Reciprocal modulation of somatosensory evoked N20m primary response and high-frequency oscillations by interference stimulation

Hashimoto, Isao; Kimura, Tomoaki; Fukushima, Tatsuomi; Iguchi, Yoshinobu; Saito, Yasuhiko; Terasaki, Omi; Sakuma, Kenji

doi:10.1016/s1388-2457(99)00083-8

Cited by 64 publications

(11 citation statements)

References 42 publications

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“…This findings was in good agreement with previous findings during natural sleep (Halboni et al, 2000;Hashimoto et al, 1999) and propofol anesthesia (Klostermann et al, 2000). Halboni and colleagues demonstrated that HFOs reconstructed by source analysis at the cortex and the deep brain structure at the level of thalamus were both reduced in amplitude with a very high intercorrelation (Halboni et al, 2000).…”

Section: Discussionsupporting

confidence: 90%

“…Several studies have disclosed that HFOs show decreased amplitudes during natural sleep while SW remains stable, proposing an IBI origin of HFOs (Yamada et al, 1980;Hashimoto et al, 1996). A similar reciprocal relation between SW and HFOs was demonstrated when tactile or movement interferences were applied to electrical stimulation of the peripheral nerve (Hashimoto et al, 1999;Tanosaka et al, 2002).…”

mentioning

confidence: 82%

“…P rimary cortical components of somatosensory evoked potentials (SEPs) include different frequency components, such as low-frequency slow wave (SW) and high-frequency oscillations (HFOs) (Hashimoto et al, 1996(Hashimoto et al, , 1999Klostermann et al, 2000;Kojima et al, 2001;Ozaki and Hashimoto, 2001;Tanosaka et al, 2002;Urasaki et al, 2002a). Low-frequency SW of primary cortical SEPs is generated by excitatory postsynaptic potentials (EPSPs) in apical dendrites of pyramidal neurons (Hashimoto et al, 1996;Hashimoto et al, 1999;Ozaki and Hashimoto, 2001).…”

mentioning

confidence: 99%

“…Low-frequency SW of primary cortical SEPs is generated by excitatory postsynaptic potentials (EPSPs) in apical dendrites of pyramidal neurons (Hashimoto et al, 1996;Hashimoto et al, 1999;Ozaki and Hashimoto, 2001). Recent studies disclosed that cortical HFOs are generated from (1) thalamocortical projection fibers (Gobbelé et al, 1999;Klostermann et al, 1999;Curio, 2000) and intracortical activities including (2) the inhibitory interneuron (IBI) (Hashimoto et al, 1996; or (3) fast inhibitory postsynaptic potentials of pyramidal neurons (Jones et al, 2000).…”

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confidence: 99%

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Effects of General Anesthesia on High-Frequency Oscillations in Somatosensory Evoked Potentials

Urasaki

Genmoto²,

Yokota³

et al. 2006

Journal of Clinical Neurophysiology

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To determine the characteristics of high-frequency oscillations (HFOs) of cortical somatosensory evoked potentials (SEPs), the effect of general anesthesia on HFOs and low-frequency primary cortical responses was studied. The authors recorded SEPs elicited by median nerve stimulation directly from human brains of seven patients who underwent implantation of subdural electrodes before surgical treatment of intractable epilepsy. Recordings were made before and during general anesthesia. Changes in the number of HFOs and amplitude ratios of HFOs/primary cortical responses were analyzed. Under general anesthesia, the number of HFO peaks and the amplitude ratios were significantly decreased. General anesthesia induced remarkably decreased HFO activities when compared to low-frequency SEPs, suggesting that each of those originated from different generators. Possible relations between gamma-amino-butyric acid (GABA)ergic inhibitory interneurons and HFOs are discussed.

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Section: Discussionsupporting

confidence: 90%

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confidence: 82%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Effects of General Anesthesia on High-Frequency Oscillations in Somatosensory Evoked Potentials

Urasaki

Genmoto²,

Yokota³

et al. 2006

Journal of Clinical Neurophysiology

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“…HFOs are known to decrease during sleep, whereas the N20 amplitude increases moderately (Hashimoto, Mashiko, & Imada, 1996). This reciprocal relation, which in the opposite direction could also be shown during interference stimulation, led to the hypothesis that HFOs represent activity of GABAergic inhibitory interneurons of layer IV (Hashimoto et al, 1999).…”

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confidence: 99%

Electrophysiological evidence for altered early cerebral somatosensory signal processing in schizophrenia

et al. 2004

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Various studies have indicated an impairment of sensory signal processing in schizophrenic patients. Anatomical and functional imaging studies have indicated morphological and metabolic abnormalities in the thalamus in schizophrenia. Other results give evidence for an additional role of cortical dysfunction in sensory processing in schizophrenia. Advanced analysis of human median nerve somatosensory evoked potentials (SEPs) reveals a brief oscillatory burst of low-amplitude and high-frequency activity ( approximately 600 Hz), the so-called high frequency oscillations (HFOs). The present study explores the behavior of HFOs in a cohort of schizophrenic patients in comparison to a group of controls. HFOs in the group of patients appeared with a delayed latency. In the low-frequency part of the SEPs an increase in amplitude was found. These results are interpreted to reflect a lack of somatosensory inhibition in the somatosensory pathway, either at a thalamic or a cortical level.

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Hand somatosensory subcortical and cortical sources assessed by functional source separation: An EEG study

Porcaro¹,

Lorenzo²,

Zappasodi³

et al. 2009

Human Brain Mapping

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We propose a novel electroencephalographic application of a recently developed cerebral source extraction method (Functional Source Separation, FSS), which starts from extracranial signals and adds a functional constraint to the cost function of a basic independent component analysis model without requiring solutions to be independent. Five ad-hoc functional constraints were used to extract the activity reflecting the temporal sequence of sensory information processing along the somatosensory pathway in response to the separate left and right median nerve galvanic stimulation. Constraints required only the maximization of the responsiveness at specific latencies following sensory stimulation, without taking into account that any frequency or spatial information. After source extraction, the reliability of identified FS was assessed based on the position of single dipoles fitted on its retroprojected signals and on a discrepancy measure. The FS positions were consistent with previously reported data (two early subcortical sources localized in the brain stem and thalamus, the three later sources in cortical areas), leaving negligible residual activity at the corresponding latencies. The high-frequency component of the oscillatory activity (HFO) of the extracted component was analyzed. The integrity of the low amplitude HFOs was preserved for each FS. On the basis of our data, we suggest that FSS can be an effective tool to investigate the HFO behavior of the different neuronal pools, recruited at successive times after median nerve galvanic stimulation. As FSs are reconstructed along the entire experimental session, directional and dynamic HFO synchronization phenomena can be studied.

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Reciprocal modulation of somatosensory evoked N20m primary response and high-frequency oscillations by interference stimulation

Cited by 64 publications

References 42 publications

Effects of General Anesthesia on High-Frequency Oscillations in Somatosensory Evoked Potentials

Effects of General Anesthesia on High-Frequency Oscillations in Somatosensory Evoked Potentials

Electrophysiological evidence for altered early cerebral somatosensory signal processing in schizophrenia

Hand somatosensory subcortical and cortical sources assessed by functional source separation: An EEG study

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