Area:
probabilistic models, statistical models, psychophysics, motor control, motor planning
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High-probability grants
According to our matching algorithm, Todd E. Hudson is the likely recipient of the following grants.
Years |
Recipients |
Code |
Title / Keywords |
Matching score |
1999 — 2000 |
Hudson, Todd E |
F31Activity Code Description: To provide predoctoral individuals with supervised research training in specified health and health-related areas leading toward the research degree (e.g., Ph.D.). |
Determinants of Monocular Depth Contrast @ Columbia Univ New York Morningside
DESCRIPTION (Adapted from abstract): Many neurological disorders involve the loss of perceptions of spatial abilities, including perceived orientation. Such disorders will often involve deficits in fine motor control involved in manipulating objects in ways appropriate to the spatial constraints imposed by various tasks (e.g., posting a letter). Such deficits are often NOT the result of a loss in binocular stereo vision; that is, they are essentially monocular. The present research is a preliminary attempt to investigate monocular space perception in the pitch dimension. The perception of pitch (inclination about a horizontal axis) will be investigated utilizing a monocular form of Werner's (1937, 1938) "binocular depth contrast" phenomenon. Previously, depth contrast has been investigated as a binocular phenomenon. I have recently found evidence for depth contrast under monocular viewing conditions. The proposed research focuses on three possible bases of the monocular depth contrast (MDC) effect in isolation: (1) Retinal perspective information; (2) Retinal orientation information; (3) Retinal blur information. Further experiments are proposed to examine the relationship of combinations of 'cues'. The first experiment is designed to replicate our previous MDC result under the conditions of the present experiments. Ss will be presented with a test stimulus consisting of 2 luminous test lines in the presence of 2 luminous induction lines, in otherwise complete darkness. The existence of depth contrast will be assessed by the presence of a shift in the physical pitch of the test lines visually perceived as erect (VPE) produced by changes in the pitch of the induction lines. The presence of MDC when the stimulus consists of one test and one induction line (either on the same or opposite sides of the S's median plane) will be used to assess the possibility that the retinal perspective or orientation cue is responsible for MDC. Preliminary results seem to indicate that perspective is not necessary, but retinal orientation in combination with another cue (such as retinal blur) may be responsible for the effect. Comparison of VPE as a function of the physical pitch of the inducing stimulus (under the same conditions as just described to test retinal perspective) with a normally dark-adapted relative to a pilocarpine-induced 'pinhole' pupil will be used to assess the extent to which the gradient of retinal blur produces MDC. Two experiments utilizing the many-to-one mapping of stimulus lines to their retinal projections are proposed to examine the relationship of retinal orientation to the other cue indicated by the preliminary results mentioned above (such as a blur gradient).
|
0.939 |
2000 — 2003 |
Hudson, Todd E |
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. |
Self Generated Coriolis Forces During Reaching
Many neurological disorders involve the loss of spatial abilities. Such disorders will often involve deficits in motor control (e.g., reaching to a target, or posting a letter). It is important to understand how sensory information is utilized for these motor control tasks. W therefore propose to explore how the central nervous system compensates for self generate Coriolis forces during active trunk rotation under altered sensory-motor adaptation as a way to investigate adaptive force control and self- calibration of reaching movement. In addition, we will investigate the use of non-mechanistically supportive touch in stabilizing posture and balance, which is often a primary replacement for visual and vestibular information in patients with vision loss or a non-functional labyrinth. The first experiment will investigate how low systematic displacement of a platform, upon which the subject stands, affects subsequent reaching movements. During adaptation, the platform will systematically rotate (incrementally, to avoid gross disruption of balance and posture) to either reduce the amount of inertial torso rotation by +, or to double the mount of inertial rotation. Subsequent reaching motions (with and without body rotation) will be used to assess the compensation for Coriolis forces by the altered inertial torso rotation/platform relationship. Another experiment will investigate the role of systematic displacement of non- supportive guide provided to the hand during (subsequent) simultaneous turning and reaching movements. During adaptation, the non-supportive platform will be touched lightly by the hand of the observer while turning the trunk left and right. The hand platform will systematically rotate to either attenuate or amplify the amount of relative hand/body rotation. Subsequent reaching motions (with and without body rotation) will be used to assess the compensation for Coriolis forces by the altered inertial hand displacement/platform relationship.
|
0.954 |