Visuell induzierte Gammabandaktivität im menschlichen EEG : Ausdruck corticaler Reizrepräsentation?
Visuell induzierte Gammabandaktivität im menschlichen EEG : Ausdruck corticaler Reizrepräsentation?
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1997
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Zeitschrift für Experimentelle Psychologie ; 44 (1997), 1. - pp. 186-212
Abstract
Visually induced gamma band responses in the human EEG - Expression of cortical stimulus representation?
The features of a visual stimulus are processed in different regions of the visual cortex with no direct axonal connections. Therefore, neurons in the distributed processing areas must be connected in some way to form the physiological substrate of the percept. On the basis of theoretical considerations and animal experiments, it has been proposed that synchronization of neuronal oscillatory firing patterns in the gamma band range (above 30 Hz) might be essential in linking the anatomically distant cell assemblies that represent the various features of the stimulus. The present work reports on three experiments in which the functional relevance of induced gamma band responses were investigated in the human EEG. Using an identical stimulation design, as used in animal studies, it was demonstrated that human induced gamma band responses resembled those reported from intracortical recordings from animals. It was further shown that alpha and gamma band activities differed in temporal characteristics as well as in topographical features, indicating the representation of different cortical functional states. In accordance with previous animal and human experimental findings, a complex moving stimulus was related to a suppression of induced gamma band activity as opposed to a standing complex stimulus.
The features of a visual stimulus are processed in different regions of the visual cortex with no direct axonal connections. Therefore, neurons in the distributed processing areas must be connected in some way to form the physiological substrate of the percept. On the basis of theoretical considerations and animal experiments, it has been proposed that synchronization of neuronal oscillatory firing patterns in the gamma band range (above 30 Hz) might be essential in linking the anatomically distant cell assemblies that represent the various features of the stimulus. The present work reports on three experiments in which the functional relevance of induced gamma band responses were investigated in the human EEG. Using an identical stimulation design, as used in animal studies, it was demonstrated that human induced gamma band responses resembled those reported from intracortical recordings from animals. It was further shown that alpha and gamma band activities differed in temporal characteristics as well as in topographical features, indicating the representation of different cortical functional states. In accordance with previous animal and human experimental findings, a complex moving stimulus was related to a suppression of induced gamma band activity as opposed to a standing complex stimulus.
Summary in another language
Im visuellen Cortex werden unterschiedliche Merkmale eines Objekts in spezialisierten Arealen verarbeitet, die keine direkten axonalen Verbindungen aufweisen. Daraus ergibt sich das Problem, wie die unterschiedlichen Merkmale eines Objektes wieder zu einer einheitlichen Gestalt zusammengebunden werden. Aufgrund theoretischer Modelle und tierexperimenteller Befunde wird die nicht zum Stimulus zeit- und phasengebundene synchronisierte neuronale Aktivität im sogenannten Gammaband (über 30 Hz) als grundlegender «Binding»-Mechanismus diskutiert. Ziel der vorliegenden Studien war es, durch den Vergleich tierexperimenteller und humanexperimenteller Befunde die funktionale Relevanz dieser Aktivitäten zu erhellen. Bei Verwendung identischer Stimuli wie im Tierexperiment konnten wir zeigen, daß die kohärente Bewegung eines Balkens im Vergleich zur inkohärenten Bewegung zweier Balken mit erhöhter Gammabandaktivität verbunden war. Die Aktivität war im Bereich von 380 ms nach Reizbeginn maximal ausgeprägt und somit entsprach die Latenz derjenigen, die in Tier- und jüngsten Humanexperimenten berichtet wurde. Weiterhin konnten wir zeigen, daß Alpha- und Gammabandaktivitäten sich sowohl im zeitlichen Verlauf als auch in der topographischen Verteilung unterschieden und von daher sehr wahrscheinlich unterschiedliche corticale Prozesse repräsentieren. In Übereinstimmung mit früheren tier- und humanexperimentellen Befunden führte die Bewegung eines komplexen Stimulus im Vergleich zum komplexen stehenden Stimulus in der vorliegenden Arbeit ebenfalls zu einer Reduktion der Gammabandaktivität. Mögliche Erklärungs- und weiterführende Experimentalansätze werden diskutiert.
Subject (DDC)
150 Psychology
Keywords
Induzierte Gammabandantworten,visueller Cortex,Bindungsproblem,menschliches EEG,diskrete Gabortransformation,induced gamma band response,visual cortex,binding problem,human EEG,discrete gabor transformation
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MÜLLER, Matthias M., Thomas ELBERT, Brigitte ROCKSTROH, 1997. Visuell induzierte Gammabandaktivität im menschlichen EEG : Ausdruck corticaler Reizrepräsentation?. In: Zeitschrift für Experimentelle Psychologie. 44(1), pp. 186-212BibTex
@article{Muller1997Visue-11374, year={1997}, title={Visuell induzierte Gammabandaktivität im menschlichen EEG : Ausdruck corticaler Reizrepräsentation?}, number={1}, volume={44}, journal={Zeitschrift für Experimentelle Psychologie}, pages={186--212}, author={Müller, Matthias M. and Elbert, Thomas and Rockstroh, Brigitte} }
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