, estimates that we use only a small percent of our brains but we can continue to learn new things throughout our lives B. Distribution Coding : stimuli are represented by the pattern of firing of across a number of neurons more efficient, more economical- a number of neurons can be used to signal a large number of objects individual neurons are activated by many stimuli. NOT just by one specific stimuli even if a neuron participates in one representation it can participate in others Thus, we do not use only 10% of our brains C. fMRI: Based on the measurement of blood flow. This data is flawed since presenting a magnetic field to the brain causes the hemoglobin molecules to line up like tiny magnets leading to the belief that only one portion of the brain is active in a task. ~ Functional Specialization/ Modularity : regions of extrastriate cortex are specialized for particular visual functions V4= color MT= motion IT= shape/form FFA= face perception *Although some specific cortical areas respond best to specific types of stimuli, the overall activity due to the stimulation is more widespread across the cortex 2. Modularity and the Binding Problem: 1
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-Functional Specialization/ Modularity : regions of extrastriate cortex are specialized for particular visual functions V4= color MT= motion IT= shape/form FFA= face perception -Grandmother cells suggests specificity code for sensory information -Binding: the process by which features are combined to create our perception of a coherent object ~necessary since separated areas of the brain are specialized for perception of different qualities - Binding Problem: How do we combine all of these physically separate neural signals to achieve a unified perception of the object? -
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Exam 2 Outline - PSYC 329 Exam 2 1. Against Popular Belief...

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