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PSYC 100 (329)

Visual Perception

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Queen's University
PSYC 100
Ingrid Johnsrude

Visual Perception  the process by which we recognize what is represented by in the information provided by our sense organs  gives unity and coherence to this input Module –  a block of cortical tissue that receives information from the same group of receptor cells  all the neurons within a module receive information from the same small region of the retina Receptive field – the portion of the visual cortex in which presentation of visual stimuli will produce an alternation in the firing rate of a particular neuron Ventral stream  the flow of information from the primary visual cortex to the visual association area  lower temporal lobe  Used to form the perception of an objects shape, colour, and orientation Dorsal Stream  The flow of information from the primary visual cortex to the visual association area  Parietal lobe  Used to form perception of an objects location in 3 dimensional space  Involved in visual attention and control of eye movements  Reaching, pointing, grasping  Perception of spatial location, perception of movement Visual Agnosia  The inability of a person who is not blind to recognize the identity of an object visually  Caused by damage to the visual association cortex Prospagnosia  A form of visual agnosia  Characterized by the difficult to recognize peoples faces  Caused by damage to the visual association cortex Extrastriate Body Area  Region of the occipital cortex  Responds to forms resembling the human body Parahippocampal Place Area  Region of ventral stream  Activated by visual scenes Cerebral Achromatopsia  The inability to discriminate amoung different hues  Caused by damage to the visual association cortex Akinetopsia – inability to see motion Figure – a visual stimulus that is perceived as a self contained object Ground – a visual stimulus that is perceived as a formless background against which objects are seen Gestalt Laws of perceptual organization - Organize elements and empty spaces into cohesive forms  Law of proximity o Elements located closest to each other are perceived as belonging to the same figure  Law of similarity o States that elements that look similar will be perceived as part of the same form  Good continuation o Two or more interpretations of elements that form the outline of the figure o Simplest interpretation will be preferred  Law of closure o Our visual system often supplies missing information and closes the outline of an incomplete figure  Law of common fate o Elements that move in the same direction will be perceived as belonging together and forming a figure Template  hypothetical pattern that resides in the nervous system  used to perceive objects or shapes by a process of comparison Prototype  Hypothetical idealized pattern that resides in the n
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