Advertisement

PC-Supported 64-Channel DC-EEG Amplifier

  • G. Lindinger
  • P. Svasek
  • W. Lang
  • L. Deecke
Part of the Lecture Notes in Medical Informatics book series (LNMED, volume 45)

Abstract

For investigation of cortical DC-potential shifts a new, computer based multi-channel amplifier system was developed. Because of high input impedance (>50GΩ), low input bias current (<1pA) and low input capacity (<50pF) the amplifier can be used for epicortical, intracranial and intracellular recordings too. There are no analog outputs, the amplified signals were digitalized by a 16-Bit A/D in each channel of the amplifier, then online digitally filtered and after downsampling stored on the hard disk of a PC. All setups, calibration etc. are done by control of the PC. Other important new features are the capability of self testing (preamplifiers, amplifier setup), of testing electrodes (drift, noise etc.) and a computer controlled electrode application system.

Keywords

Supplementary Motor Area Digital Signal Processor High Input Impedance Main Amplifier Volitional Action 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Bauer H, Korunka C, Leodolter M (1989) Technical requirements for high-quality scalp DC recordings. Electroenceph Clin Neurophysiol 72: 545–547CrossRefGoogle Scholar
  2. [2]
    Baumgartner C, Sutherling WW, Di S, Barth DS (1989) Investigation of multiple simultaneously active brain sources in the electroencephalogram. J Neurosci Meth 30: 175–184CrossRefGoogle Scholar
  3. [3]
    Deecke L (1987) Bereitschaftspotential as an indicator of movement preparation in supplementary motor area and motor cortex. In: Porter R (ed) Motor areas of the cerebral cortex. Wiley, Chicester pp. 231–250 (Ciba Foundation Symposium 132 )Google Scholar
  4. [4]
    Kornhuber HH, Deecke L, Lang W, Lang M, Kornhuber A (1989) Will, volitional action, attention and cerebral potentials in man. Bereitschaftspotential, performance-related potentials, directed attention potentials, EEG spectrum changes. In: Hershberger WA (ed) Volitional action. Advances in Psychology, vol 62, Elsevier, Amsterdam New York, pp. 107–169CrossRefGoogle Scholar
  5. [5]
    Hjorth, B. (1975) An on-line transformation of EEG scalp potentials into into orthogonal source derivations. Electroenceph. clin. Neurophysiol., 39: 526–530CrossRefGoogle Scholar
  6. [6]
    Lang W, Obrig H, Lindinger G, Cheyne D, Deecke L (1990) Supplementary motor area activation while tapping bimanually different rhythms in musicians. Exp Brain Res, vol 76 (3)Google Scholar
  7. [7]
    Lindinger G, Lang W, Obrig H, Deecke L (1990) Topographical analyses of radial current density - Distribution of cortical DC- activation in motor tasks. In: Brunia CHM, Gaillard AWK, Kok A, Mulder G, Verbaten MN (eds) Proceedings of the Ninth International Conference on Event-Related Potentials of the Brain, EPIC I X. Tilburg University, TilburgGoogle Scholar
  8. [8]
    Nunez P (1981) Electric fields of the brain. The neurophysics of EEG. Oxford University, OxfordGoogle Scholar
  9. [9]
    Nunez P (1986) Locating sources of the brain’s electrical and magnetic fields: some effects of inhomogeneity and multiple sources, with implications for the future. HFOSL technical Note 71-86-12, San DiegoGoogle Scholar
  10. [10]
    Perrin F, Bertrand O, Pernier J (1987) Scalp current density mapping: value and estimation from potential data. IEEE Trans Biomed Eng BME-34: 238–288Google Scholar
  11. [11]
    Scherg M, von Cramon D (1986) Evoked dipole source potentials of the human auditory cortex. Electroenceph Clin Neurophysiol 65: 344–360CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • G. Lindinger
    • 1
  • P. Svasek
    • 2
  • W. Lang
    • 1
  • L. Deecke
    • 1
  1. 1.Neurologische Universitätsklinik WienWienAustria
  2. 2.Inst. f. Allgem. Elektrotechnik und ElektronikTU WienWienAustria

Personalised recommendations