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PSYA01H3 (1,192)
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Chapter 7

Chapter 7 Notes

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University of Toronto Scarborough

Perception Primary function of senses is to guide behaviour perception a rapid, automatic, unconscious process by which we recognize what is represented by information provided by our sense organs if we seesomething ambigious and must figure out what it is, it is problem solving, not perception Brain Mechanisms of Visual Perception perception takes place in brain optic nerve sends signals to thalamus, which relays information to primary visual cortex (located in occipital lobe), neurons in primary visual cortex send visual information to two successive levels of visual association cortex first level located in occipital lobe, surrounds primary visual cortex second level divided into 2 parts, one is middle of parietal lobe and one in lower part of temporal lobe often described as hierarchy of information processing circuits of neurons analyze particular aspects of visual information and send results of analysis to another circuit, which performs further analysis at each step successively more complex features are analyzed and higher levels interact with memories Primary Visual Cortex knowledge of early stages of visual analysis comes from investigations of activity of individual neurons in thalamus and primary visual cortex David Hubel and Torsten Wiesel inserted microelectrodes into regions of visual system in anasthetized cats and monkeys (unconsious but visual system still active) to detect Aps produced by individual neurons found place in visual field with most response and objects with most response found that surface of retina is mapped on surface of primary visual cortex centre of visual field is largest area 2,500 blocks of tissue .5x.7 mm in size containing 15,000 neurons each, receiving information from same small region of retina, and thus small region of visual field (amount seen through soda straw) neural circuits within module analyzes various characteristics of their own particular field (receptive field) detected presence of lines and signalled orientation of lines, thickness of lines, movement and its direction receptive field that portion of visual field in which presentation of visual stimuli will produce an alteration in firing rate of particular neuron particular neuron responds to particular orientation (50 degrees, etc) Visual Association Cortex first level of visual association cortex contains several subdividions, each of which contain map of visual scene each subdivision receives information from different www.notesolution.com
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