On Balancing Superconducting Gradiometric Magnetometers

Aittoniemi, K.; Karp, P.; Katila, T.; Kuusela, M L; Varpula, Timo

doi:10.1051/jphyscol:19786541

Cited by 11 publications

(1 citation statement)

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“…The component of the magnetic field perpendicular to the skull was measured with a first-order differential SQUID magnetometer (13). The diameter of the pickup coil was 2 cm and it was situated approximately 2 cm above the scalp, the intercoil distance being 14 cm.…”

Section: Methodsmentioning

confidence: 99%

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: Methodsmentioning

confidence: 99%