Determining Movement Onsets from Temporal Series

Teasdale, Normand; Bard, Chantal; Fleury, Michelle; Young, Douglas E.; Proteau, Luc

doi:10.1080/00222895.1993.9941644

Cited by 185 publications

(86 citation statements)

References 47 publications

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“…The end of the transport was defined as simultaneous to the target touch. Calculating the onset of transport and aperture was performed by an automated movement parsing algorithm (Teasdale et al 1993;algorithm B). All of these landmarks were verified by visual inspection by the experimenter; any errors were corrected.…”

Section: Discussionmentioning

confidence: 99%

Effect of speed manipulation on the control of aperture closure during reach-to-grasp movements

2006

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This study investigates coordination between hand transport and grasp movement components by examining a hypothesis that the hand location, relative to the object, in which aperture closure is initiated remains relatively constant under a wide range of transport speed. Subjects made reach-tograsp movements to a dowel under four speed conditions: slow, comfortable, fast but comfortable, and maximum (i.e., as fast as possible). The distance traveled by the wrist after aperture reached its maximum (aperture closure distance) increased with an increase of transport speed across the speed conditions. This finding rejected the hypothesis and suggests that the speed of hand transport is taken into account in aperture closure initiation. Within each speed condition, however, the closure distance exhibited relatively small variability across trials, even though the total distance traveled by the wrist during the entire transport movement varied from trial to trial. The observed stability in aperture closure distance across trials implies that the hand distance to the object plays an important role in the control law governing the initiation of aperture closure. Further analysis showed that the aperture closure distance depended on the amplitude of peak aperture as well as hand velocity and acceleration. To clarify the form of the above control law, we analyzed four different mathematical models, in which a decision to initiate grasp closure is made as soon as a specific movement parameter (wrist distance to target or transport time) crosses a threshold that is either a constant value or a function of the above-mentioned other movement-related parameters. Statistical analysis performed across all movement conditions revealed that the control law model (according to which grasp initiation is made when hand distance to target becomes less than a certain linear function of aperture amplitude, hand velocity, and hand acceleration) produced significantly smaller residual errors than the other three models. The findings support the notion that transport-grasp coordination and grasp initiation is based predominantly on spatial characteristics of the arm movement, rather than movement timing.

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Section: Discussionmentioning

confidence: 99%

Effect of speed manipulation on the control of aperture closure during reach-to-grasp movements

2006

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“…The tangential speed and acceleration profiles were then found by successive differentiation. The optimal algorithm of Teasdale, Bard, Fleury, Young, and Proteau [27] was used to determine movement onset from the velocity profiles. The algorithm works as follows: Locate the sample at which the velocity time series first exceeds 10% of its maximum value (Vmax); working back from this point stop at the first sample (call it S) less than or equal to (Vmax/10)-(Vmax/100); find the standard deviation of the series between sample 1 and sample S (call this sd); working back from S stop at the first sample less than or equal to S-sd; this is the onset sample.…”

Section: Methods (Mark Methods For Small Print)mentioning

confidence: 99%

Context-dependent arm pointing adaptation

Seidler

Bloomberg

Stelmach

2001

Behavioural Brain Research

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“…For example, if the initial directional of the movement was 60º for a target positioned at 45º, the directional error was -15º. Movement onset time was calculated using the tangential speed time series derived from the torque data employing the algorithm recommended by Teasdale et al (1993). Error count was defined as the number of trials in which the directional error exceeded the 99 th percentile value of the distribution of movement angles made by each subject in the control trials that involved no LAS, in the direction towards the incorrect target (see Figure 2).…”

Section: Discussionmentioning

confidence: 99%

Unexpected acoustic stimulation during action preparation reveals gradual re-specification of movement direction

et al. 2017

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(2017) Unexpected acoustic stimulation during action preparation reveals gradual respecification of movement direction. Neuroscience, 348 . pp. 23-32. Permanent WRAP URL:http://wrap.warwick.ac.uk/88345 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription.For more information, please contact the WRAP Team at: wrap@warwick.ac.uk 1 Title: Unexpected acoustic stimulation during action preparation reveals gradual respecification of movement direction. Neuroscience (accepted)Running Head: Sounds reveal gradual re-specification of actions. Authors and AffiliationsWelber Marinovic 1 *, James Tresilian 2 , Jack L. AbstractA loud auditory stimulus (LAS), delivered during movement preparation, can help the initiation and execution of planned actions. LAS is often used as a tool to investigate motor preparation in simple reaction time (RT) tasks, where all movement parameters are known in advance. In this report, we used LAS to examine direction specification in simple and choice RT tasks. This approach allowed us to investigate how the specification of movement direction unfolds during preparation. In two experiments, participants responded to the appearance of an imperative stimulus (IS) with a ballistic wrist force directed towards one of two targets. In probe trials, LAS (120 dBa) was delivered around the time of IS presentation. In Experiment 1, reaction times in the simple RT task were faster when the LAS was presented, but the effect on the movement kinematics was negligible. In the Choice RT task, however, movement direction variability increased when the LAS was presented. In Experiment 2, when we primed movements towards one direction, our analyses revealed that the longer participants took to start a movement, the more accurate their responses became. Our results show not only that movement direction reprogramming occurs quickly and continuously, but also that LAS can be a valuable tool to obtain meaningful readouts of the state of the motor system for action.

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Determining Movement Onsets from Temporal Series

Cited by 185 publications

References 47 publications

Effect of speed manipulation on the control of aperture closure during reach-to-grasp movements

Effect of speed manipulation on the control of aperture closure during reach-to-grasp movements

Context-dependent arm pointing adaptation

Unexpected acoustic stimulation during action preparation reveals gradual re-specification of movement direction

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