国際ジャーナルへの論文掲載情報

EEG and fMRI Measurement

Journal(書誌情報）:
Journal of Cognitive Neuroscience

doi:
10.1162/jocn_a_00493

論文URL:
http://www.mitpressjournals.org/doi/abs/10.1162/jocn_a_00493

Abstract:
Previous studies have suggested that the posterior parietal cortices and premotor areas are 

involved in mental image transformation. However, it remains unknown whether these regions 

really cooperate to realize mental image transformation. In this study, simultaneous EEG and 

fMRI were performed to clarify the spatio-temporal properties of neural networks engaged in

 mental image transformation. We adopted a modified version of the mental clock task used 

by Sack et al. [Sack, A. T., Camprodon, J. A., Pascual-Leone, A., & Goebel, R. The dynamics 

of interhemispheric compensatory processes in mental imagery. Science, 308, 702-704, 2005; 

 Sack, A. T., Sperling, J. M., Prvulovic, D., Formisano, E., Goebel, R., Di Salle, F., et al. 

Tracking the mind's image in the brain II: Transcranial magnetic stimulation reveals parietal 

asymmetry in visuospatial imagery. Neuron, 35, 195-204, 2002]. In the modified mental clock 

task, participants mentally rotated clock hands from the position initially presented at a learned 

speed for various durations. Subsequently, they matched the position to the visually presented 

clock hands. During mental rotation of the clock hands, we observed significant beta EEG 

suppression with respect to the amount of mental rotation at the right parietal electrode. 

The beta EEG suppression accompanied activity in the bilateral parietal cortices and left 

 premotor cortex, representing a dynamic cortical network for mental image transformation. 

These results suggest that motor signals from the premotor area were utilized for mental image 

transformation in the parietal areas and for updating the imagined clock hands represented in 

 the right posterior parietal cortex.

著者Contact先の email:
sasaoka@i.kyoto-u.ac.jp