The human visual system is faced with the computationally difficult problem of recognizing objects despite potentially large changes in image position, scale, viewpoint, and illumination. The ability to maintain 'object constancy' is crucial to our survival, allowing us to perceive and interact with a stable, predictable, and familiar environment. Despite its importance, how the visual system achieves object constancy is largely unknown. We propose a series of behavioral and functional MRI (fMRI) experiments aimed at characterizing the neural mechanisms underlying object recognition during changes in viewing conditions. In the first series of experiments, we aim to characterize neural responses to image transformations including rotation, scale, and position. The second set of experiments will build on the results of the first by assessing the role of attention and expectation on behavioral and neural responses. The final set of experiments will attempt to specify the role of learning and experience in the development of object perceptions and transformation-invariant neural responses. In all of the experiments, we will use a novel fMRI adaptation technique to characterize tuning functions in specified visual areas.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32EY015342-02
Application #
6822601
Study Section
Special Emphasis Panel (ZRG1-F02B (20))
Program Officer
Oberdorfer, Michael
Project Start
2003-09-30
Project End
2005-09-29
Budget Start
2004-09-30
Budget End
2005-09-29
Support Year
2
Fiscal Year
2004
Total Cost
$47,296
Indirect Cost
Name
University of Minnesota Twin Cities
Department
Psychology
Type
Schools of Arts and Sciences
DUNS #
555917996
City
Minneapolis
State
MN
Country
United States
Zip Code
55455
Murray, Scott O; Boyaci, Huseyin; Kersten, Daniel (2006) The representation of perceived angular size in human primary visual cortex. Nat Neurosci 9:429-34
Murray, Scott O; Olman, Cheryl A; Kersten, Daniel (2006) Spatially specific FMRI repetition effects in human visual cortex. J Neurophysiol 95:2439-45
Murray, Scott O; He, Sheng (2006) Contrast invariance in the human lateral occipital complex depends on attention. Curr Biol 16:606-11
Murray, Scott O; Schrater, Paul; Kersten, Daniel (2004) Perceptual grouping and the interactions between visual cortical areas. Neural Netw 17:695-705