Cerebral magnetic fields associated with voluntary limb movements in man

Hari, Riitta; Antervo, A.; Katila, T.; Poutanen, T.; Seppänen, Marko; Tuomisto, Timo; Varpula, Timo

doi:10.1007/bf02455947

Cited by 35 publications

(10 citation statements)

References 16 publications

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“…As has been stated earlier (14), the shape and the time of occurrence of the shifts remained intraindividually rather constant during the different days of recordings. As has been stated earlier (14), the shape and the time of occurrence of the shifts remained intraindividually rather constant during the different days of recordings.…”

Section: -+ --R Asupporting

confidence: 73%

Cerebral magnetic fields preceding self-paced plantar flexions of the foot

Antervo

Hari

Katila

et al. 1983

Acta Neurologica Scandinavica

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Cerebral magnetic fields preceding self-paced plantar flexions of the feet were studied with a SQUID gradiometer in 4 subjects. A slow magnetoencephalographic (MEG) shift was observed to begin as early as 1 sec before the movement. The shift changed its polarity between frontal and parietal areas. The MEG shifts preceding right and left foot movements were similar in shape, but their polarities differed at many recording locations. Simultaneous movements of both feet were preceded by shifts approximately equal to the sum of the shifts preceding the unilateral foot movements at the same recording location. The results suggest that the EEG and MEG shifts preceding foot movements are largely generated by tangential current sources on the mesial surface of the contralateral hemisphere around the motor representation area of the foot.

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Section: -+ --R Asupporting

confidence: 73%

Cerebral magnetic fields preceding self-paced plantar flexions of the foot

Antervo

Hari

Katila

et al. 1983

Acta Neurologica Scandinavica

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“…Following the development of the initial MEG-based recordings of evoked responses to somatosensory stimulation (Brenner et al, 1978; Kaufman et al, 1981; Hari et al, 1983b) and voluntary movement (Deecke et al, 1982; Hari et al, 1983a; Weinberg et al, 1983), SEFs and MRCFs have been utilized to examine sensorimotor processing in the upper and lower limbs in both clinical and research-based investigations. In this section, we review sensorimotor processing of the tongue region as visualized using SEFs and MRCFs.…”

Section: The Physiology Of Tongue Sensorimotor Processingmentioning

confidence: 99%

Cortical Mechanisms of Tongue Sensorimotor Functions in Humans: A Review of the Magnetoencephalography Approach

Maezawa

2017

Front. Hum. Neurosci.

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The tongue plays important roles in a variety of critical human oral functions, including speech production, swallowing, mastication and respiration. These sophisticated tongue movements are in part finely regulated by cortical entrainment. Many studies have examined sensorimotor processing in the limbs using magnetoencephalography (MEG), which has high spatiotemporal resolution. Such studies have employed multiple methods of analysis, including somatosensory evoked fields (SEFs), movement-related cortical fields (MRCFs), event-related desynchronization/synchronization (ERD/ERS) associated with somatosensory stimulation or movement and cortico-muscular coherence (CMC) during sustained movement. However, the cortical mechanisms underlying the sensorimotor functions of the tongue remain unclear, as contamination artifacts induced by stimulation and/or muscle activity within the orofacial region complicates MEG analysis in the oral region. Recently, several studies have obtained MEG recordings from the tongue region using improved stimulation methods and movement tasks. In the present review, we provide a detailed overview of tongue sensorimotor processing in humans, based on the findings of recent MEG studies. In addition, we review the clinical applications of MEG for sensory disturbances of the tongue caused by damage to the lingual nerve. Increased knowledge of the physiological and pathophysiological mechanisms underlying tongue sensorimotor processing may improve our understanding of the cortical entrainment of human oral functions.

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“…Readiness field typically starts 500-1000 ms before movement onset and motor field peaks after movement onset (Cheyne et al, 1991;Cheyne and Weinberg, 1989;Deecke et al, 1982). These fields may be difficult to detect because they strongly depend on the way the movement is performed, a factor potentially difficult to control in patients with motor deficits or movement disorders (Boonstra et al, 2006;Hari et al, 1983;Pollok et al, 2004).…”

Section: Introductionmentioning

confidence: 98%