On the relation between brain potentials and the awareness of voluntary movements

Haggard, P. and Eimer, Martin (1999) On the relation between brain potentials and the awareness of voluntary movements. Experimental Brain Research 126 (1), pp. 128-133. ISSN 0014-4819.

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Official URL: https://doi.org/10.1007/s002210050722

Abstract

We investigated the relation between neural events and the perceived time of voluntary actions or the perceived time of initiating those actions using the method of Libet. No differences were found in either movement-related potentials or perceived time of motor events between a fixed movement condition, where subjects made voluntary movements of a single finger in each block, and a free movement condition, in which subjects chose whether to respond with the left or the right index finger on each trial. We next calculated both the readiness potential (RP) and lateralised readiness potential (LRP) for trials with early and late times of awareness. The RP tended to occur later on trials with early awareness of movement initiation than on trials with late awareness, ruling out the RP as a cause of our awareness of movement intiation. However, the LRP occurred significantly earlier on trials with early awareness than on trials with late awareness, suggesting that the processes underlying the LRP may cause our awareness of movement initiation.

Metadata

Item Type:	Article
School:	Birkbeck Faculties and Schools > Faculty of Science > School of Psychological Sciences
Depositing User:	Sarah Hall
Date Deposited:	17 Dec 2019 10:43
Last Modified:	02 Aug 2023 17:56
URI:	https://eprints.bbk.ac.uk/id/eprint/30328

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