14th International Congress of Phonetic Sciences (ICPhS-14) San Francisco, CA, USA August 1-7, 1999

Temporal and Spatial Brain Activities Reflected in Independent Components of Event-Related Magnetic Fields during Vowel Perception

Shinobu Masaki (1), Shinji Maeda (2), Kiyoshi Honda (1), Kazumi Aoyama (3)

(1) ATR Human Information Processing Research Laboratories, Kyoto, Japan
(2) Ecole Nationale Supérieure des Télécommunications and Centre National de la Recherche Scientifique, Paris, France,
(3) Waseda University, Tokyo, Japan

Magnetoencephalographic (MEG) data of brain activities are recorded during vowel perception tasks. We discuss the location active regions estimated by an equivalent current dipole (ECD) matching, Nl OOm latencies, and spatiotemporal decomposition using a singular value decomposition or independent component analysis (ICA) technique. Although ECDs exhibited a vowel map consistent across subjects, it didn't correspond to the phonetic pattern of vowels. So far, only the ICA seems to indicate vowel specific temporal patterns which can be interpreted by the phonological feature [front/back].

Full Paper

Bibliographic reference.  Masaki, Shinobu / Maeda, Shinji / Honda, Kiyoshi / Aoyama, Kazumi (1999): "Temporal and spatial brain activities reflected in independent components of event-related magnetic fields during vowel perception", In ICPhS-14, 2073-2076.