Alpha phase resetting and event related potentials, the controversy continues
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1
University of Manchester, United Kingdom
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2
Cuban Neurosciences Centre, Cuba
The role of ‘phase resetting’ of the ongoing EEG caused by the introduction of a stimulus, and subsequent emergence of the evoked response remains controversial. While some studies have demonstrated that inter-trial phase locking in the alpha band of the ongoing EEG partially explains the evoked P1 and N1 components of the ERP, others argued that current evaluation methods of phase synchrony do not categorically support the phase resetting hypothesis. A formal statistical analysis of phase correlation (phase locking or phase coherence) illustrated that these measures are, in effect, tests for the mean vector of the repeated trials, and as such on their own are inappropriate measures of phase resetting. On the other hand, an experimental approach argues that if the phase resetting phenomena is true, one would expect to observe interactions between the organized phases due to the presentation of one stimulus (cue) with those resulting from the presentation of a subsequent stimulus (target). It then investigates such interactions in the alpha band under variable Cue-Target phase lag assumptions. This talk will present an over-review of the theoretical and empirical attempts to resolve the controversy and propose a set of necessary and sufficient conditions for unambiguous measure of phase resetting.
Conference:
10th International Conference on Cognitive Neuroscience, Bodrum, Türkiye, 1 Sep - 5 Sep, 2008.
Presentation Type:
Oral Presentation
Topic:
Symposium 10: Alpha Oscillations in Cognition?
Citation:
El-Deredy
W,
Martinez-Montes
E and
Valdés-Sosa
P
(2008). Alpha phase resetting and event related potentials, the controversy continues.
Conference Abstract:
10th International Conference on Cognitive Neuroscience.
doi: 10.3389/conf.neuro.09.2009.01.045
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Received:
27 Nov 2008;
Published Online:
27 Nov 2008.
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Correspondence:
Wael El-Deredy, University of Manchester, Manchester, United Kingdom, wael.el-deredy@uv.cl