chapter 6 textbook

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Published on 8 Dec 2010
School
UTSC
Department
Psychology
Course
PSYA01H3
Psychology Chapter 6: 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:
-a viewer can recognize familiar objects and learn appearances of new objects
The Primary Visual Cortex:
-learned from the thalamus and primary visual cortex
-geography of visual field in=s retained here
-Module: block of cortical tissue that receives info from the same group of receptor cells
-Hubel and Wiesel: studied this area
-Receptive Field: portion of the visual field in which the presentation of visual stimuli
will produce an alternation in the firing rate of a particular neuron
The Visual Association Cortex:
-Ventral Stream: flow of info from the primary visual cortex to the visual association
area in the lower temporal lobe; used to form the perception of an objects shape,
colour, and orientation (the “what system)
-Dorsal Stream: flow of info from the primary visual cortex to the visual association
area in the parietal lobe; used to form the perception of an objects location in three-
dimensional space (the wheresystem)
-Visual Agnosia: inability of a person who is not blind to recognize the identity of an
object visually; caused by damage to the visual association cortex
-Prosopagnosia: form of visual agnosia characterized by difficulty in the recognition of
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peoples faces; caused by damage to the visual association cortex
-Fusiform Face Area (FFA): region of the ventral stream of the visual system that
contains face-recognizing circuits
-a disorder that associates with this is autism
-Extrastriate Bosy Area (EBA): region of the occipital cortex, next to the primary
visual cortex, that responds to forms resembling the human body
-Parahippocampal Place Area (PPA): region of the ventral stream, below the
hippocampus, that is activated by visual scenes
-Cerebral Achromatopsia: inability to discriminate among different hues; caused by
damage to the visual association cortex (ex. seeing black and white)
-Akinetopsia: inability to see motion
-perception of movement can help perceive three-dimensional forms (form from motion)
Visual Perception of Objects:
Figure and Ground:
-classify everything as either an object or background
Object: has particular shapes and particular locations in space
Backgrounds: formless and serve mostly to help us judge the location of
objects we see in front of us
-Figure: visual stimulus that is perceived as a self-contained object
-Ground: visual stimulus that is perceived as a formless background against which
objects are seen
Gestalt Laws of Perceptual Organization:
-a branch of psychology that asserts that the perception of objects is produced by
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Document Summary

A rapid, automatic, unconscious process, by which we recognize what is represented by the information provided by our sense organs. A viewer can recognize familiar objects and learn appearances of new objects. Learned from the thalamus and primary visual cortex. Module: block of cortical tissue that receives info from the same group of receptor cells. Receptive field: portion of the visual field in which the presentation of visual stimuli will produce an alternation in the firing rate of a particular neuron. Ventral stream: flow of info from the primary visual cortex to the visual association area in the lower temporal lobe; used to form the perception of an object"s shape, colour, and orientation (the what system) Dorsal stream: flow of info from the primary visual cortex to the visual association area in the parietal lobe; used to form the perception of an object"s location in three- dimensional space (the where system)