Adaptation to a Visuomotor Shift Depends on the Starting Posture

Baraduc, Pierre; Wolpert, Daniel M.

doi:10.1152/jn.2002.88.2.973

Cited by 106 publications

(80 citation statements)

References 42 publications

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“…In addition, our findings indicate 100% transfer for movements made in the same direction of training but that are positioned in an untrained region of the workspace. This result appears to contradict the recent findings by Baraduc and Wolpert (2002) that the extent of direction generalization sharply diminishes with changes in initial arm configurations. However, that study quantified the aftereffects of transfer when exposed in the new region of space to the null condition.…”

Section: Discussioncontrasting

confidence: 93%

“…These two measures clearly do not represent the same processes, because we have shown previously that performance can transfer without the occurrence of aftereffects (Sainburg and Wang, 2002;Wang and Sainburg, 2004). Therefore, our findings support and extend those of Krakauer et al (2000) and Baraduc and Wolpert (2002) by demonstrating substantial transfer of visuomotor transformations across both movement directions and workspace location.…”

Section: Discussionsupporting

confidence: 47%

“…Previous studies of motor learning have addressed how individuals adapt to novel visuomotor transformations, imposed by rotating a virtual display of limb position (Pine et al, 1996;Ghahramani and Wolpert, 1997;Krakauer et al, 1999;Baraduc and Wolpert, 2002;Sainburg, 2002;Sainburg and Wang, 2002;Tong et al, 2002;Sainburg, 2003, 2004). However, the mechanisms that underlie the associated remapping of the relationship between hand movements and the visual display remain uncertain.…”

Section: Introductionmentioning

confidence: 99%

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Adaptation to Visuomotor Rotations Remaps Movement Vectors, Not Final Positions

Wang¹,

Sainburg²

2005

J. Neurosci.

102

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When exposed to novel visuomotor rotations, subjects readily adapt reaching movements, such that the virtual display of the hand is brought to the target. Whereas this clearly reflects remapping of the relationship between hand movements and the visual display, the nature of this remapping is not well understood. We now examine whether such adaptation results in remapping of the position of the visually displayed target and the final limb position or between the target vector and the movement vector. The latter is defined relative to a starting position, whereas the former should be independent of the starting position. Subjects first adapted to a 30°rotation during reaching movements made from a single starting location to four different target locations. After adaptation, generalization trials were introduced, during which reaching movements were made under the same visual rotation condition but started from one of two locations outside the practiced workspace. These trials were directed to either the previously practiced targets or new targets that reflected the direction and distance of the practiced trials. Generalization was greatest for movements made in similar directions, regardless of changes in spatial location. Most significantly, when reaching to the previously adapted targets, subjects did not reach to the previously learned limb positions but rather to positions that reflected a near 30°rotation of the new target vector. These results indicate that learned visuomotor rotations remap the representations of movement vectors and not final positions of the limb in the workspace.

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Section: Discussioncontrasting

confidence: 93%

Section: Discussionsupporting

confidence: 47%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adaptation to Visuomotor Rotations Remaps Movement Vectors, Not Final Positions

Wang¹,

Sainburg²

2005

J. Neurosci.

102

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“…It is often assumed that people who are used to wearing corrective glasses can instantly account for the distortions of the visual field that are induced by their glasses when they put them on (eg Baraduc and Wolpert 2002). This assumption is supported by evidence that multiple sets of visuo-motor mappings can be acquired and can be accessed instantly: subjects no longer made the initial errors typically found when putting on or taking off prism glasses when they repeatedly threw tennis balls to each other with and without wearing 30 D prism glasses (5400 throws with and 6450 throws without over a 6 week period; Martin et al 1996).…”

mentioning

confidence: 99%

Are People Adapted to Their Own Glasses?

et al. 2012

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Abstract. Negative lenses, either in the form of glasses or contact lenses, can correct nearsightedness. Unlike contact lenses, glasses do not only correct, but also induce optic distortions. In the scientific literature, it has often been assumed that people who wear corrective glasses instantaneously account for these distortions when they put their glasses on. We tested this assumption and found that, when people switched between their contact lenses and their glasses, they made the errors that one would predict based on the optics. This shows that people are not immediately adapted to their own glasses when they put them on.

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“…The exposure aftereffect methodology for distinguishing between realignment and error correction contributions to prism adaptation depends upon the differential generalization of the two adaptive processes. The hallmark of ordinary error correction in prism adaptation is associative generalization; that is, such adaptation generalizes incrementally depending upon the similarity between training and test conditions (Baraduc & Wolpert, 2002;Field, Shipley, & Cunningham, 1999;Kitazawa et al, 1997;Martin et al, 1996). In contrast, spatial realignment generalizes uniformly from a single training point to all points in a realigned spatial map (Bedford, 1989(Bedford, , 1993a(Bedford, , b, 1999Guigon & Baraduc, 2002;Redding & Wallace, 2006a).…”

Section: Prism Adaptationmentioning

confidence: 99%

Prism adaptation in alternately exposed hands

Redding

Wallace

2013

Atten Percept Psychophys

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We assessed intermanual transfer of the proprioceptive realignment aftereffects of prism adaptation in right-handers by examining alternate target pointing with the two hands for 40 successive trials, 20 with each hand. Adaptation for the right hand was not different as a function of exposure sequence order or postexposure test order, in contrast with adaptation for the left hand. Adaptation was greater for the left hand when the right hand started the alternate pointing than when the sequence of target-pointing movements started with the left hand. Also, the largest left-hand adaptation appeared when that hand was tested first after exposure. Terminal error during exposure varied in cycles for the two hands, converging on zero when the right hand led, but no difference appeared between the two hands when the left hand led. These results suggest that transfer of proprioceptive realignment occurs from the right to the left hand during both exposure and postexposure testing. Such transfer reflects the process of maintaining spatial alignment between the two hands. Normally, the left hand appears to be calibrated with the right-hand spatial map, and when the two hands are misaligned, the lefthand spatial map is realigned with the right-hand spatial map.

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Adaptation to a Visuomotor Shift Depends on the Starting Posture

Cited by 106 publications

References 42 publications

Adaptation to Visuomotor Rotations Remaps Movement Vectors, Not Final Positions

Adaptation to Visuomotor Rotations Remaps Movement Vectors, Not Final Positions

Are People Adapted to Their Own Glasses?

Prism adaptation in alternately exposed hands

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