Abstract
Internal representations of the body have received considerable attention in recent years, particularly in the context of tool-use. Results have supported the notion that these representations are plastic and tool-use engenders an extension of the internal representation of the arm. However, the limitations of the literature underlying this tool embodiment process have not been adequately considered or tested. For example, there is some evidence that tool-use effects do not extend beyond simplistic tool-use tasks. To further clarify this issue, 66 participants engaged in a period of tool-augmented reaches in a speeded gather-and-sort task. If task characteristics inherent to simplistic tasks are relevant to putative embodiment effects, it was predicted that there would be no effect of tool-use on tactile distance judgments or forearm bisections. A Bayesian analysis found considerable support for the null hypothesis in both outcome measures, suggesting that some of the evidence for tool embodiment may be based in task characteristics inherent in the narrow range of tool-use tasks used to study them, rather than a tool incorporation process. Potential sources of influence stemming from these characteristics are discussed.
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Experimental data, analysis scripts, and materials are available at https://osf.io/5x7h6/.
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Communicated by Winston D Byblow.
Findings previously presented at the 60th Annual Meeting of Psychonomics, Montreal, Quebec, Canada in 2019.
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Bell, J.D., Macuga, K.L. Knowing your boundaries: no effect of tool-use on body representation following a gather-and-sort task. Exp Brain Res 241, 2275–2285 (2023). https://doi.org/10.1007/s00221-023-06669-8
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DOI: https://doi.org/10.1007/s00221-023-06669-8