Abstract
To estimate genetic influences on cerebral language function, we conducted a twin analysis to investigate the similarities of cerebral oscillatory changes using magnetoencephalography (MEG). Twenty-eight monozygotic (MZ) and nine dizygotic (DZ) twins participated in this study. Brain activities were measured during a verb generation task using MEG, and the spatiotemporal distributions of task-related cerebral oscillatory changes (ERS/ERD) were investigated using an adaptive beamformer and a group statistical analysis. After the detection of ERD peak coordinates at 25–50 Hz, we estimated the power of the ERD in the peak coordinates using a time–frequency analysis. To compare the similarities in the power of the ERD, the correlation coefficients of the powers between the members of each twin were determined. The ERD peak was estimated in the left frontal area based on the group statistical analysis. In the peak coordinate, the ERD power showed a significantly higher correlation among MZ twins compared with that among DZ twins. The ERDs in the left frontal area of MZ twins were highly similar. These findings suggested that cerebral language activities in the left frontal area during a language task were genetically influenced.
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