Technical requirements for high-quality scalp DC recordings

Bauer, Herbert; Korunka, Christian; Leodolter, M.

doi:10.1016/0013-4694(89)90232-0

Cited by 123 publications

(34 citation statements)

References 5 publications

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“…In order to record the SCP changes that accompany task processing during the experiments, 22 Ag/AgCl electrodes were attached to the scalp using electrode adapters and collodion glue (see Bauer et al, 1989) at the approximately equidistant locations Fp1Ј, Fp2Ј/F7Ј, F3Ј, Fz, F4Ј, F8Ј/T3Ј, C3Ј, Cz, C4Ј, T4Ј/T5Ј, P3Ј, Pz, P4Ј, T6Ј/O1Ј, Oz, O2Ј/M1, M2; marked positions corresponding only approximately to the international 10 -20 electrode system locations. In order to achieve similar montages across subjects, an individually adjustable "application cap" (grid of elastic bands) was used to keep electrode adapters in place during the gluing process (Bauer, 1998).…”

Section: Methodsmentioning

confidence: 99%

“…After removing the application cap, 3D coordinates of all electrode adapter locations were measured by means of a photogrammetric 3D scanner (3D-PHD; Bauer et al, 2000). The skin was scratched at each location, the adapter filled with degassed electrolyte, and an electrode, prefilled with electrolyte, was attached (Bauer et al, 1989). This method assured electrode impedance values of Յ1k⍀ and, together with the equipment, sufficiently stable DC-EEG recordings.…”

Section: Methodsmentioning

confidence: 99%

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Functional neuroanatomy of learned helplessness

et al. 2003

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In the experiments reported here, female subjects were presented with reasoning tasks that changed from solvable to unsolvable, evoking "learned helplessness" or "loss of control" reactions in some subjects. Significant differences in slow cortical potential (SCP) changes were found between emotionally highly and lowly reactive subjects (grouped according to responses in postexperimental questionnaires) when processing unsolvable tasks. Cortical LORETA (Pascual-Marqui, 1999) of SCP topographies (Bauer, 1998;Bauer et al., 2000) and subsequent statistical nonparametric mapping (SnPM; Nichols and Holmes, 2002) analysis indicate clear reduction of anterior cingulate activity only with emotionally highly reactive subjects. In these subjects a region of the brain that is indispensable for goal-directed handling of tasks was switched off, whereas regions that are primarily engaged in processing the task stimuli were even more active during loss of control, although not at a statistically significant level. According to Carter et al. (1999) the anterior cingulate monitors the conflicts among brain regions and issues calls for further processing to the PFC that then guides behavior toward a goal. Learned helplessness might then be seen a state in which the function of the anterior cingulate is no longer maintained, perhaps due to the inhibitory influence of the amygdala possibly mediated via the brainstem dopaminergic ventral tegmental area (Davis et al., 1994;Goldstein et al., 1996).

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Functional neuroanatomy of learned helplessness

et al. 2003

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“…If some channels drifted, maps would change dramatically and become uninterpretable. Bauer, Korunka, and M. Leodolter (1989) summarized the important aspects. However, some of these that directly influence baseline stability should be emphasized once more.…”

Section: Practical Significance For Cognitive Neurosciencementioning

confidence: 99%

“…The frame is kept in place by means ofa chest belt. Using Velcro, a net made of elastic bands can be fastened over the head in such a way that adapters (Bauer et al, 1989) for all electrodes can be kept in place simultane- ously (see Figure 3). After securing all electrode adapters by collodion, the elastic net and the head frame are removed, and all adapters will be in place.…”

Section: Practical Significance For Cognitive Neurosciencementioning

confidence: 99%

Slow potential topography

Bauer

1998

Behavior Research Methods, Instruments, & Computers

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“…are bioelectrical signals which occupy the extreme, low-end Despite the utility of DC potentials, most studies of cerebral of the frequency spectrum (Gumnit 1974). Direct Current field potentials have focused on the electroencephalogram potentials reflect the state of activity of central nervous cells, (EEG) or the evoked potential (EP), perhaps due to technical and shifts in these potentials have been associated with the difficulties which must be overcome in DC measurement depolarization of underlying neurons (Speckmann and Elger (Hillyard 1974;Speckmann and Elger 1982;Bauer et al 1989Bauer et al ). 1982).…”

Section: Introductionmentioning

confidence: 99%

Changes in direct current potentials during sleep deprivation

Bonato

Armitage

Wimmer

1996

Journal of Sleep Research

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SUMMARY Previous research reported changes in steady-state brain electrical activity during sleep. However, due to the quasi-linear nature of the Direct Current (DC) changes, artifact contamination was a potential confound. The present study was performed to further explore DC potentials and to help establish its validity. Twenty-five male university students (13 control and 12 sleep-deprived; mean age 19 y (range 17-27 y) served as subjects. During wakefulness, subjects were tested every hour while standard EEG activity recordings were made, as well as DC measurement. Split plot analyses of variance (ANOVAs) revealed that changes in DC activity levels differed between the two groups. The control subjects showed the same pattern of decreasing DC observed previously with a return to baseline levels during waking hours. The sleep-deprived subjects showed a smaller decrease in DC level through the night, followed by a rise in DC level that continued until the end of the 24 h study. It was concluded that DC measurement reflects changes in brain state associated with fatigue that are not attributable to artifactual processes. direct current potentials, electro-physiology, fatigue, sleep deprivation

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Technical requirements for high-quality scalp DC recordings

Cited by 123 publications

References 5 publications

Functional neuroanatomy of learned helplessness

Functional neuroanatomy of learned helplessness

Slow potential topography

Changes in direct current potentials during sleep deprivation

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