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Investigation of sensory system (3).docx

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Gautam Ullal

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September 24 , 2012 Psych 2E03: Sensory Processes Investigating the Sensory System (3) Covert Sensory Processes - patients with capgras delusion may even misinterpret their own face, their personal belongings etc. as of someone else “imposter” Cover sensory responses galvanic skin responses: principle and application - record skin-conductance (determined by sweatiness) - as parameter of emotional responsiveness while presenting faces - what happens to these ‘covert signs’ in Capgras agnosia and in prosopagnosia: they are oiir or absent in Capgras. Normal in prosopagnosics Capgras delusion - “not my wife” “that’s an imposter” - delusion about the face of significant person or even ones own face - “that is my wide’s duplicate” “they are duplicates, triplicates…of my children. But not my children” - common with schizophrenia - “that is a duplicate of my house. But not my house”: going through back door - occasionally following traumatic head injury involving the parietal and frontal lobes of cerebral cortex - can be permanent or temporary: reason why they may come back to normal is because the brain makes ajustments to the other sensory stimuli it is receiving Capgras patients show reduced skin conductance response to faces - greater ratio in normal controls and psychiatric controls - capgras patients don’t have significant differences between familiar and unfamiliar faces Covert and overt responses in prosopagnosia and capgras - two routes to face perception and visual recognition: overt (conscious) process and covert (unconscious) process (quicker response than overt process) - visual input>visual cortex>covert/overt>limbic system - in prosopagnosia the overt processes are defective - in Capgras the covert processes are defective Capgras delusion and prosopagnosia compared Conscious recognition of Covert recognition of faces face Prosopagnosia Poor Normal capgras substitution poor - why do we substitute: not me but i
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