The chronometrics of cortical excitation as explored with auditory probes

Abstract In a series of studies we examined sensory evoked potentials to stimuli presented while subjects performed a primary task. The primary tasks were designed to induce changes in slow cortical potentials (SCP) such as P300, contingent negative variation (CNV), and postimperative negative variation (PINV). Brief auditory stimuli were presented before, during or after the primary task. The interactions between the two types of event-related potentials, SCP and the probe-evoked N 1/P2, served to further explore the nature of SCP, particularly in its relation to excitability in cortical neuronal networks. The functional state indicated by SCP was also probed in patients with a chronic schizophrenic disorder, who are known to exhibit deviant SCP. Increased amplitudes of the probe-evoked vertex potential (N 1/P2) and faster motor responses to probes during the CNV, and reduced N 1/P2-omplitudes and delayed motor responses during positive waves (P300) support the hypothesis that anticipatory cortical negativity indicates excitation in cortical neuronal networks while positive-going waves may indicate widespread cortical suppression (with focused islands of cortical excitability). Increased amplitudes of the N 1/P2 during the CNV but not during the PINV suggest a different functional significance of these two negative-going slow waves. Although schizophrenic patients displayed different amplitudes and scalp distribution, particularly of the PINV, suggesting a deviant spatia-temporal regulation of cortical excitability, the functional relation between SCP and probe-related activity was similar in schizophrenic patients and control subjects.

Fachgebiet (DDC)

150 Psychologie

Schlagwörter

Slow cortical potentials, CNV, PINV, P300, probes, AEP, schizophrenia

Zitieren

ISO 690

ROCKSTROH, Brigitte, Rudolf COHEN, Thomas ELBERT, Matthias MÜLLER, Christoph KLEIN, 1997. The chronometrics of cortical excitation as explored with auditory probes. In: Journal of Psychophysiology. 1997, 11, pp. 335-351

BibTex

@article{Rockstroh1997chron-10534,
  year={1997},
  title={The chronometrics of cortical excitation as explored with auditory probes},
  volume={11},
  journal={Journal of Psychophysiology},
  pages={335--351},
  author={Rockstroh, Brigitte and Cohen, Rudolf and Elbert, Thomas and Müller, Matthias and Klein, Christoph}
}

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