Prefrontal theta oscillations associated with hand movements triggered by warning and imperative stimuli in the monkey.
In order to investigate the functional significance of theta oscillations in the brain, we recorded the cortical field potential in monkeys engaged in a visually-initiated hand movement task. In each trial a warning signal (S1) was followed 3 s later by an imperative signal (S2) to which the monkey had to respond to get a reward. The theta power in the prefrontal area 9 and the prelimbic area 32 was higher in the S1-S2 interval than in the pre-S1 period. This theta activity may be related to attentional processes and is probably a homologue of the human frontal midline theta (Fm theta) rhythms.
Department of Integrative Brain Science, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan. tujimoto@nips.ac.jp
Toru
T
Tsujimoto
Hideki
H
Shimazu
Yoshikazu
Y
Isomura
Kazuo
K
Sasaki
D000200:Action Potentials / Q000502:physiology; D000818:Animals; D001288:Attention / Q000502:physiology*; D001683:Biological Clocks / Q000502:physiology*; D003071:Cognition / Q000502:physiology; D005260:Female; D006179:Gyrus Cinguli / Q000502:physiology; D006225:Hand / Q000294:innervation / Q000502:physiology; D008251:Macaca; D008297:Male; D009068:Movement / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods; D017397:Prefrontal Cortex / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D013826:Theta Rhythm