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Adaptation of lift forces in object manipulation through action observation

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Abstract

The ability to predict accurately the weights of objects is essential for skilled and dexterous manipulation. A potentially important source of information about object weight is through the observation of other people lifting objects. Here, we tested the hypothesis that when watching an actor lift an object, people naturally learn the object’s weight and use this information to scale forces when they subsequently lift the object themselves. Participants repeatedly lifted an object in turn with an actor. Object weight unpredictably changed between 2 and 7 N every 5th to 9th of the actor’s lifts, and the weight lifted by the participant always matched that previously lifted by the actor. Even though the participants were uninformed about the structure of the experiment, they appropriately adapted their lifting force in the first trial after a weight change. Thus, participants updated their internal representation about the object’s weight, for use in action, when watching a single lift performed by the actor. This ability presumably involves the comparison of predicted and actual sensory information related to actor’s actions, a comparison process that is also fundamental in action.

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Acknowledgments

This work was supported by a grant from the Canadian Institutes of Health Research, the Swedish Research Council Project 08667, and the Strategic Research Program in Neuroscience at the Karolinska Institute. We would like to thank Sean Hickman and Martin York for technical support.

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Authors and Affiliations

  1. Centre for Neuroscience Studies, Queen’s University, Kingston, ON, K7L 3N6, Canada

    Andreas F. Reichelt, Alyssa M. Ash, Lee A. Baugh & J. Randall Flanagan

  2. Department of Psychology, Queen’s University, Kingston, ON, K7L 3N6, Canada

    J. Randall Flanagan

  3. Physiology Section, Department of Integrative Medical Biology, Umeå University, SE-901 87, Umeå, Sweden

    Roland S. Johansson

Authors
  1. Andreas F. Reichelt
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  2. Alyssa M. Ash
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  3. Lee A. Baugh
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  4. Roland S. Johansson
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  5. J. Randall Flanagan
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Correspondence to J. Randall Flanagan.

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Reichelt, A.F., Ash, A.M., Baugh, L.A. et al. Adaptation of lift forces in object manipulation through action observation. Exp Brain Res 228, 221–234 (2013). https://doi.org/10.1007/s00221-013-3554-9

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  • DOI: https://doi.org/10.1007/s00221-013-3554-9

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