Judging semantic and episodic incongruity: a magnetoencephalographic study.
Evoked magnetic fields over the entire head were measured during a semantic judgment task, in which conditions of the pre-test learning session were manipulated. Subjects learnt related and unrelated category-noun pairs, and were then asked to judge the relationship between category and noun. Unrelated pairs evoked activation around 400 ms in the left temporal area. In addition, newly presented related pairs, of which the categories were used to learn unrelated pairs, also evoked similar activities. Our findings suggest that these activities are not only related to the semantic incongruity between a pair of words as in previous studies, but also to the episodic incongruity between the learning and measurement sessions.
Suzuki
K
K
Department of Disability Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan.
Okuda
J
J
Otsuka
Y
Y
Sugawara
A
A
Hatanaka
K
K
Nakasato
N
N
Kanno
A
A
Yoshimoto
T
T
Fujii
T
T
Yamadori
A
A
D000328:Adult; D000704:Analysis of Variance; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D008568:Memory / Q000502:physiology*; D012660:Semantics; D013067:Speech Perception / Q000502:physiology; D013702:Temporal Lobe / Q000502:physiology*; D014706:Verbal Learning / Q000502:physiology*