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High-probability grants
According to our matching algorithm, Scott Stevenson is the likely recipient of the following grants.
Years |
Recipients |
Code |
Title / Keywords |
Matching score |
1987 — 1988 |
Stevenson, Scott |
F32Activity Code Description: To provide postdoctoral research training to individuals to broaden their scientific background and extend their potential for research in specified health-related areas. |
Opponent Processes in Human Stereopsis @ University of California Berkeley |
0.943 |
1989 |
Stevenson, Scott |
F32Activity Code Description: To provide postdoctoral research training to individuals to broaden their scientific background and extend their potential for research in specified health-related areas. |
Psychophysics @ University of California Berkeley |
0.943 |
1994 — 1997 |
Stevenson, Scott |
R01Activity Code Description: To support a discrete, specified, circumscribed project to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. |
Binocular Matching For Horizontal and Vertical Disparity @ University of California Berkeley
This project will compare the binocular mechanisms that process image correspondence information for the control of vergence eye movements, the perception of stereoscopic depth and the maintenance of single vision. The purpose is to attain an integrated understanding of sensory an motor processing of retinal disparity. The knowledge gained will lead eventually to the diagnosis and treatment of binocular visual disorders, and will provide tools for the study of the development of binocular visual function. One series of experiments examines the spatial constraints on binocular matching, using dynamic random dot stereogram stimuli. Proposed psychophysical experiments will compare the range of horizontal and vertical disparities which give rise to stereoscopic depth. Oculomotor experiments will measure the range of horizontal and vertical disparities which give rise to voluntary and involuntary changes in vergence. The comparison of oculomotor and psychophysical results will test the validity of the distinction between voluntary and involuntary vergence and will clarify the degree to which these two types of vergence interact with perceived depth. A second series of experiments examines the sensitivity of binocular matching on the vertical disparity axis, again using dynamic random dot stereogram stimuli, and compares it to the sensitivity of monocular pattern recognition mechanisms which analyze the self-similarity of images. Proposed psychophysical experiments will measure the degree of image self- similarity required to elicit a "Glass pattern" percept for a given amount of image shift. These results will be compared to those of experiments which measure the degree of left and right image similarity required to elicit a dichoptic "Glass pattern" percept for a give amount of image disparity. Subsequent experiments will combine monocular and dichoptic Glass pattern stimuli in order o measure fusion ranges on the vertical disparity axis. Oculomotor experiments will measure the degree of left and right image similarity required to elicit a vergence eye movement int he appropriate direction, as a function of vertical disparity.
|
0.964 |
2001 — 2003 |
Stevenson, Scott [⬀] |
R01Activity Code Description: To support a discrete, specified, circumscribed project to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. |
Binocular Matching and Disparity Vergence.
DESCRIPTION (adapted from applicant's abstract): Proper alignment of the eyes is essential for clear, single vision. Misalignment during early development can lead to amblyopia, a permanent visual impairment. Eye alignment during gaze changes is determined both by the anatomical organization of extraocular muscles and by the coordinated, visually-guided control of those muscles. The detection and correction of alignment errors from binocular comparison of retinal images is referred to as Disparity Vergence, and has both reflexive and voluntary aspects. The reflexive component of disparity vergence corrects horizontal, vertical and cyclotorsional errors of alignment, while voluntary control is restricted to horizontal vergence. This project is concerned with the visual information processing that provides the basis for reflexive disparity vergence, as revealed by vertical vergence responses. Previous work by the Principal Investigator has shown that the vertical vergence controller can extract vertical disparity signals from dynamic random dot stereograms, but that vertical vergence is not influenced by visual attention or subject effort and often occurs without conscious awareness. These movements thus reflect visual processes that are binocular, most probably cortical, but pre-conscious. The experiments in this project provide a way to study processing at an intermediate stage of the visual system. These processes are central to the control of eye alignment, but cannot be studied with conventional psychophysical techniques because they do not necessarily contribute to visual perception. An eye tracking device is used to detect small changes in eye alignment made in response to imposed vertical image misalignment, allowing for measurement of the vergence system's sensitivity to a variety of image parameters. Proposed experiments will determine the role of contrast, spatial and temporal frequency, and visual feature type in the control of reflexive vergence eye movements. Measurements in subjects with abnormal binocularity will follow up on preliminary evidence that reflex vergence is intact in some cases of stereoblindness. Comparison to results from conventional psychophysical sensitivity measures will highlight differences between early (pre-conscious) and later (perceptual) visual processes. The long-term benefit of this research will be improvements in the diagnosis and treatment of binocular visual disorders of eye alignment and depth perception.
|
0.964 |