Speech comprehension assessed by electroencephalography: a new method using m-sequence modulation.
Electroencephalograms (EEGs) were recorded from eight Japanese speakers while they listened to Japanese and Spanish sentences (approximately 51s each). The sentences were modulated in amplitude by a binary m-sequence and played forward or backward. A circular cross-correlation function was computed between the EEG signals and the m-sequence and averaged across subjects. Independent component analysis of the averaged function revealed a component source response which was obtained only for the comprehensible Japanese and not for the incomprehensible sentences. The present study has thus shown that a 1-min long EEG signal is sufficient for the assessment of speech comprehension.
Takeichi
Hiroshige
H
Laboratory for Advanced Brain Signal Processing, Brain Science Institute, RIKEN, Hirosawa 2-1, Wako, Saitama, Japan. takeichi@riken.jp
Koyama
Sachiko
S
Matani
Ayumu
A
Cichocki
Andrzej
A
D000161:Acoustic Stimulation; D000328:Adult; D001931:Brain Mapping; D032882:Comprehension / Q000502:physiology*; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008297:Male; D010700:Phonetics; D013060:Speech; D013061:Speech Acoustics