Modulation of human motoneuron activity by a mental arithmetic task

Bensoussan, L.; Duclos, Yann; Rossi-Durand, Christiane

doi:10.1016/j.humov.2012.02.008

Cited by 6 publications

(5 citation statements)

References 60 publications

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“…In the same vein, Rossini et al (1999) showed that mental simulation of finger movement increases excitability of the spinal motoneuronal pools governing muscles involved in finger movement. Furthermore, a recent examination of handrelated motoneuron activity has shown that a mental arithmetic task affects the rate and variability of the tonic discharge of motor units (Bensoussan et al, 2012). The increases observed in hand EMG activity were consistent with the modulation of the motor unit discharge rate induced by mental arithmetics.…”

Section: Discussionsupporting

confidence: 54%

An EMG Study of the Lip Muscles During Covert Auditory Verbal Hallucinations in Schizophrenia

Rapin

Dohen

Polosan

et al. 2013

J Speech Lang Hear Res

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Purpose: Auditory verbal hallucinations (AVHs) are speech perceptions in the absence of a external stimulation. An influential theoretical account of AVHs in schizophrenia claims that a deficit in inner speech monitoring would cause the verbal thoughts of the patient to be perceived as external voices. The account is based on a predictive control model, in which verbal self-monitoring is implemented. The aim of this study was to examine lip muscle activity during AVHs in schizophrenia patients, in order to check whether inner speech occurred.Methods: Lip muscle activity was recorded during covert AVHs (without articulation) and rest. Surface electromyography (EMG) was used on eleven schizophrenia patients. Results:Our results show an increase in EMG activity in the orbicularis oris inferior muscle, during covert AVHs relative to rest. This increase is not due to general muscular tension since there was no increase of muscular activity in the forearm muscle. Conclusion:This evidence that AVHs might be self-generated inner speech is discussed in the framework of a predictive control model. Further work is needed to better describe how the inner speech monitoring dysfunction occurs and how inner speech is controlled and monitored. This will help better understanding how AVHs occur.

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Section: Discussionsupporting

confidence: 54%

An EMG Study of the Lip Muscles During Covert Auditory Verbal Hallucinations in Schizophrenia

Rapin

Dohen

Polosan

et al. 2013

J Speech Lang Hear Res

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“…It has been suggested that part of it arises from intrafusal muscle fibers [153]. A recent examination of hand-related motoneuron activity has shown that a mental arithmetic task affects the rate and variability of the tonic discharge of motor units [154]. The increases observed in hand EMG activity were consistent with the modulation of the motor unit discharge rate induced by mental arithmetics.…”

Section: Evidence For "Inner Speech Is An Action"mentioning

confidence: 72%

What is that little voice inside my head? Inner speech phenomenology, its role in cognitive performance, and its relation to self-monitoring

Perrone‐Bertolotti

Rapin

Lachaux

et al. 2014

Behavioural Brain Research

217

172

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The little voice inside our head, or inner speech, is a common everyday experience. It plays a central role in human consciousness at the interplay of language and thought. An impressive host of research works has been carried out on inner speech these last fifty years. Here we first describe the phenomenology of inner speech by examining five issues: common behavioural and cerebral correlates with overt speech, different types of inner speech (wilful verbal thought generation and verbal mind wandering), presence of inner speech in reading and in writing, inner signing and voice-hallucinations in deaf people. Secondly, we review the role of inner speech in cognitive performance (i.e., enhancement vs. perturbation). Finally, we consider agency in inner speech and how our inner voice is known to be self-generated and not produced by someone else.

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“…In young women, motor unit activity (i.e., recruitment threshold, discharge rate at recruitment or de-recruitment, and variability of discharge rate) of the trapezius muscle did not change with imposition of cognitive challenge (67). Yet in the wrist extensors of young men and women there was a reduction in the variability of discharge rate of single-motor units (3), suggesting the possibility of muscle specificity on the effects of cognitive challenge during motor tasks. At higher oscillations frequencies that have minimum influence in force steadiness (i.e., ␣: ϳ8to 14-Hz bands; ␤: ϳ15to 32-Hz bands), a cognitive challenge will increase the synchronized oscillatory activation between corticospinal cells and motor units in old but not young adults (32).…”

Section: Introductionmentioning

confidence: 88%

Oscillations in neural drive and age-related reductions in force steadiness with a cognitive challenge

Pereira

Schlinder-Delap

Keenan

et al. 2019

Journal of Applied Physiology

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A cognitive challenge when imposed during a low-force isometric contraction will exacerbate sex- and age-related decreases in force steadiness, but the mechanism is not known. We determined the role of oscillations in the common synaptic input to motor units on force steadiness during a muscle contraction with a concurrent cognitive challenge. Forty-nine young adults (19–30 yr; 25 women, 24 men) and 36 old adults (60–85 yr; 19 women, 17 men) performed a cognitive challenge (counting backward by 13) during an isometric elbow flexion task at 5% of maximal voluntary contraction. Single-motor units were decomposed from high-density surface EMG recordings. For a subgroup of participants, motor units were matched during control and cognitive challenge trials, so the same motor unit was analyzed across conditions. Reduced force steadiness was associated with greater oscillations in the synaptic input to motor units during both control and cognitive challenge trials ( r = 0.45–0.47, P < 0.01). Old adults and young women showed greater oscillations in the common synaptic input to motor units and decreased force steadiness when the cognitive challenge was imposed, but young men showed no change across conditions (session × age × sex, P < 0.05). Oscillations in the common synaptic input to motor units is a potential mechanism for altered force steadiness when a cognitive challenge is imposed during low-force contractions in young women and old adults. NEW & NOTEWORTHY We found that oscillations in the common synaptic input to motor units were associated with a reduction in force steadiness when a cognitive challenge was imposed during low-force contractions of the elbow flexor muscles in young women and old men and women but not young men. Age- and sex-related muscle weakness was associated with these changes.

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Modulation of human motoneuron activity by a mental arithmetic task

Cited by 6 publications

References 60 publications

An EMG Study of the Lip Muscles During Covert Auditory Verbal Hallucinations in Schizophrenia

An EMG Study of the Lip Muscles During Covert Auditory Verbal Hallucinations in Schizophrenia

What is that little voice inside my head? Inner speech phenomenology, its role in cognitive performance, and its relation to self-monitoring

Oscillations in neural drive and age-related reductions in force steadiness with a cognitive challenge

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