Trigeminal evoked potentials following brief air puff: Enhanced signal‐to‐noise ratio

Hashimoto, Isao

doi:10.1002/ana.410230404

Cited by 64 publications

(24 citation statements)

References 21 publications

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“…Based on the organization of the somatosensory cortex in adults, and prior work with older infants, we expected that neural responses to left hand stimulation would be maximal over lateral central electrode sites in the contralateral (right) hemisphere, and that responses to left foot stimulation would be maximal over midline electrode sites. In contrast, responses to midline lip stimulation were expected to be bilaterally represented across the central region, in line with adult studies (Hashimoto, ; Hoshiyama et al., ; Tamura, Shibukawa, Shintani, Kaneko, & Ichinohe, ). We further hypothesized that stimulation of infants’ lips would be associated with a particularly prominent response in the infant SEP.…”

Section: Introductionsupporting

confidence: 70%

Neural representations of the body in 60‐day‐old human infants

Meltzoff

Saby

Marshall

2018

Developmental Science

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The organization of body representations in the adult brain has been well documented. Little is understood about this aspect of brain organization in human infancy. The current study employed electroencephalography (EEG) with 60-day-old infants to test the distribution of brain responses to tactile stimulation of three different body parts: hand, foot, and lip. Analyses focused on a prominent positive response occurring at 150-200 ms in the somatosensory evoked potential at central and parietal electrode sites. The results show differential electrophysiological signatures for touch of these three body parts. Stimulation of the left hand was associated with greater positive amplitude over the lateral central region contralateral to the side stimulated. Left foot stimulation was associated with greater positivity over the midline parietal site. Stimulation of the midline of the upper lip was associated with a strong bilateral response over the central region. These findings provide new insights into the neural representation of the body in infancy and shed light on research and theories about the involvement of somatosensory cortex in infant imitation and social perception.

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Section: Introductionsupporting

confidence: 70%

Neural representations of the body in 60‐day‐old human infants

Meltzoff

Saby

Marshall

2018

Developmental Science

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“…MEG dipole analysis was used by Kakigi to identify the somatosensory evoked field (SEF) waveform components arising from the electrical stimulation of the index finger. The short and mid latency dipoles labeled 1M, 2M, 3M, 4M (essentially the magnetic equivalents of the N30, P50, N65 and P80 responses shown by Arnfred and colleagues) localized to the primary somatosensory cortex (SI) (Hashimoto, 1988; Kakigi et al, 2000). In another MEG dipole study, peak responses localized to the contralateral SI at 20–40 ms latencies but to the secondary somatosensory cortex (SII) at later (100–140 ms) latencies.…”

Section: Discussionmentioning

confidence: 91%

Evidence for a frontal cortex role in both auditory and somatosensory habituation: A MEG study

et al. 2008

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Auditory and somatosensory responses to paired stimuli were investigated for commonality of frontal activation that may be associated with gating using magnetoencephalography (MEG). A paired stimulus paradigm for each sensory evoked study tested right and left hemispheres independently in ten normal controls. MR-FOCUSS, a current density technique, imaged simultaneously active cortical sources. Each subject showed source localization, in the primary auditory or somatosensory cortex, for the respective stimuli following both the first (S1) and second (S2) impulses. Gating ratios for the auditory M50 response, equivalent to the P50 in EEG, were 0.54 ± 0.24 and 0.63 ± 0.52 for the right and left hemispheres. Somatosensory gating ratios were evaluated for early and late latencies as the pulse duration elicits extended response. Early gating ratios for right and left hemispheres were 0.69 ± 0.21 and 0.69 ± 0.41 while late ratios were 0.81 ± 0.41 and 0.80 ± 0.48. Regions of activation in the frontal cortex, beyond the primary auditory or somatosensory cortex, were mapped within 25 ms of peak S1 latencies in 9/10 subjects during auditory stimulus and in 10/10 subjects for somatosensory stimulus. Similar frontal activations were mapped within 25 ms of peak S2 latencies for 75% of auditory responses and for 100% of somatosensory responses. Comparison between modalities showed similar frontal region activations for 17/20 S1 responses and for 13/20 S2 responses. MEG offers a technique for evaluating cross modality gating. The results suggest similar frontal sources are simultaneously active during auditory and somatosensory habituation.

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“…Thus, especially the analysis of datasets 5–10 might be affected by the auditory response (Nikouline et al, 1999). The somatosensory response due to scalp nerve activation is likely to have a smaller contribution to the observed changes, since the studied channels were located close to the stimulation site and the somatosensory responses from the scalp are seen on the contralateral hemisphere (Bennett and Jannetta, 1980; Hashimoto, 1988). However, in the future, sham-TMS measurements would be useful to quantify the auditory and somatosensory artifacts in MSS and SV.…”

Section: Discussionmentioning

confidence: 99%

TMS-evoked changes in brain-state dynamics quantified by using EEG data

Mutanen

Nieminen

Ilmoniemi

2013

Front. Hum. Neurosci.

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To improve our understanding of the combined transcranial magnetic stimulation (TMS) and electroencephalography (EEG) method in general, it is important to study how the dynamics of the TMS-modulated brain activity differs from the dynamics of spontaneous activity. In this paper, we introduce two quantitative measures based on EEG data, called mean state shift (MSS) and state variance (SV), for evaluating the TMS-evoked changes in the brain-state dynamics. MSS quantifies the immediate TMS-elicited change in the brain state, whereas SV shows whether the rate at which the brain state changes is modulated by TMS. We report a statistically significant increase for a period of 100–200 ms after the TMS pulse in both MSS and SV at the group level. This indicates that the TMS-modulated brain state differs from the spontaneous one. Moreover, the TMS-modulated activity is more vigorous than the natural activity.

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Trigeminal evoked potentials following brief air puff: Enhanced signal‐to‐noise ratio

Cited by 64 publications

References 21 publications

Neural representations of the body in 60‐day‐old human infants

Neural representations of the body in 60‐day‐old human infants

Evidence for a frontal cortex role in both auditory and somatosensory habituation: A MEG study

TMS-evoked changes in brain-state dynamics quantified by using EEG data

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