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Form Perception- two.doc

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Western University
Psychology 2015A/B
Stephen Lupker

Form Perception -contours/edges: fundamental building block for any visual pattern -area in the array of visual information in which there is an abrupt change in luminance -defines the shape we see and details that distinguish one shape from another Ganzfeld: snow storm, visual system shuts off (all white) -contact lens experiment: eyes are always in motion -contour on retina is always changing position -word hat on contact lens= after a while will disappear -visual system trying to do least amount of work -organization with the lowest figured complexity: more likely seen -structuralist: the way we perceive an object- something already in memory -gestaltists: spend time trying to figure principles to explain how people perceive objects -gestalt laws of perceptual organization: help explain the way in which we organize sounds as well as visual forms or events over time 1) proximity: elements closer to one another tend to be perceived as a unit or figure 2) similarity: similar objects tend to be grouped together 3) law of good continuation: elements appear to follow the same direction (in a straight line or simple curve) tend to be grouped together 4) law of closure: we tend to ignore gaps between elements in order to form a closed figure 5) law of simplicity: we look for the simplest answer 6) law of common fate: elements tend to be perceived or grouped together id they move together *strive for oder *make things as simple as possible: law of Pragnanz Visual masking: -the likelihood of seeing a specific target is reduced if the stimulus is presented where there is another target nearby in both location and time • Forward masking: first stimulus interferes with perception of the second (100ms of less) • Stimulataneous masking: perception is impaired by the presence of an extraneous stimulus presented at the same time • Backward masking: presence of the second stimulus interferes with the perception of the first -Averbach and Coriell (iconic memory) -temporal properties of a visual ST memory buffer -two rows 8 letters B P M R S C T V *C is indicator W Z G J K N D X -report one
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