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Psychology (9,695)
PSYA01H3 (1,206)
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Chapter 6

Chapter 6 - Perception

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Steve Joordens

Chapter 6 Perception Brain Mechanisms of Visual Perception - Perception: Rapid, unconscious process where we recognize what is represented by the information provided by sense organs, provides coherence and unity (AFTER SENSATION), not deliberate or effortful to figure out what the meaning something is -Visual perception by brain is a hierarchysystem of information processing 1) Primary Visual Cortex: Earliest stage of visual analysis was in thalamus and primary visual cortex David Hubel and Torsten Wisel inserted microelectrodes into cats and monkey to detect action potentials by neurons, they were electronically amplified and recorded, they concluded that the geography of the visual field is in the PRIMARY VISUAL CORTEX - The map is like a mosaic (picture of individual tiles, moduletile = block or cortical tissue that receives information from the same group of receptor cells) Receptive Field: Part of visual field where presenting visual stimuli will produce alternation in firing rate of particular neuron 2) Visual Association Cortex: Place where the perception of objects and the visual scene place in combination with P.V.C - Information is further analyzed by V.A.C, as stated by Grill-Spector and Malach), more complex features are analyzed within a bit of milliseconds - Neurons in P.V.C send axons to V.A.C which divides to A) Ventral Stream: Continues to inferior temporal cortex, SERVES TO RECOGNIZE WHAT OBJECT IT IS (FORM AND COLOUR) - Studies with lab animals state that patterns and 3-D perception takes place here - Visual Agnosia (Visual Fail to Know): Inability for person who is not blind to recognize the identity of object visuality, common symptom is Progagnosia (Face): Form of visual agnosia characterized by difficulty in the recognition of peoples faces - Studies show that face-recognizing circuits in fusiform face area (FFA): Region of ventral stream) - Suggests that these circuits develop due to experience seeing peoples faces - Functional Imaging Studies show that different regions in the ventral system respond differently to particular categories of visual stimuli (i.e. extrastriate body area (BBA) is www.notesolution.com
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