CaltechAUTHORS
  A Caltech Library Service

Planning multiple movements within a fixed time limit: The cost of constrained time allocation in a visuo-motor task

Zhang, Hang and Wu, Shih-Wei and Maloney, Laurence T. (2010) Planning multiple movements within a fixed time limit: The cost of constrained time allocation in a visuo-motor task. Journal of Vision, 10 (6). pp. 1-17. ISSN 1534-7362. PMCID PMC4462028. http://resolver.caltech.edu/CaltechAUTHORS:20100823-131602617

[img]
Preview
PDF - Published Version
See Usage Policy.

462Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20100823-131602617

Abstract

S.-W. Wu, M. F. Dal Martello, and L. T. Maloney (2009) evaluated subjects' performance in a visuo-motor task where subjects were asked to hit two targets in sequence within a fixed time limit. Hitting targets earned rewards and Wu et al. varied rewards associated with targets. They found that subjects failed to maximize expected gain; they failed to invest more time in the movement to the more valuable target. What could explain this lack of response to reward? We first considered the possibility that subjects require training in allocating time between two movements. In Experiment 1, we found that, after extensive training, subjects still failed: They did not vary time allocation with changes in payoff. However, their actual gains equaled or exceeded the expected gain of an ideal time allocator, indicating that constraining time itself has a cost for motor accuracy. In a second experiment, we found that movements made under externally imposed time limits were less accurate than movements made with the same timing freely selected by the mover. Constrained time allocation cost about 17% in expected gain. These results suggest that there is no single speed–accuracy tradeoff for movement in our task and that subjects pursued different motor strategies with distinct speed–accuracy tradeoffs in different conditions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1167/10.6.1DOIArticle
http://www.journalofvision.org/content/10/6/1PublisherArticle
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4462028/PubMed CentralArticle
Additional Information:© 2010 Association for Research in Vision and Ophthalmology. Received December 29, 2009; Accepted April 16, 2010. This research was funded in part by Grant EY08266 from the National Institute of Health (LTM).
Funders:
Funding AgencyGrant Number
NIHEY08266
Subject Keywords:Bayesian decision theory; expected utility; optimality; Fitt’s Law; reaching; touching
PubMed Central ID:PMC4462028
Record Number:CaltechAUTHORS:20100823-131602617
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100823-131602617
Official Citation:Zhang, H., Wu, S.-W., & Maloney, L. T. (2010). Planning multiple movements within a fixed time limit: The cost of constrained time allocation in a visuootor task. Journal of Vision, 10(6):1, 1–17, http://www.journalofvision.org/content/10/6/1, doi:10.1167/10.6.1.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19599
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:23 Aug 2010 20:46
Last Modified:13 Mar 2017 22:44

Repository Staff Only: item control page