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

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 pa...

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Bibliographic Details
Published in:Psychophysiology 2000-07, Vol.37 (4), p.447-455
Main Authors: EULITZ, CARSTEN, EULITZ, HIND, MAESS, BURKHARD, COHEN, RUDOLF, PANTEV, CHRISTO, ELBERT, THOMAS
Format: Article
Language:English
Subjects:
Adult
Anatomical correlates of behavior
Behavioral psychophysiology
Biological and medical sciences
Cerebral Cortex - physiology
Electroencephalography
Female
Fundamental and applied biological sciences. Psychology
Gammaband activity
Gestalt Theory
Humans
Language
Lexical processing
Magnetoencephalography
Male
MEG
Oscillatory brain activity
Photic Stimulation
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Visual evoked magnetic field
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Summary: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.
ISSN:0048-5772
1469-8986
1540-5958
DOI:10.1111/1469-8986.3740447