"Probing" the nature of the CNV

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Elbert_1993_Probing.pdf
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1993
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Müller, Matthias
Wagner, Michael
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A widespread depolarization in the dendritic trees of cortical pyramidal neurons generates surface-negative potentials. In turn, such potentials may indicate facilitatory processes while positive-going waves may result from a lowering in cortical excitability. Accordingly, we may expect the processing of "probe" stimuli presented during surface-positive waves, i.e., during phases of lesser excitability, to be inhibited and probes presented during surface-negative waves to be facilitated. This hypothesis was tested by presenting acoustic probe stimuli at various points in time during a forewarned reaction time task. The warming stimulus (WS) elicited a late positive complex followed by a negative slow potential shift (CNV). In 75% of the total of 120 trials a probe could be presented 1.5 sec prior to the WS interval, 0.5, 1, 1.5 or 2 sec after the onset of the 3 sec visual WS, and 3 sec following the imperative signal (WS offset, requiring a fast button press response), while 25% of the trials were without any probe. Only one probe occurred during a trial. The EEG was recorded along the midsagittal line; responses to the probes were evaluated by reaction time (RT) and probe-evoked potentials. RT to probes presented late in the anticipatory interval were speeded up and probe-evoked potentials were enhanced during this interval, in parallel to the development of the slow potential and the CNV in particular. Results suggest that probe stimuli presented during the development of the CNV were processed more intensely, thereby supporting the hypothesis that slow cortical potentials indicate the timing of excitability in cortical neuronal networks. Such a tuning mechanism may serve as a basis for attentional regulation.

Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
150 Psychologie
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Slow cortical potentials, Contingent negative variation, Vertex potential, NlOO, Probes, Dual task, Attention
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ISO 690ROCKSTROH, Brigitte, Matthias MÜLLER, Michael WAGNER, Rudolf COHEN, Thomas ELBERT, 1993. "Probing" the nature of the CNV. In: Electroencephalography and clinical Neurophysiology. 1993, 87(4), pp. 235-241. ISSN 1388-2457. Available under: doi: 10.1016/0013-4694(93)90023-O
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@article{Rockstroh1993Probi-10290,
  year={1993},
  doi={10.1016/0013-4694(93)90023-O},
  title={"Probing" the nature of the CNV},
  number={4},
  volume={87},
  issn={1388-2457},
  journal={Electroencephalography and clinical Neurophysiology},
  pages={235--241},
  author={Rockstroh, Brigitte and Müller, Matthias and Wagner, Michael and Cohen, Rudolf and Elbert, Thomas}
}
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