Frequency-dependent spatial distribution of human somatosensory evoked neuromagnetic fields

Hirata, Masayuki; Kato, Aitaro; Taniguchi, Masaaki; Ninomiya, Hirotomo; Cheyne, Douglas; Robinson, Stephen E.; Maruno, Motohiko; Kumura, Eiji; Ishii, Ryouhei; Hirabuki, Norio; Nakamura, Hajime; Yoshimine, Toshiki

doi:10.1016/s0304-3940(01)02483-1

Cited by 74 publications

(37 citation statements)

References 19 publications

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“…The onset latency, the strong contralateral dominance, and the source reconstruction strongly suggest an origin in primary somatosensory cortex. This is consistent with other recent studies that have reported gamma-band activity in the human primary somatosensory cortex recorded with MEG (Hirata et al, 2002;Gaetz and Cheyne, 2003;Ihara et al, 2003). Those previous studies, however, used electrical median nerve stimulation in contrast to mechanical stimulation as used here.…”

Section: Discussionsupporting

confidence: 93%

Tactile Spatial Attention Enhances Gamma-Band Activity in Somatosensory Cortex and Reduces Low-Frequency Activity in Parieto-Occipital Areas

Bauer¹,

Oostenveld²,

Peeters³

et al. 2006

J. Neurosci.

437

334

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We investigated the effects of spatial-selective attention on oscillatory neuronal dynamics in a tactile delayed-match-to-sample task. Whole-head magnetoencephalography was recorded in healthy subjects while dot patterns were presented to their index fingers using Braille stimulators. The subjects' task was to report the reoccurrence of an initially presented sample pattern in a series of up to eight test stimuli that were presented unpredictably to their right or left index finger. Attention was cued to one side (finger) at the beginning of each trial, and subjects performed the task at the attended side, ignoring the unattended side.After stimulation, high-frequency gamma-band activity (60 -95 Hz) in presumed primary somatosensory cortex (S1) was enhanced, whereas alpha-and beta-band activity were suppressed in somatosensory and occipital areas and then rebounded. Interestingly, despite the absence of any visual stimulation, we also found time-locked activation of medial occipital, presumably visual, cortex. Most relevant, spatial tactile attention enhanced stimulus-induced gamma-band activity in brain regions consistent with contralateral S1 and deepened and prolonged the stimulus induced suppression of beta-and alpha-band activity, maximal in parieto-occipital cortex. Additionally, the beta rebound over contralateral sensorimotor areas was suppressed.We hypothesize that spatial-selective attention enhances the saliency of sensory representations by synchronizing neuronal responses in early somatosensory cortex and thereby enhancing their impact on downstream areas and facilitating interareal processing. Furthermore, processing of tactile patterns also seems to recruit visual cortex and this even more so for attended compared with unattended stimuli.

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Section: Discussionsupporting

confidence: 93%

Tactile Spatial Attention Enhances Gamma-Band Activity in Somatosensory Cortex and Reduces Low-Frequency Activity in Parieto-Occipital Areas

Bauer¹,

Oostenveld²,

Peeters³

et al. 2006

J. Neurosci.

437

334

View full text Add to dashboard Cite

show abstract

“…SAM has been previously used in a variety of studies on the functions of the motor cortex [16], the human somatosensory cortex [17] and visual word recognition [18]. In addition, SAM has been shown to be able to unveil changes in cortical synchronization that are spatially coincident with the hemodynamic response found with fMRI [19].…”

Section: Image Analysismentioning

confidence: 99%

Deep brain stimulation for chronic pain investigated with magnetoencephalography

Kringelbach

Jenkinson²,

Green³

et al. 2007

NeuroReport

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“…This waveform reflects source activation from the targeted voxels while significantly reducing signals from other parts of the brain or the extracranial environment (Robinson, 2004). SAM has been used to localize functional areas by imaging source power in previous reports (Schulz et al, 2004;Hirata et al, 2002;Xiang et al, 2003). Additionally, a complementary approach to localizing high-frequency neuromagnetic activity has also illustrated its significance for the diagnostics of pathology (Gross et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Time, frequency and volumetric differences of high-frequency neuromagnetic oscillation between left and right somatosensory cortices

Kotecha

Xiang

Wang

et al. 2009

International Journal of Psychophysiology

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Frequency-dependent spatial distribution of human somatosensory evoked neuromagnetic fields

Cited by 74 publications

References 19 publications

Tactile Spatial Attention Enhances Gamma-Band Activity in Somatosensory Cortex and Reduces Low-Frequency Activity in Parieto-Occipital Areas

Tactile Spatial Attention Enhances Gamma-Band Activity in Somatosensory Cortex and Reduces Low-Frequency Activity in Parieto-Occipital Areas

Deep brain stimulation for chronic pain investigated with magnetoencephalography

Time, frequency and volumetric differences of high-frequency neuromagnetic oscillation between left and right somatosensory cortices

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