How does vision specify the objects and events that guide our actions? How does vision interact with other brain systems in this specification? These broad questions motivate the experiments in this proposal. This proposal, the second resubmission of a competitive renewal of the PI's current grant (EY 07760), describes a set of studies using psychophysical methods and novel display techniques to pursue the following research problems: a) perception of shape and figure/ground relations based on edge and contour information specified solely by temporal information; b) influence of auditory signals and environmental context on registration and integration of object/motion information. Specific methods include forced-choice measurement of shape discrimination performance, tracking of periods of dominance and suppression in binocular rivalry accompanied by sound, measurement of direction and/or motion coherence discrimination under conditions where observers are also listening to moving sound sources. Results from these experiments will bear importantly on contemporary theories of feature binding, motion perception and perceptual grouping. In addition, this work broadens the PI's studies to include the role of context on visual perception. It is anticipated that results will point the way to physiological and neural imaging studies of the neural concomitants of visual perception. In addition, the work on spatial structure from temporal synchrony may have implications for understanding clinical disorders involving disruptions in temporal processing, including dyslexia.

National Institute of Health (NIH)
National Eye Institute (NEI)
Research Project (R01)
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Visual Sciences B Study Section (VISB)
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Oberdorfer, Michael
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Vanderbilt University Medical Center
Schools of Arts and Sciences
United States
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Gilroy, Lee A; Hock, Howard S (2009) Simultaneity and sequence in the perception of apparent motion. Atten Percept Psychophys 71:1563-75
Tadin, Duje; Paffen, Chris L E; Blake, Randolph et al. (2008) Contextual modulations of center-surround interactions in motion revealed with the motion aftereffect. J Vis 8:9.1-11
Kim, Jejoong; Blake, Randolph; Park, Sohee et al. (2008) Selective impairment in visual perception of biological motion in obsessive-compulsive disorder. Depress Anxiety 25:E15-25
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Blake, Randolph; Rizzo, Matthew; McEvoy, Sean (2008) Aging and perception of visual form from temporal structure. Psychol Aging 23:181-9
Blake, Randolph; Shiffrar, Maggie (2007) Perception of human motion. Annu Rev Psychol 58:47-73
Guttman, Sharon E; Gilroy, Lee A; Blake, Randolph (2007) Spatial grouping in human vision: temporal structure trumps temporal synchrony. Vision Res 47:219-30
Tadin, Duje; Lappin, Joseph S; Blake, Randolph (2006) Fine temporal properties of center-surround interactions in motion revealed by reverse correlation. J Neurosci 26:2614-22
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Tadin, Duje; Kim, Jejoong; Doop, Mikisha L et al. (2006) Weakened center-surround interactions in visual motion processing in schizophrenia. J Neurosci 26:11403-12

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