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Chapter 6

PSYA01 Chapter 6

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University of Toronto Scarborough
Steve Joordens

Chapter 6 - Perception Perception A rapid, automatic, unconscious process by which we recognize what is represented by the information provided by our sense organs. Brain Mechanisms of Visual Perception: -2 successste levels of visual association cortex -1 level surrounds the primary visual cortex -2 level in middle of parietal lobe and lower part of temporal lobe. The Primary Visual Cortex: Hubel & Wiesel Mapped visual cortex -Placed microelectrodes on animal brains and presented them visual stimuli -Microelectrodes are small wires with points that detect neuron activity -:K,9Z0800L82,5504:9434:7-7,L3L39LO08.,OO024:O084770.059L;01L0O8 -Modules = 0.5mm*0.7mm, 150 000 neurons each -2500 modules in the human brain. -Neurons detected different things (i.e. Some detect horizontal lines, vertical lines, color, etc) Receptive Field The portion of the visual field in which the presentation of visual stimuli will produce an alteration in the firing rate of a particular neuron. The Visual Association Cortex: -Different areas of the visual association cortex deal with different levels of vision. -From the neurons that detect different things -> send info to particular areas of the visual association cortex to be analyzed. Effects of Brain Damage On Visual Perception -If the primary visual cortex is damaged, the person is blind in that area (remember how what we see is mapped on the brain) -No difficulty in perceiving -Damage to visual association cortex damages perceptive ability. Achromatopsia The inability to discriminate among different hues; caused by damage to the visual association cortex. -The brain is contralateral damage to one side affects the other side of body Damage to the achromatopsia causes the person to see no color what so ever. ,OL398$37420A syndrome caused by bilateral damage to the parieto-occipital region of the brain; includes difficulty in perceiving the location of objects and reaching for them under visual guidance. -They can tell that an object has changed positions, but cannot detect movement. www.notesolution.com
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