The processing of self-initiated but unexpected sounds: Evidence for an internal prediction mechanism
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1
University of Leipzig, Institute of Psychology, BioCog - Cognitive including biological psychology, Germany
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2
Max-Planck-Institute for human cognitive and brain sciences, Germany
How can we accurately discriminate between the sensory consequences of our own actions and from those of others? With internal prediction mechanisms, the sensory consequences of one’s own actions can be predicted, in contrast to those of others, which can not be predicted. In human EEG studies, it has been shown that self-initiated sounds elicited a smaller N1 response than did externally-initiated sounds. In previous studies, the self-initiated sounds were, at least partially, expected. Here, we tested whether self-initiated but unexpected sounds would also elicit an attenuated N1 response, as did self-initiated but expected sounds compared to externally-initiated sounds. The participants were asked to press one of two buttons equally often in a self-paced interval that triggered the presentation of either a high or low piano sound. A different, unexpected piano sound randomly followed one of the two button presses. Identical sound sequences were played back as externally-initiated sounds. Diminished N1 responses were observed for the self-initiated expected sounds compared to the externally-initiated replayed sounds. The N1 amplitudes for self-initiated unexpected sounds were also attenuated. Further, the unexpected sounds elicited another negativity around 200 ms (similar to an N2b component) which was not seen with self-initiated expected sounds or externally-initiated replayed sounds. Thus, the internal prediction mechanism presumably tolerates unexpected but self-initiated sounds. In addition, the late negativity observed for the processing of unexpected sounds points towards the involvement of a ‘target detection system’ since a sound was produced which was not intended.
Conference:
MMN 09
Fifth Conference on Mismatch Negativity (MMN) and its Clinical and Scientific Applications, Budapest, Hungary, 4 Apr - 7 Apr, 2009.
Presentation Type:
Poster Presentation
Topic:
Poster Presentations
Citation:
Baess
P,
Schimming
A,
Keller
PE and
Schröger
E
(2009). The processing of self-initiated but unexpected sounds: Evidence for an internal prediction mechanism.
Conference Abstract:
MMN 09
Fifth Conference on Mismatch Negativity (MMN) and its Clinical and Scientific Applications.
doi: 10.3389/conf.neuro.09.2009.05.062
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Received:
24 Mar 2009;
Published Online:
24 Mar 2009.
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Correspondence:
Pamela Baess, University of Leipzig, Institute of Psychology, BioCog - Cognitive including biological psychology, Leipzig, Germany, baess@uni-leipzig.de