Chater 5B (Sensation & Perception) - Thursday October 22 2009

Chater 5B (Sensation & Perception) - Thursday October 22 2009

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Chapter 5 : Sensation & Perception Thursday October 22, 2009 Review questions: Q1: The receptors at the tip of the tongue are most responsive to chemical substance of A:Sweet Q2: According to the __ of pitch perception, different frequencies stimulate different areas on basilar membrance A:Place theory ______________________________________________________________________ Our tactile senses Touch The stimuli: Mechanical, thermal, or chemical energy applied to the surface of the skin Cells in the nervous system are triggered by some areas on the body’s surface. Centre-surrounded receptive field. o Stimuli at centre have opposite effect of stimuli falling outside of the centre - Primary somatosensory cortex - Somatotopic organization - Sensory homunculus Feeling pain Receptors: free nerve endings in the skin Sharp (brief) (A-delta fiber) vs. Dull (throbbing) (C fiber) 2 different pathways Survival function of pain
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Role of cognition- negative thinking -distraction Gate control theory-spinal cord can block pain signals to the brain Factors effecting pain perception A complex interplay of numerous factors Biological Stimulation of nerve endings Endorphins reduce perception of pain Psychological Pain in the absence of physical cause Personality Beliefs about ability to control pain Placebo effects Cultural/gender differences Cultural learning - Cultural meaning of pain Phantom limb pain
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