Motor planning: effect of directional uncertainty with continuous spatial cues

Pellizzer, Giuseppe; Hedges, James H.

doi:10.1007/s00221-003-1669-0

Cited by 16 publications

(14 citation statements)

References 18 publications

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“…In the present study, target and distractor(s) were spatially compatible, i.e., in close proximity and in the same hemifield, In Cardoso-Leite and Gorea's setup, the target was presented on the central meridian and distant from the distractors' location. The present results are thus in line with previous findings showing that the presentation of a compatible distractor just before a target reduces manual reaching RTs (Bock and Arnold 1992;Bock and Eversheim 2000;Pellizzer andHedges 2003, 2004). They are also in agreement with studies showing a RT reduction to a suprathreshold target by near threshold distractors only when consciously detected (Waszak and Gorea 2004;Waszak et al 2007).…”

supporting

confidence: 93%

Influence of Near Threshold Visual Distractors on Perceptual Detection and Reaching Movements

Deplancke

Madelain

Chauvin

et al. 2010

Journal of Neurophysiology

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Providing evidence against a dissociation between conscious vision for perception and unconscious vision for action, recent studies have suggested that perceptual and motor decisions are based on a unique signal but distinct decisional thresholds. The aim of the present study was to provide a direct test of this assumption in a perceptual-motor dual task involving arm movements. In 300 trials, 10 participants performed speeded pointing movements toward a highly visible target located at 10° from the fixation point and ± 45° from the body midline. The target was preceded by one or two close to threshold distractor(s) (80 ms stimulus onset asynchrony) presented ± 30° according to the target location. After each pointing movement, participants judged whether the distractor was present or not on either side of the target. Results showed a robust reaction time facilitation effect and a deviation toward the distractor when the distractor was both present and consciously perceived (Hit). A small reaction time facilitation was also observed when two distractors were physically present but undetected (double-miss)--this facilitation being highly correlated with the physical contrast of the distractors. These results are compatible with the theory proposing that perceptual and motor decisions are based on a common signal but emerge from a contrast dependent fixed threshold for motor responses and a variable context dependent criterion for perceptual responses. This paper thus extends to arm movement control previous findings related to oculomotor control.

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supporting

confidence: 93%

Influence of Near Threshold Visual Distractors on Perceptual Detection and Reaching Movements

Deplancke

Madelain

Chauvin

et al. 2010

Journal of Neurophysiology

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“…Consistent with this idea, Tse, Sheinberg and Logothetis ( 2003 ) reported poorer change detection performance along the vertical than the horizontal axis, a finding they attributed to the relatively poor spatial resolution of attention along the vertical dimension (e.g., He, Cavanagh, & Intriligator, 1996 ). Furthermore, Pellizzer and Hedges ( 2003 , 2004 ) reported that reaction time of reaching responses towards visual targets increased with positional uncertainty. This finding conformed to the predictions of a capacity-sharing model, which assumes that the processing resources for motor localization are limited, and that they are distributed as a function of the spatial distribution of the possible target locations.…”

Section: Resultsmentioning

confidence: 99%

Evidence for attentional processing in spatial localization

Adam

Davelaar

Gouw

et al. 2007

Psychological Research

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Using a dual-task methodology, this study examined the involvement of selective attention in spatial localization. Thirty participants located a single, briefly presented, peripheral target stimulus, appearing in one of 50 positions on either side of a central fixation point, with or without the requirement to identify a simultaneously presented central distractor stimulus. Results revealed a robust interference effect in localization performance at short target durations that depended on the number of the to-be-identified distractor items. This outcome provides convergent support for the role of the attentional system in spatial localization.

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“…Consequently, there is a large fronto-parietal network that is involved in the evaluation of the probability of an upcoming motor response. We have investigated in previous studies the effect of spatial uncertainty about the location of the upcoming target by varying the number of locations (Pellizzer and Hedges, 2003;Tzagarakis et al, 2010;Tzagarakis et al, 2019), or the size of the sector of space (Pellizzer and Hedges, 2004;Tzagarakis et al, 2015) where the upcoming target could be presented. We have shown that the power of the peri-Rolandic beta-band during motor preparation decreased further, the less uncertain the location of the upcoming target was (Tzagarakis et al, 2010;Tzagarakis et al, 2015;Tzagarakis et al, 2019).…”

Section: Reliability Of Informationmentioning

confidence: 99%

Neural encoding of the reliability of directional information during the preparation of targeted movements

Tzagarakis

West

Pellizzer

2020

Preprint

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Visual information about an upcoming target can be used to prepare an appropriate motor response and reduce its reaction time. However, when the anticipation is incorrect and the planned response must be changed, the reaction time is lengthened. Here, we investigated the brain mechanisms associated with the reliability and validity of visual information used for motor preparation. We recorded brain activity using magnetoencephalography (MEG) during a delayed reaching task in which a visual cue provided valid information about the location of the upcoming target with 50, 75 or 100% reliability. We found that reaction time increased as cue reliability decreased and that trials with invalid cues had longer reaction times than trials with valid cues. MEG channel analysis showed that beta-band power from left mid-anterior channels correlated with the reliability of the cue after cue onset but before target onset. This effect was source localized over a large motor-related cortical and subcortical network. In addition, during invalid-cue trials there was a phasic increase of theta-band power following target onset from left posterior channels, localized to the left occipito-parietal cortex. Furthermore, the theta-beta cross-frequency coupling between left mid-occipital and motor cortex also transiently increased before responses to invalid-cue trials. In conclusion, beta-band power in motor-related areas reflected the reliability of visual information used during motor preparation, whereas phasic theta-band activity signaled whether the target was at the expected location or not. These results elucidate mechanisms of interaction between attentional and motor processes.Significance StatementWe used magnetoencephalography to investigate how the brain mechanisms preparing a motor response take into account the reliability of information about the upcoming location of a target to reach, and how these mechanisms adjust when that information turns out to be incorrect. We found that during the response preparation, the power of motor-related beta-band oscillations changed with the reliability of the visual information. In addition, we found that after the onset of the target the power of the left occipito-parietal theta-band signaled whether the prior information was correct or not. The pattern of activity of the beta-band and theta-band explain the pattern of latency of responses in the task, and demonstrate how attentional and motor processes interact.

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Motor planning: effect of directional uncertainty with continuous spatial cues

Cited by 16 publications

References 18 publications

Influence of Near Threshold Visual Distractors on Perceptual Detection and Reaching Movements

Influence of Near Threshold Visual Distractors on Perceptual Detection and Reaching Movements

Evidence for attentional processing in spatial localization

Neural encoding of the reliability of directional information during the preparation of targeted movements

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