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PSYC 2410 (149)


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University of Guelph
PSYC 2410
Elena Choleris

Exteroceptive Sensory Systems 1162012 121100 PM Exteroceptive Sensory Systems start of ch 7Bring information from external environmentSensation process of detecting a stimulus receptorPerception the higher order process of integrating recognizing making sense of sensations and interpreting patternsNormally happen one after the otherCase Example the man who mistook his wife for a hatNormal sense of vision but impairment in perception of visual systemShown gloves and asked to describe leather has 5 pockets what is it something that holds coinsHierarchical OrganizationIncreasing more complex processingReceptorsSpecific to sense different and respond to different stimuliOther structures eg thalamic nucleiReceptors project to other structures sub corticalAll except 1 project to thalamic nuclei olfaction goes straight to cortexStructures are specific to sense as wellCortical ProcessingPrimary sensory cortex o Specific to sensory modality receives most of information directly from thalamic nucleiSecondary sensory cortex o By and large also specific to sense receive info from primary sensory cortexAssociation cortex o Receive input from multiple senses and integrate eg touching and looking at objectHierarchical OrganizationMembers assigned to specific levels or ranks on basis of specificity and complexity of function each level adds layer of analysis before passing it on to higher levels o Higher the level of damage the more specific and complex the deficitFunctional SegregationDifferent brain areas involved in different processes or analysisParallel ProcessingEach level can work at same time as other level so sense can be processed at same time as other senses o Division of labourTwo finds of parallel streams one which influences behaviour without conscious awareness and one that influences behaviour by engaging our conscious awarenessOlder viewserial order one must be completed before the next starts Vision 1162012 121100 PM VisionProduces an internal representation of the outside worldNot always an accurate representation of realityA perception of reality based on specific receptors hardware o Interspecific differences eg snakes can see infrared identify warm blooded animals insects see ultraviolet flowers and pollination o Intraspecific differences eg colour blindnessTop down influence attention individual experience etc can affect perception o Eg same scene viewed differently by people with different interestsPerception of LightLight electromagnetic wave energy that can be represented by discrete unitsparticles of energy called photonsVery fasto Travels at 300000 kmsWavelengthcoloursIntensitybrightness o Eg bright red our perception of high intensity of 700nm wavelength lightVisible light waves for humans is 380700nm 109 mRattlesnakes can see infraredParts of the Eye Sclerahard in GreekIrisColoured part of eyeContractile tissue regulates the size of the pupil in response to light
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