Many neurological deficits and disease entities involve difficulties in visual space perception and visually guided behavior, and may involve fine manual control and/or gross motor behavior. Central to these losses is the ability to orient and localize things in space relative to oneself )'egocentric visual localization and orientation'). The proposed research will involve experiments aimed at delineating the mechanisms controlling emphasis on the visual perception of elevation, visual perception of orientation within the frontal plane, and the perception of visual pitch. A distinguishing aspect of the approach is the reduction of large visual influences on the perceptions of location and orientation to influences arising from individual straight lines and their combinations. These influences exert effects on both where things are perceived and where pointing and reaching behavior locates them. Considerable success has already been achieved with this approach. In addition, several of the aspects of the program are concerned with influences from other sources on these dimensions, including extraretinal inputs from vestibular, somesthetic, proprioceptive, and command (efference-generating) systems, and with interactions between the influences from these sources and the visual influences on perceptual and manual localization. The proposed work consists of five segments, the first three of which will explore our two theoretical models which (a) explain our recent discoveries of distance-contingent errors in manual pointing, reaching, and height matching for targets that are perceptually mislocalized due to the orientation of individual straight lines in the visual field, and (b) explain our discovery of a one-sided induction function for binocular depth contrast generated by a single inducing line. The fourth segment will measure the temporal development of changes in localization and orientation (dynamics) in the dimension of perceived elevation, and the fifth segment will search for commonalities and differences in the combining rules, gaze dependence, around-the-clock orientation functions involved in the mechanisms for controlling the perception of elevation and the perception of orientation in the roll-tilt dimension. As a special case of the last segment we will search for nonlinearities in the rule by which the 'frame' is composed from its line segments.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY010534-08
Application #
6702226
Study Section
Visual Sciences B Study Section (VISB)
Program Officer
Oberdorfer, Michael
Project Start
1995-09-01
Project End
2007-01-31
Budget Start
2004-02-01
Budget End
2007-01-31
Support Year
8
Fiscal Year
2004
Total Cost
$296,401
Indirect Cost
Name
Columbia University (N.Y.)
Department
Psychology
Type
Other Domestic Higher Education
DUNS #
049179401
City
New York
State
NY
Country
United States
Zip Code
10027
Li, Wenxun; Matin, Ethel; Matin, Leonard (2013) Short-lived effects of a visual inducer during egocentric space perception and manual behavior. Atten Percept Psychophys 75:1012-26
Shavit, Adam Y; Li, Wenxun; Matin, Leonard (2013) Individual differences in perceived elevation and verticality: evidence of a common visual process. Multisens Res 26:205-39
Hudson, Todd E; Matin, Leonard; Li, Wenxun (2008) Binocular spatial induction for the perception of depth does not cross the midline. Proc Natl Acad Sci U S A 105:18006-11
Hudson, Todd E; Li, Wenxun; Matin, Leonard (2006) The field dependence/independence cognitive style does not control the spatial perception of elevation. Percept Psychophys 68:377-92
Li, Wenxun; Matin, Leonard (2005) The rod-and-frame effect: the whole is less than the sum of its parts. Perception 34:699-716
Li, Wenxun; Matin, Leonard (2005) Visually perceived vertical (VPV): induced changes in orientation by 1-line and 2-line roll-tilted and pitched visual fields. Vision Res 45:2037-57
Li, Wenxun; Matin, Leonard (2005) Two wrongs make a right: linear increase of accuracy of visually-guided manual pointing, reaching, and height-matching with increase in hand-to-body distance. Vision Res 45:533-50
Li, W; Dallal, N; Matin, L (2001) Influences of visual pitch and visual yaw on visually perceived eye level (VPEL) and straight ahead (VPSA) for erect and rolled-to-horizontal observers. Vision Res 41:2873-94
Matin, L; Li, W (2001) Neural model for processing the influence of visual orientation on visually perceived eye level (VPEL). Vision Res 41:2845-72
Matin, L; Li, W (2000) Linear combinations of signals from two lines of the same or different orientations. Vision Res 40:517-27

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