The automatic sound representation relies on salient segmentation of the acoustic input
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1
Institute of Psychology I, University of Leipzig, Germany
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2
University of Barcelona, Spain
The automatic sound representation can be investigated by utilizing the mismatch negativity (MMN) component of the event-related potential. Several findings revealed that the automatic representation of pure sinusoidal tones is limited to the initial 300-ms. This temporal constraint was reflected in the absence of MMN to deviations occurring beyond the initial 300-ms. However, a salient transient (gap, noise burst) segmenting such tones re-gained MMN and thus, resulted in a full-fledged automatic sound representation. The present study examined whether the salient segmentation of the acoustic input is pivotal for the entire automatic sound representation. We tested for MMN to duration deviants (40 % decrement) embedded in a sequence of 1000 ms long standard tones with linear increasing frequency (sweeps). In different conditions standards and deviants contained (I) no segmenting event, (II) a non-salient plateau (short sequence with the tone frequency remaining constant), or (III) a salient noise burst. No MMN was elicited to unstructured sweeps and to sweeps containing the plateau. Hence, neither permanent gradual changes characterizing sweeps nor a non-salient event within the sweeps can improve the automatic sound representation. Importantly, the sweeps segmented by a noise burst evoked MMN. Moreover, the salient noise burst itself elicited the P1-N1-P2 complex (which is associated with structuring elements) whereas the non-salient element (i.e., the plateau) did not. Consequently, salient segmentation of the acoustic input is essential for an entire automatic sound representation.
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:
Weise
A,
Grimm
S,
Müller
D and
Schröger
E
(2009). The automatic sound representation relies on salient segmentation of the acoustic input.
Conference Abstract:
MMN 09
Fifth Conference on Mismatch Negativity (MMN) and its Clinical and Scientific Applications.
doi: 10.3389/conf.neuro.09.2009.05.044
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Received:
24 Mar 2009;
Published Online:
24 Mar 2009.
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Correspondence:
Annekathrin Weise, Institute of Psychology I, University of Leipzig, Leipzig, Germany, akweise@uni-leipzig.de