Neuroscience 2005 Abstract
| Presentation Number: | 771.16 |
|---|---|
| Abstract Title: | Neuromagnetic responses to visually presented words with masked repetition priming. |
| Authors: |
Fujimaki, N.*1
; Hayakawa, T.1,2
; Munetsuna, S.1
; Matani, A.1
1National Inst. of Information and Communications Technology, Kobe, Japan 2Japan, 588-2 Iwaoka, 651-2492, |
| Primary Theme and Topics |
Cognition and Behavior - Human Cognition, Behavior, and Anatomy -- Language |
| Session: |
771. Language IV Poster |
| Presentation Time: | Tuesday, November 15, 2005 4:00 PM-5:00 PM |
| Location: | Washington Convention Center - Hall A-C, Board # OO11 |
| Keywords: | LANGUAGE, MEG, BRAIN IMAGING, COGNITION |
We investigated the effects of repetitive presentations on neural processing of visually presented words. A string of mask pattern #, a character string (prime), and a word (target) were sequentially displayed; the mask pattern was replaced by primes which lasted for 70 ms, and then replaced by targets. The target words consisted of five Japanese katakana (syllabogram) characters, while the primes consisted of five hiragana (syllabogram) characters that had the same sounds and meanings as the following target words (repetition priming) or consisted of five pseudo-characters (control). Subjects were required to judge whether the target words belonged to the category informed before and to respond by pressing yes or no button. 320 magnetic responses were recorded with a whole-head 148-channel MEG system. In two cases of eight (four subjects times two sessions), reaction time for the affirmative (and correct) answers was significantly shorter by 66 ms and 76 ms for the repetition priming condition than for the control condition. For three cases, the magnetic responses were larger for the repetition priming condition than for the control condition in a latency range from 400 to 600 ms. A multi-dipole analysis (Selective-Minimum-Norm) showed active neural sources at the late latencies in the areas related to phonological and semantic processes: the inferior frontal, precentral, posterior superior temporal, anterior inferior temporal, and parietal areas of the left hemisphere as well as in the areas related to visual-form and attentional processes: the occipital and ventral occipito-temporal areas and medial frontal area. The increase in magnetic responses may reflect difference in lexical processes, which was influenced by the prime words. This work was partially supported by a Grant-in-aid from the Ministry of Education, Culture, Sports, Science and Technology (No. 16300083).
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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