Universität zu Köln

Valakos, D., d'Avossa, G., Mylonas, D., Butler, J., Klein, C. and Smyrnis, N. (2020). P300 response modulation reflects breaches of non-probabilistic expectations. Sci Rep, 10 (1). LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

In oddball paradigms, infrequent stimuli elicit larger P300 event related potentials (ERPs) than frequent ones. One hypothesis is that P300 modulations reflect the degree of surprise associated with unexpected stimuli. That is the P300 represents how unlikely the stimulus is and this signal is then used to update the observer's expectations. It could be hypothesized that P300 is modulated by any factor affecting an observer's expectations, not only target probability. Alternatively, the P300 may reflect an evaluative process engaged whenever a discrepancy between task context and sensory inputs arises, irrespective of the latter probability. In previous ERP studies, stimulus probability was often the only determinant of task set confounding the effects of stimulus probability and set stimulus discrepancy. In this study, we used a speeded luminance detection task. The target was preceded by a central cue that predicted its location. The probability that the target was valid, i.e. would appear at the cued location was manipulated by varying the reliability of the cue. Reaction times were modulated by probabilistic expectations based on cue reliability and target validity while P300 was affected by target validity only. We conclude that increased P300 amplitude reflects primarily breaches of non-probabilistic expectations, rather than target probability.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Valakos, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED d'Avossa, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mylonas, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Butler, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klein, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smyrnis, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-329192
DOI:	10.1038/s41598-020-67275-0
Journal or Publication Title:	Sci Rep
Volume:	10
Number:	1
Date:	2020
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EVENT-RELATED POTENTIALS; ATTENTION; VALIDITY; PROBABILITY; SURPRISE; BRAIN Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32919