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Magnetic brain activity evoked and induced by visually presented words and nonverbal stimuli

Published online by Cambridge University Press:  01 July 2000

CARSTEN EULITZ ,
HIND EULITZ ,
BURKHARD MAESS ,
RUDOLF COHEN ,
CHRISTO PANTEV  and
THOMAS ELBERT
CARSTEN EULITZ
Affiliation:
Department of Psychology, University of Konstanz, Germany Institute for Experimental Audiology, University of Münster, Germany
HIND EULITZ
Affiliation:
Department of Psychology, University of Konstanz, Germany
BURKHARD MAESS
Affiliation:
Max-Planck-Institute for Cognitive Neuroscience, Leipzig, Germany
RUDOLF COHEN
Affiliation:
Department of Psychology, University of Konstanz, Germany
CHRISTO PANTEV
Affiliation:
Institute for Experimental Audiology, University of Münster, Germany
THOMAS ELBERT
Affiliation:
Department of Psychology, University of Konstanz, Germany
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Abstract

Evoked and induced magnetic brain activity measured over the left hemisphere were tested for their specificity to language-related processing. Induced activity refers to oscillatory alterations time locked but not phase locked to the stimulus. Words, false font stimuli, and two types of nonverbal patterns were presented visually while subjects performed a nonlinguistic visual feature detection task. The comparison of evoked and induced brain activity around 200 ms after stimulus onset revealed differential sensitivity to the stimuli. The M180 component of the evoked magnetic field was larger at the processing of words and false font stimuli compared with nonverbal stimuli. The induced magnetic brain activity in the 60-Hz band at a compatible latency range was correlated with the familiarity of the visual Gestalt. Sensitivity to language-specific information processing can be concluded if a parameter differentiates the word condition from the nonlexical conditions. Such a difference was observed at sensors located over the frontal-temporal scalp regions for induced but not evoked magnetic brain activity. Thus, evoked and induced magnetic brain activity revealed a differential sensitivity to elements of cognitive processing during the given task.

Keywords

MEGVisual evoked magnetic fieldLanguageLexical processingGammaband activityOscillatory brain activity
Type
Research Article
Information
Psychophysiology , Volume 37 , Issue 4 , July 2000 , pp. 447 - 455
Copyright
2000 Society for Psychophysiological Research

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