Generalization of prism adaptation.

Redding, Gordon M.; Wallace, Benjamin

doi:10.1037/0096-1523.32.4.1006

Cited by 101 publications

(120 citation statements)

References 54 publications

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“…For spatial tasks, visual feedback of task performance plays an important role in monitoring performance and improving skill level (Redding and Wallace, 2006;Huang and Shadmehr, 2007). Analogously, auditory information plays an important role in monitoring vocal output and achieving verbal fluency (Lane and Tranel, 1971;Cowie and Douglas-Cowie, 1983).…”

Section: Introductionmentioning

confidence: 99%

Neural mechanisms underlying auditory feedback control of speech

2008

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The neural substrates underlying auditory feedback control of speech were investigated using a combination of functional magnetic resonance imaging (fMRI) and computational modeling. Neural responses were measured while subjects spoke monosyllabic words under two conditions: (i) normal auditory feedback of their speech, and (ii) auditory feedback in which the first formant frequency of their speech was unexpectedly shifted in real time. Acoustic measurements showed compensation to the shift within approximately 135 ms of onset. Neuroimaging revealed increased activity in bilateral superior temporal cortex during shifted feedback, indicative of neurons coding mismatches between expected and actual auditory signals, as well as right prefrontal and Rolandic cortical activity. Structural equation modeling revealed increased influence of bilateral auditory cortical areas on right frontal areas during shifted speech, indicating that projections from auditory error cells in posterior superior temporal cortex to motor correction cells in right frontal cortex mediate auditory feedback control of speech.

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Section: Introductionmentioning

confidence: 99%

Neural mechanisms underlying auditory feedback control of speech

2008

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“…In a number of our experiments, subjects also seem to slowly adapt to a new situation and that may likewise involve spatial remapping. The nature of spatial remapping is not well understood and at least in the case of prism adaptation, there is discussion whether spatial remapping is a form of motor learning or perceptual learning (Redding & Wallace, 2006). We argue that the tasks in our experiments are mainly perceptual tasks, so if spatial remapping indeed occurs, it will probably be a form of perceptual learning.…”

Section: General Discussion and Conclusionmentioning

confidence: 78%

“…In the literature there is agreement that this process involves some kind of spatial remapping (e.g., Redding & Wallace, 2006). There are more examples where adaptation is explained by or described as spatial remapping (e.g., Mosier, Scheidt, Acosta, & Massa-Ivaldi, 2005;Wang & Sainburg, 2005).…”

Section: General Discussion and Conclusionmentioning

confidence: 99%

How robust are the deviations in haptic parallelity?

Kappers¹,

Postma²,

Viergever³

2008

Acta Psychologica

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Several studies have shown that physically parallel bars do not feel parallel and vice versa. The most plausible cause of this deviation is the biasing influence of an egocentric reference frame. The aim of the present study was to assess the strength of this egocentric contribution. The deviations from veridicality were measured in six experiments where subjects were presented with either haptic or visual information about parallelity or their deviations. It was found that even direct error feedback (either haptically or visually) did not even nearly result in veridical performance. The improvements found were attributed to a shift in focus towards a more allocentric reference frame, possibly reflecting the same mechanisms as found in delay and noninformative vision studies. We conclude that the illusionary percept of haptic parallelity is rather robust and is indeed caused by a strong reliance on an egocentric reference frame.

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“…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%

“…Subsequent developments have included direct support for the fact that spatial discordance is only detectable with position, not vector movement codes (Redding & Wallace, 1996, 1997b; more definitive articulation in data and theory of the distinction between alignment and calibration (Redding & Wallace, 2001, 2003a; recognition that postural adjustment may affect direct effects of exposure, like terminal error, and reduce the effective spatial discordance (Redding & Wallace, 2003b; application of the theory to explain the therapeutic effect of prism adaptation for unilateral-neglect patients (Redding, Rossetti, & Wallace, 2005;Redding & Wallace, 2006b, 2010; a further evidential base for the distinctive "uniform" generalization of realignment, as compared to the associative generalization of motor learning (Redding & Wallace, 2006a; see also Simani, McGuire, & Sabes, 2007); and, most recently, extension of the theory to deal with intermanual transfer of both visual and proprioceptive realignment in both righthanders and left-handers (Redding & Wallace, 2008, 2011.…”

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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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Generalization of prism adaptation.

Cited by 101 publications

References 54 publications

Neural mechanisms underlying auditory feedback control of speech

Neural mechanisms underlying auditory feedback control of speech

How robust are the deviations in haptic parallelity?

Prism adaptation in alternately exposed hands

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