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PSYB65H3 (479)
Ted Petit (185)

Chapter Six

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University of Toronto Scarborough
Ted Petit

PSYB65Chapter 6 SENSATION AND PERCEPTION 61 ORGANIZATION OF SENSORY SYSTEMSThree main types of sensory cortex primary secondary and association o Primary Sensory Cortex first part of the cortex that receives info related from the senses through the thalamus most direct access to the info provided by the sensory systems eg eyes sends this info to secondary sensory cortical areas o Secondary Sensory Cortex receives much of its info from the primary sensory cortex within each sensory modality the secondary sensory cortex is highly interconnected and thus it also receives info from other areas of the secondary sensory cortex sends its info to the association cortex o Association Cortex any area of the cortex that receives info from more than one senseSensory systems can be categorized into three organizing principles o Sensory systems are characterized by hierarchical organization o Each level of the organization contains functionally distinct cortical areas o The processing of sensory info occurs in parallel throughout the cortex Hierarchical OrganizationAt the level of the eye there are a large number of very specialized receptors that have one function to transform light into signals that are meaningful in the nervous systemAt the level of the association cortex the job is more complex to integrate info from a number of sensory systems into a perception of the outside worldAs we move from the lowest to the highest level of sensory systems we also see that the neurons change from having simple onoff sensory functions to those that respond optimally to stimuli of greater complexity and specificityThe deficits that arise when the various levels are damaged are informative as to the function of each of the levels Segregation by FunctionWithin each of the three levels of the sensory cortex there are specific areas that are involved in processing specific aspects of the same sensory stimulus cells respond to colour or orientationetc Processing of Information in ParallelInformation is transmitted throughout the sensory system in parallel each level receiving some information from the level immediately below it and some info from the levels below thatWhen information is processed in parallel through multiple pathways info flows through the levels of the sensory system rapidly and decreases the reliance of the system on any one levelof processing
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