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Anticipatory cortical responses during the expectancy of a predictable painful stimulation. A high‐resolution electroencephalography study
Author(s) -
Babiloni Claudio,
Brancucci Alfredo,
Babiloni Fabio,
Capotosto Paolo,
Carducci Filippo,
Cincotti Febo,
ArendtNielsen Lars,
Chen Andrew C. N.,
Rossini Paolo Maria
Publication year - 2003
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1046/j.1460-9568.2003.02851.x
Subject(s) - somatosensory system , neuroscience , electroencephalography , psychology , stimulation , stimulus (psychology) , somatosensory evoked potential , expectancy theory , electrophysiology , cognitive psychology , social psychology
In the present study, high‐resolution electroencephalography techniques modelled the spatiotemporal pattern of human anticipatory cortical responses preceding expected galvanic painful stimuli (non‐painful stimuli as a control). Do these responses reflect the activation of associative other than somatosensory systems? Anticipatory processes were probed by alpha oscillations (6–12 Hz) for the evaluation of thalamocortical channels and by negative event‐related potentials for the evaluation of cortical excitability. Compared with the control condition, a progressive reduction of the alpha power was recognized over the primary somatosensory cortex from 2 s before the painful stimulation. In contrast, the anticipatory event‐related potentials were negligible during the expectancy period. The results on the alpha power suggest that the expectancy of the painful stimulation specifically facilitated the somatosensory thalamocortical channel. Remarkably, the associative frontal‐parietal areas were not involved, possibly due to the predictable and repetitive features of the painful stimulus. The present results also suggest that negative event‐related potentials are modest preceding warned stimuli (even if painful) with a simple information content.