A simple method for recording motor evoked potentials of lingual muscles to transcranial magnetic and peripheral electrical stimulation

Ghezzi, Angelo; Baldini, S.

doi:10.1016/s0924-980x(98)00008-3

Cited by 25 publications

(21 citation statements)

References 12 publications

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“…17,18,23,24 This finding is in accordance with our findings in the present study and may reflect at least a slight predominance of contralateral descending corticonuclear projections. Some investigators-V''' report contralateral MEP amplitudes to be higher when recorded from the right side of the tongue or to be higher in response to stimulation of the left hernicortex.…”

Section: Contrasupporting

confidence: 90%

See 1 more Smart Citation

Tongue Representation in the Lateral Cortical Motor Region of the Human Brain as Assessed by Transcranial Magnetic Stimulation

Rödel¹,

Laskawi²,

Markus³

2003

Ann Otol Rhinol Laryngol

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Motor evoked potentials (MEPs) of the lingual muscles elicited by focal cortical transcranial magnetic stimulation (TMS) with a figure 8-shaped coil were investigated in 17 healthy subjects with special regard to amplitude and onset latency as a function of the coil position on the head surface. Bilateral reproducible responses could be observed at coil positions mostly varying from approximately 6 to 13 cm lateral to the vertex. During moderate muscle activation, maximum responses were obtained at a mean stimulus position of about 11 cm lateral and 3 cm anterior to the vertex with similar onset latencies, but with significantly higher amplitudes on the contralateral side (3.5 +/- 1.9 mV, 9.5 +/- 1.1 ms contralateral; 2.6 +/- 1.5 mV, 9.7 +/-1.0 ms ipsilateral). Comparing our data on the orbicularis oculi muscle with the results obtained on lower lip muscles, we found a considerable overlap of those coil positions from which reproducible MEPs could be elicited in both groups of target muscles, but the lingual area was placed more laterally. Thus, a statistically significant separation of the cortical representation areas of lingual and lower lip mimetic muscles is possible by focal cortical TMS, reflecting somatotopic organization of the face-associated motor cortex.

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Section: Contrasupporting

confidence: 90%

“…J J . , , , , , , , 1.2mV : : : --------,-------,-------- As introduced in previous studies, [16][17][18] recordings were taken simultaneously from both sides of the tongue by surface electrodes 10 mm in diameter embedded in a customized mouthpiece as suggested by Meyer and Bischoff"? (Fig 1).…”

mentioning

confidence: 99%

Tongue Representation in the Lateral Cortical Motor Region of the Human Brain as Assessed by Transcranial Magnetic Stimulation

Rödel¹,

Laskawi²,

Markus³

2003

Ann Otol Rhinol Laryngol

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“…The mean latencies of the lingual MEPs were 7.8 (Ghezzi et al, 1998), 8.5 (Meyer et al, 1997, and 9.5 ms (Rödel et al, 2003) for the contralateral hemisphere, which were similar to the corticomuscular mean latency of 9.1 ms in the present study. The short corticomuscular latency for the contralateral tongue muscles suggests the activation of a fast-conducting corticonuclear connection through the hypoglossal motor nucleus compared to the contralateral thumb muscles, which pass through spinal motoneuron pools.…”

Section: Time Lags Between Meg and Emg Signalssupporting

confidence: 87%

“…Previous transcranial magnetic stimulation (TMS) studies reported that unilateral focal cortical TMS could elicit lingual motor-evoked potentials (MEPs) bilaterally (Meyer et al, 1997;Ghezzi et al, 1998;Rödel et al, 2003). Because the tongue is innervated bilaterally by corticobulbar fibers through the hypoglossal nucleus, it is likely that cortical oscillation occurs in both hemispheres during tongue protrusion.…”

Section: Coherence At 15-35 Hzmentioning

confidence: 99%

Contralateral dominance of corticomuscular coherence for both sides of the tongue during human tongue protrusion: An MEG study

et al. 2014

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Sophisticated tongue movements contribute to speech and mastication. These movements are regulated by communication between the bilateral cortex and each tongue side. The functional connection between the cortex and tongue was investigated using oscillatory interactions between whole-head magnetoencephalographic (MEG) signals and electromyographic (EMG) signals from both tongue sides during human tongue protrusion compared to thumb data. MEG-EMG coherence was observed at 14-36 Hz and 2-10 Hz over both hemispheres for each tongue side. EMG-EMG coherence between tongue sides was also detected at the same frequency bands. Thumb coherence was detected at 15-33 Hz over the contralateral hemisphere. Tongue coherence at 14-36Hz was larger over the contralateral vs. ipsilateral hemisphere for both tongue sides.Tongue cortical sources were located in the lower part of the central sulcus and were anterior and inferior to the thumb areas, agreeing with the classical homunculus.Cross-correlogram analysis showed the MEG signal preceded the EMG signal. The cortex-tongue time lag was shorter than the cortex-thumb time lag. The cortex-muscle time lag decreased systematically with distance. These results suggest that during tongue protrusions, descending motor commands are modulated by bilateral cortical oscillations, and each tongue side is dominated by the contralateral hemisphere.

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“…A limited number of studies have sought to stimulate the neural pathways leading to the tongue and other orofacial muscles, with the intent of these studies primarily being to identify the optimal cortical sites for stimulation in non-neurologically impaired speakers. Non-focal circular coils were used in early TMS studies of the tongue (Muellbacher et al, 1994(Muellbacher et al, , 1999Campos et al, 1995;Urban et al, 1996Urban et al, , 1997Urban et al, , 1998Urban et al, , 1999Ghezzi and Baldini, 1998;Katayama et al, 2001). A figure-of-eight coil configuration, however, provides stimulation that is more focal and of a defined orientation compared to circular coils (Mills, 1999) and, therefore, has become the most common type of coil used in contemporary TMS applications involving the tongue (Meyer et al, 1997;Ghezzi and Baldini, 1998;Muellbacher et al, 2001;Fadiga et al, 2002;Rödel et al, 2003;Svensson et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Determining the optimal current direction of transcranial magnetic stimulation to induce motor responses in the tongue: A preliminary study of neurologically healthy individuals

Murdoch

Barwood

Goozee

et al. 2013

Speech, Language and Hearing

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Objective: To determine the optimal transcranial magnetic stimulation (TMS) coil direction for inducing motor responses in the tongue in a group of non-neurologically impaired participants. Methods: Single-pulse TMS was delivered using a figure-of-eight Magstim 200 2 TMS coil. Study 1 investigated the effect of eight different TMS coil directions on the motor-evoked potentials elicited in the tongue in eight adults. Study 2 examined active motor threshold levels at optimal TMS coil direction compared to a customarily-used ventral-caudal direction. Study 3 repeated the procedure of Study 1 at five different sites across the tongue motor cortex in one adult. Results: Inter-individual variability in optimal direction was observed, with an optimal range of directions determined for the group. Active motor threshold was reduced when a participant's own optimal TMS coil direction was used compared to the ventral-caudal direction. A restricted range of optimal directions was identified across the five cortical positions tested. Conclusions: There is a need to identify each individual's own optimal TMS coil direction in investigating tongue motor cortex function. A recommended procedure for determining optimal coil direction is described. Significance: Optimized TMS procedures are needed so that TMS can be utilized in determining the underlying neurophysiological basis of various motor speech disorders.

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A simple method for recording motor evoked potentials of lingual muscles to transcranial magnetic and peripheral electrical stimulation

Cited by 25 publications

References 12 publications

Tongue Representation in the Lateral Cortical Motor Region of the Human Brain as Assessed by Transcranial Magnetic Stimulation

Tongue Representation in the Lateral Cortical Motor Region of the Human Brain as Assessed by Transcranial Magnetic Stimulation

Contralateral dominance of corticomuscular coherence for both sides of the tongue during human tongue protrusion: An MEG study

Determining the optimal current direction of transcranial magnetic stimulation to induce motor responses in the tongue: A preliminary study of neurologically healthy individuals

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