Cognition - Psy361 : perception and brain 09/27/05 1 Brain...

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Unformatted text preview: Psy361 : perception and brain 09/27/05 1 Brain and Visual Perception Brain and Visual Perception Early ideas about the brain 1842 Johannes Mueller, a German physiologist, proposed the doctrine of specific nerve energies, which stated that our perceptions depend on nerve energies reaching the brain and the specific quality we experience depends on which nerves are stimulated. Psy361 : perception and brain 09/27/05 2 Visual pathways from the eyes to the brain A point in the right hemi-field is projected onto the left-sides of both eyes or the left side of the right eye only. Right Hemi-field Left Hemi-field Axons exiting the left side of the right eye cross over at optic chiasm to the right side of the brain Signals from the left sides of both eyes reach the left side of the brain----first LGN and then V1. Left V1 Right V1 Retinotopic mapping: 1. Left-Right reversal 2. Up-down reversal 3. Cortical magnification: Retinal locations closer to the fovea are represented more at V1 Cortical magnification revealed by 2-DG (deoxyglucose) technique: the left panel shows the stimulus display watched for minutes by an experimental animal; the right panel shows the corresponding pattern of neuronal activity by radioactive marks in a slice of V1 tissue from the animal Psy361 : perception and brain 09/27/05 3 Receptive field properties of V1 neurons Orientation selective Simple cell Complex cells End-stop cells Simple cells Complex cells End stop cells aftereffect : Psychophysical evidence for orientation selectivity Psy361 : perception and brain...
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This note was uploaded on 05/25/2011 for the course PSYCHOLOGY 361 taught by Professor Lou during the Spring '10 term at Grand Valley State University.

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Cognition - Psy361 : perception and brain 09/27/05 1 Brain...

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