Spatial attention related SEP amplitude modulations covary with BOLD signal in S1--a simultaneous EEG--fMRI study

Recent studies investigating the influence of spatial-selective attention on primary somatosensory processing have produced inconsistent results. The aim of this study was to explore the influence of tactile spatial-selective attention on spatiotemporal aspects of evoked neuronal activity in the pri...

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Vydáno v:Cerebral cortex (New York, N.Y. 1991) Ročník 18; číslo 11; s. 2686
Hlavní autoři: Schubert, Ruth, Ritter, Petra, Wüstenberg, Torsten, Preuschhof, Claudia, Curio, Gabriel, Sommer, Werner, Villringer, Arno
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 01.11.2008
Témata:
Adult
Attention - physiology
Electroencephalography
Evoked Potentials, Somatosensory - physiology
Female
Fingers - physiology
Functional Laterality - physiology
Humans
Magnetic Resonance Imaging
Male
Models, Neurological
Probability
Somatosensory Cortex - physiology
Space Perception - physiology
Touch - physiology
Young Adult
ISSN:1460-2199, 1460-2199
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Shrnutí:Recent studies investigating the influence of spatial-selective attention on primary somatosensory processing have produced inconsistent results. The aim of this study was to explore the influence of tactile spatial-selective attention on spatiotemporal aspects of evoked neuronal activity in the primary somatosensory cortex (S1). We employed simultaneous electroencephalography (EEG)-functional magnetic resonance imaging (fMRI) in 14 right-handed subjects during bilateral index finger Braille stimulation to investigate the relationship between attentional effects on somatosensory evoked potential (SEP) components and the blood oxygenation level-dependent (BOLD) signal. The 1st reliable EEG response following left tactile stimulation (P50) was significantly enhanced by spatial-selective attention, which has not been reported before. FMRI analysis revealed increased activity in contralateral S1. Remarkably, the effect of attention on the P50 component as well as long-latency SEP components starting at 190 ms for left stimuli correlated with attentional effects on the BOLD signal in contralateral S1. The implications are 2-fold: First, the correlation between early and long-latency SEP components and the BOLD effect suggest that spatial-selective attention enhances processing in S1 at 2 time points: During an early passage of the signal and during a later passage, probably via re-entrant feedback from higher cortical areas. Second, attentional modulations of the fast electrophysiological signals and the slow hemodynamic response are linearly related in S1.
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ISSN:1460-2199
1460-2199
DOI:10.1093/cercor/bhn029