Engagement of the motor system in position monitoring: reduced distractor suppression and effects of internal representation quality on motor kinematics

Howard, C.J. ORCID: 0000-0002-8755-1109, Boulton, H. ORCID: 0000-0003-1919-9243, Brown, E., Arnold, C.P.A., Belmonte, M.K. ORCID: 0000-0002-4633-9400 and Mitra, S. ORCID: 0000-0001-7620-4809, 2018. Engagement of the motor system in position monitoring: reduced distractor suppression and effects of internal representation quality on motor kinematics. Experimental Brain Research, 236 (5), pp. 1445-1460. ISSN 0014-4819

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The position monitoring task is a measure of divided spatial attention in which participants track the changing positions of one or more objects, attempting to represent positions with as much precision as possible. Typically precision of representations declines with each target object added to participants' attention load. Since the motor system requires precise representations of changing target positions, we investigated whether position monitoring would be facilitated by increasing engagement of the motor system. Using motion capture, we recorded the positions of participants’ index finger during pointing responses. Participants attempted to monitor the changing positions of between one and four target discs as they moved randomly around a large projected display. After a period of disc motion, all discs disappeared and participants were prompted to report the final position of one of the targets, either by mouse click or by pointing to the final perceived position on the screen. For mouse click responses, precision declined with attentional load. For pointing responses, precision declined only up to three targets and remained at the same level for four targets, suggesting obligatory attention to all four objects for loads above two targets. Kinematic profiles for pointing responses for highest and lowest loads showed greater motor adjustments during the point, demonstrating that, like external environmental task demands, the quality of internal representations affects motor kinematics. Specifically, these adjustments reflect the difficulty of both pointing to very precisely represented locations as well as keeping representations distinct from one another.

Item Type: Journal article
Publication Title: Experimental Brain Research
Creators: Howard, C.J., Boulton, H., Brown, E., Arnold, C.P.A., Belmonte, M.K. and Mitra, S.
Publisher: Springer
Date: May 2018
Volume: 236
Number: 5
ISSN: 0014-4819
Rights: This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Divisions: Schools > School of Social Sciences
Record created by: Linda Sullivan
Date Added: 19 Mar 2018 14:37
Last Modified: 21 Aug 2020 10:15
URI: https://irep.ntu.ac.uk/id/eprint/33027

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