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The Journal of Neuroscience, March 30, 2005, 25(13):3287-3293; doi:10.1523/JNEUROSCI.4948-04.2005
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Behavioral/Systems/Cognitive
High-Frequency-Band Activity in the Basal Temporal Cortex during Picture-Naming and Lexical-Decision Tasks
Kazuyo Tanji,1,2 Kyoko Suzuki,2 Arnaud Delorme,3 Hiroshi Shamoto,4 andNobukazu Nakasato4 1Graduate School of International Cultural Studies and 2Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku University, Sendai 980-8576, Japan, 3Computational Neurobiology Laboratory, Salk Institute for Biological Studies, La Jolla, California 92037, and 4Department of Neurosurgery, Kohnan Hospital, Sendai 982-8523, Japan
-Band activity (GBA) in electroencephalograms (EEGs) has been shown to reflect various cognitive processes. GBA has typically been recorded in the 30-60 Hz range in scalp EEGs. Recently, task-related "high GBA" (HGBA) with frequencies up to 100 Hz has been observed in studies with invasive electrocorticograms (ECoGs). In the present study, we recorded ECoGs from the bilateral basal temporal cortices in a patient with epilepsy and evaluated the task-related HGBA (most prominently in the 80-120 Hz range) accompanying picture-naming and lexical-decision tasks. We examined picture naming using two categories (line drawings of animals and tools). The lexical-decision task was performed using words and pseudowords of two distinct Japanese writing forms, kanji (morphograms) and kana (syllabograms). Task-related HGBA was observed bilaterally during the naming task. Recordings from some electrodes revealed significant differences in HGBA between animal and tool pictures. In contrast to the naming task, there was apparent left dominance in the lexical-decision task. Furthermore, significant differences in HGBA were observed between the Japanese kanji and kana words and between the kanji words and kanji pseudowords. A number of differences in the HGBA observed in the recordings from the basal temporal area were consistent with previous findings from neuroimaging and patient studies and suggest that HGBA is a good correlate of visual cognitive functions.
Key words: dyslexia;
Received Aug 5, 2004; revised January 26, 2005; accepted February 6, 2005.
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