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Object selectivity in dorsal visual stream.

Subramanian, Janani (2011) Object selectivity in dorsal visual stream. Master's Thesis, University of Pittsburgh. (Unpublished)

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We scan the visual world by making rapid eye movements (saccades) and serially focusing on objects of interest. Despite abrupt retinal image shifts, we see the world as stable. Remapping contributes to visual stability by updating the internal image with every saccade. Neurons in macaque lateral intraparietal cortex (LIP) and other brain areas update information about salient objects around the time of a saccade. Information about salient objects is transferred from neurons that currently encode their screen locations to other neurons that will encode their locations after the saccade. The depth of information transfer remains to be thoroughly investigated. Area LIP, as part of the dorsal visual stream is regarded as a spatially selective area. Yet there has been increasing evidence that LIP neurons also encode object features.We sought to determine whether LIP remaps shape information. Such insight is required for understanding what information is retained from each glance and how the visual percept is built (transsaccadic perception). First, we presented shapes in the future location of the receptive field around the time of the saccade and tested for shape selectivity during remapping. Second, we presented the same shapes within the receptive field and tested for shape selectivity in the fixation task. Finally, we compared selectivity in the two tasks. We found that LIP neurons automatically encode and remap shape information. Selectivity in the two tasks was comparable. Our results provide critical evidence for the idea that remapping may be a mechanism for transsaccadic perception of features.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee MemberColby, Carol
Committee MemberSimons, Daniel
Committee MemberGandhi, Neeraj
Date: 14 September 2011
Date Type: Completion
Defense Date: 8 August 2011
Approval Date: 14 September 2011
Submission Date: 16 August 2011
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Neuroscience
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: LIP; object selectivity; remapping
Other ID:, etd-08162011-152337
Date Deposited: 10 Nov 2011 19:59
Last Modified: 15 Nov 2016 13:49


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