Summary
A slow magnetic field shift has been detected in the human brain occurring in the foreperiod of a voluntary finger movement. This magnetic field accompanies a slow negative electrical cerebral potential which occurs in the same foreperiod, the Bereitschaftspotential (BP) of Kornhuber and Deecke. The present report is the first of a magnetic field associated with the BP, and has been named the Bereitschaftsmagnetfeld (BM) or readiness magnetic field. The BM is oriented with the field lines directed out of the head in the pre-rolandic region and with the field lines directed into the head in post-rolandic areas, suggesting a source in the sensorimotor area for the contralateral hand. Distribution of the magnetic fields has so far not revealed a source in the fronto-central midline where the BP is recorded maximally. The time course and morphology of the BP and BM are similar, but they have different topography over the skull.
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References
Brenner D, Williamson SJ, Kaufman L (1975) Visually evoked magnetic fields of the human brain. Science 190: 480–482
Cohen D (1972) Magnetoencephalography: Detection of the brain's electrical activity with a superconducting magnetometer. Science 175: 664–666
Deecke L, Kornhuber HH (1978) An electrical sign of participation of the mesial ‘supplementary’ motor cortex in human voluntary movement. Brain Res 159: 473–476
Deecke L, Grözinger B, Kornhuber HH (1976) Voluntary finger movement in man: Cerebral potentials and theory. Biol Cybern 23: 99–119
Grözinger B, Kriebel J, Kornhuber HH (1974) Respiration correlated brain potentials. J Interdiscip Cycle Res 5: 287–294
Kornhuber HH, Deecke L (1965) Hirnpotentialänderungen bei Willkürbewegungen und passiven Bewegungen des Menschen: Bereitschaftspotential und reafferente Potentiale. Pfluegers Arch 248: 1–17
Lassen NA, Ingvar DH, Skinhøj E (1978) Brain function and blood flow. Sci Am 239: 62–71
Okada Y, Williamson SJ, Kaufman L (1982) Magnetic field of the human sensorimotor cortex. Cited in: Kaufman L, Williamson SJ (eds) Magnetic location of cortical activity. NY Acad Sci (in press)
Roland PE, Larsen B, Lassen NA, Skinhøj E (1980) Supplementary motor area and other cortical areas in organization of voluntary movement in man. J Neurophysiol 43: 118–136
Vrba J, Fife AA, Burbank MB, Weinberg H, Brickett PA (1982) Spatial discrimination in SQUID gradiometers and third order gradiometer performance. Can J Phys 60: 1–12
Weinberg H, Brickett PA, Vrba J, Fife AA, Burbank MB The use of a SQUID third order spatial gradiometer to measure magnetic fields of the brain. Ann NY Acad Sci (in press)
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Supported by grants from the Secretariat on Science Research and Development and the Programmes of Distinction of British Columbia, Canada
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Deecke, L., Weinberg, H. & Brickett, P. Magnetic fields of the human brain accompanying voluntary movement: Bereitschaftsmagnetfeld. Exp Brain Res 48, 144–148 (1982). https://doi.org/10.1007/BF00239582
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DOI: https://doi.org/10.1007/BF00239582