N1 suppression depends on attention, P2 suppression effect does not
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1
Institute of Psychology, University of Leipzig, Germany
The processing of self-generated sounds is characterized by attenuated brain responses (N1 and P2 components of the event-related potential, ERP) compared to the responses obtained with externally generated sounds. None of the previous studies has controlled for the impact of attention on this so-called N1-P2-suppression effect. We compared the processing of self-generated and externally generated sounds as indexed by ERPs and the Auditory Steady-State Response (ASSR) in different attention conditions: participants 1) generated sounds via a button press (attention being directed to the motor task and possibly to the effect of their motor behaviour, i.e. the sound), 2) passively listened to the same sounds with no task to fulfil (this is the usual “neutral” condition in N1-P2-suppression studies), 3) actively listened to the sounds and had to press a button when the sound came too early or too late (attention being directed to the sounds). Thus, allocation of attention to the sounds should be largest in 3), intermediate in 2) and smallest in 1). We observed the classic N1-P2-suppression effect (N1 and P2 amplitudes were attenuated for self-generated compared to passively listened sounds). Importantly, the N1 was higher in the actively listening compared to the passive listening condition, whereas the P2 did not differ between these conditions. No difference in the ASSR was obtained between the self-generation and passive listening conditions, but it was enhanced in the attentive listening condition. The differences in the response pattern of the N1, P2 and ASSR demonstrate that self-generation leads to a genuine suppression of the sound processing. However, in contrast to the P2, the N1 suppression effect might be superimposed by the influence of attention.
Keywords:
EEG,
Perception
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neurophysiology of Sensation and Perception
Citation:
Saupe
K,
Widmann
A and
Schröger
E
(2011). N1 suppression depends on attention, P2 suppression effect does not.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00353
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Received:
23 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Ms. Katja Saupe, Institute of Psychology, University of Leipzig, Leipzig, Germany, saupe@uni-leipzig.de