Adaptation to prismatic displacement as a function of target distance and direction of turn.. by Anne Jeannine Winter

Cover of: Adaptation to prismatic displacement as a function of target distance and direction of turn.. | Anne Jeannine Winter

Published in [Iowa City] .

Written in English

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  • Space perception

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Series[Oregon. University. School of Health, Physical Education, and Recreation. Microform publications]
The Physical Object
Paginationv, 45 l.
Number of Pages45
ID Numbers
Open LibraryOL16645759M

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Get this from a library. Adaptation to prismatic displacement as a function of target distance and direction of turn. [Anne J Winter]. Adaptation to displacement of objects in the visual field was studied as a function of preexposure test targets being absent or present in that field and lateral arm movement requiring no pointing Author: Benjamin Wallace.

During the primary saccade to a target letter string, displayed at 2°30 from the fixation point, the target letter string was displaced by 1 or 2 character-spaces, in the same direction (SD sequence) or opposite direction (OD sequence) of the primary saccade.

1- and 2-letter same direction displacements (1 L or 2 L SD) determined first. The amount of information available during a pointing response while wearing displacing prisms was varied by allowing the arm to remain free or by constraining it to a track.

There was significant adaptation in both conditions and the adaptation for the unconstrained or high information group was significantly by: Prismatic Adaptation Induces Plastic Changes onto Spatial and Temporal Domains in Near and Far Space.

The experimenter placed a visual target (a pen) at the distal edge of the top surface of the box, in one of three possible positions (randomly determined on each trial): a central position (0°), 21° to the left of the center, and 21° to Cited by: 4.

Adaptation to displacement of objects in the visual field was studied as a function of preexposure test targets being absent R., & Schlank, M, Adaptation to disarranged eye-hand coordination in the distance dimension.

American Journal of Psychology,72, – Jr. Adaptation to prismatic displacement: Hand position and target. Twenty Ss wore a 20 diopter displacement prism while they practiced tracking a moving target and when they performed a second task requiring location of a stationary target.

Results showed significant transfer of adaptation effects to performance on the second task, and showed a limited aftereffect upon removal of the prism. Massed and distributed practice on the tracking task produced. Development of prismatic adaptation (direct effects) Displacement errors made during prismatic exposure were pooled for pointing responses made to left and right targets.

Participants rapidly improved their pointing accuracy following an initial bias in the direction of prismatic displacement.

Adaptation to prismatic displacement was conditioned to a tone in 72 min of training by employing Taylor’s alternation training technique. The alternation consisted of two training conditions. In one, S was exposed to the prism and tone; in the other, S was exposed to neither. After training, the pointing to a visual target test measured more aftereffects of adaptation when the tone was.

(2) When limited to a central field of 8°, a higher score was again obtained with the presence of a stationary target, but the percentage of adaptation (51 %) was significantly lower than that obtained in the whole field condition (82%) (t=J. Paillard et al. / Visual motion cues in prismatic adaptation PRESENCE OR ABSENCE OF A.

A brief exposure to rightward prismatic adaptation (PA) was shown to shift visual field representation within the inferior parietal lobule (IPL) from the right to the left hemisphere. This change in hemispheric dominance could be interpreted as (1) a general effect of discrepancy in visuomotor alignment caused by PA or (2) a direction-specific.

An examination of the role of attention and visual-proprioceptive information on visual adaptation to prismatic displacement.

Unpublished doctoral dissertation, Kent State University, right of a target, but errors disappear in a dozen or so pointing trials, depending upon exposure conditions.

The person has adapted to the prismatic displacement. In the hundred years since its discovery (Helmholtz, /) a primary question has been how such adaptation occurs: what are the adaptive processes involved in prism adaptation.

of the instrument. Turn the power drum until the mires (the perpendicular cross lines), viewed through the eyepiece, are grossly out of focus.

Turn the eyepiece in the plus direction to fog (blur) the target seen through the eyepiece. Slowly turn the eyepiece in the opposite direction until the target.

The predicted posttest adaptive change from the pretest baseline was opposite the direction of prismatic displacement for the tests requiring limb movement, but in the direction of prismatic displacement for the visual shift test (Redding et al., ; Redding & Wallace, a,; Welch, ).

All measurements were to the nearest degree. Thus the final level of adaptation to laterally displaced vision was more pronounced when training was interrupted by rest breaks of 2 s (Choe and Welch ), 30 s (Taub and Goldberg ), or.

Adaptation to prismatic displacement is particularly suited for application because its incremental nature permits examination over relatively short time periods, in contrast to prismatic distortions like left-right or up-down reversal of the visual field that involve discrete, all-or-none adaptive states and require extended exposure for.

kenneth r. paap and sheldon m. ebenholtz 3 g a = 30 seconds d = 60 seconds o = seconds a a n a a n 0 12 22 32 42 left turn right turn. A fully counterbalanced extension of the Bauer and Efstathiou () study involved exposing 11 Ss to lateral prismatic displacement for five minutes and measuring their adaptation to it.

The difference between pointings at a target taken before and after prismatic exposure constitutes an adaptive shift.

MA = 1/(target distance in meters) Meter angles (MA) can be converted into prism diopters simply by multiplying it by the interpupillary distance (IPD) in cm: Prism Diopters = IPD (cm) * MA Maddox Classification of Vergence At the turn of the century, Maddox described vergence as a linear summation of responses to a variety of stimuli.

errors in the direction opposite of the prism displacement. Pointing to targets is a common task used in prism adaptation. The training task is usually performed with full sensory feedback and knowledge of results.

This is done in order to enable adaptation to the prismatic distortion. As will be explained below, the. The left-shifting prisms had an optical center distance of 64mm with a prismatic shift of prism diopters (cm/m) inducing a visual shift of Procedure.

The participants of Experiment 1 performed rhythmic pointing movements toward a central target with terminal feedback (via finger-tip diode) to test baseline, adaptation, and. perceived location of a visual target and, by inference, a shift in perceived ‘straight-ahead’ of the visual scene) is in the same direction of the prismatic displacement.

SAP involves actively pointing the adapting arm with eyes closed to the point in space that is subjectively in front of the body midline. Prism adaptation (PA) is a non-invasive procedure that requires performing a visuo-motor pointing task while wearing prism goggles inducing a visual displacement of the pointed target.

During PA, participants are asked to perform rapid pointing movements towards a target in front of them while wearing prisms, shifting the field of view sideways. displacement of the i-th joint is described by distance di if it is a prismatic joint, and by angle θi for a revolute joint.

For formal expression, let us use a generic notation: qi. Namely, joint displacement qi represents either distance di or angle θi depending on the type of joint. i { i i d q θ = () Prismatic joint Revolute joint.

The SI unit for displacement is the meter (m). Displacement has a direction as well as a magnitude. When you start a problem, assign which direction will be positive. Distance is the magnitude of displacement between two positions. Distance traveled is the total length of. ADAPTATION TO PRISMATIC ROTATION AS A FUNCTION OF FIELD, EXPOSURE ACTIVITY, AND SIGHT OF BODY PART by EARL S.

STEIN B.A., University of Maine, M.A., University of New Hampshire, A DISSERTATION Submitted to the University of New Hampshire In Partial Fulfillment of The Requirements for the Degree of Doctor of Philosophy Graduate School. Hans Wallach (Novem – February 5, ) was a German-American experimental psychologist whose research focused on perception and learning.

Although he was trained in the Gestalt psychology tradition, much of his later work explored the adaptability of perceptual systems based on the perceiver's experience, whereas most Gestalt theorists emphasized inherent qualities of stimuli.

Adaptation to prismatic displacement was examined under conditions of locomotion in hall-ways. The relative magnitude of visual and proprioceptive shift depended upon the availability of visible.

The first target step was to +10°, and the second target step was to +5°. This location then became the fixation point for the next trial in the opposite direction. Gain-increase adaptation was carried out with the eyes directed up 10° above straight-ahead gaze, and gain-decrease adaptation with the eyes directed down 10°.

Prism adaptation is one type of sensorimotor adaptation. Prism adaptation described any adaptation to a prismatic shift in vision (i.e. any magnitude or direction of shift). In this study we are using adaptation to upward-shifting prisms, which induces a downward sensorimotor after-effect.

The participants stood with their left foot behind a blue line at a distance of m to a wall. enable participants to orient the arm in line with the direction of the target and therefore bias the effect of the prismatic glasses. at the very beginning of the adaptation phase was smaller than the visual displacement induced by the.

The central target (exposed target) was situated straight ahead of the participant’s body midline (0 degrees) and the right target (non-exposed target) at 10 degrees to the right.

Europe PMC is an ELIXIR Core Data Resource Learn more >. Europe PMC is a service of the Europe PMC Funders' Group, in partnership with the European Bioinformatics Institute; and in cooperation with the National Center for Biotechnology Information at the U.S.

National Library of Medicine (NCBI/NLM).It includes content provided to the PMC International archive by participating publishers. Redding, G.M. & Wallace, B.

Components of displacement adaptation in acquisition and decay as a function of hand and hall exposure. Perception and Psychophysics, 20, Rescorla, R.A. Pavlovian conditioning analogues to Gestalt perceptual principles.

The authors found nearly 40% adaptation of the perceptual prediction in the direction of the rotated visual reafferences, and a 30% aftereffect in the motor probe test in the direction opposite to the visual rotation, as predicted by coherent adaptation of the inverse and forward models of the arm (Haruno et al., ; Flanagan et al., ).

CORRELATION BETWEEN ADAPTATION AND AFTEREFFECT. As shown in Figure 3, there was a linear correlation (r = −, P adaptation (distance of the initial impact minus distance of the final impact during PRI) and aftereffect (distance from the target of the initial impact during POS) for eight groups (,and diopters groups, and 3- 6- 9-,and throws.

During prism adaptation in left-sided neglect, patients wear prism lenses with such a rightward visual displacement. Some authors suggest that the amount of after-effect corresponds to the neglect improvement after prism adaptation (e.g. Farnè, Rossetti, Toniolo, &.

The induced prismatic effect of a lens in prism diopters equal the power of the lens (in diopters) multiplied by the displacement of the optical center (in cm). Thus, x = As to base placement, see question Concomitant direction and distance after effects of sustained covergence: A muscle potentiation explanation for eye-specific adaptation.

Perception and Psychophysics. –. Waggle dance is a term used in beekeeping and ethology for a particular figure-eight dance of the honey performing this dance, successful foragers can share information about the direction and distance to patches of flowers yielding nectar and pollen, to water sources, or to new nest-site locations with other members of the colony.

The waggle dance and the round dance are two forms of. Throwing results of a vertical prism adaptation study of one subject and an average across all subjects. A: vertical displacement of throws before (solid circles), during (empty circles), and after (shaded circles) wearing prisms is plotted for subject SN.

Exponential decay functions are fit to the adaptation and un-adaptation throws.Simply have the patient view a relatively large target, such as the 20/ or 20/ letter or a large object, in the distance. Add prism, starting with a low amount, and work your way up until the patient reports relatively stable, comfortable fusion of the target.

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