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PSYB65H3 (479)
Ted Petit (185)
Chapter 6

Chapter 6: Sensation and Perception

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Ted Petit

Chapter 6 Sensation and Perception Vision Sensation detection of some aspect of a stimulus in the environment Perception way in which our brains interpret information gathered by sensesModule 61 Organization of Sensory SystemsPrimary sensory cortex receives information from senses through thalamus Secondary sensory cortex receives information from primary as well as other areas of secondary sensory cortex and sends information to association cortex Association cortex receives information from more than one sense Principles 1 Sensory systems characterized by hierarchical organizations 2 Each level of the organization contains functionally distinct cortical areas 3 The processing of sensory information occurs in parallel throughout the cortex Hierarchical OrganizationWhere in the hierarchy damage occurs can result in different things y Segregation by Function Within each hierarchical level there is separation based on processing of specific aspects of the same ystimulus ex Colour vs orientation Processing of Information in ParallelEach level receives some information from level above and below so information flows rapidly and ythere is less reliance on any one level Module 62 The Visual System Light Stimulus for the Visual System Light electromagnetic energy 400700nm from something producing it or reflected off something short blue long red The Eye and Retina Retina where light is focused on to by curvature of cornea and fine tuned by lens o Receptor cells convert light to neural responsesRods active in low light sensitive to movement many rodsbipolar cell y Cones active in bright light for high acuity vision with detail and color 1 conebipolar ycell o Horizontal cells lateral communication between cells o Bipolar cells info from receptors send to retinal ganglion cells o Amacrine cells lateral communication o Retinal ganglion cells axons leave retina via optic nerveLight right visual field goes to left side of both eyes and vice versaNasal side of retina close to nose retinal ganglion cells project contralaterally to lateral geniculate nucleus of thalamus Temporal side of retina close to ears project ipsilaterally to LGNLeft and right visual fields therefore sent to opposite sides of brain yRetinoGeniculateStriate System
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