Department   Undergraduate School  , School of Science and Technology
   Position   Professor
Language English
Publication Date 2019/01
Type Academic Journal
Peer Review Peer reviewed
Title Utilization of the Frontoparietal Cortical Network Determines Individual Differences in Working Memory Capacity
Contribution Type Co-authored (other than first author)
Journal Advanced Biomedical Engineering
Journal TypeAnother Country
Publisher Japanese Society for Medical and Biological Engineering
Volume, Issue, Page 8,pp.23-29
Author and coauthor H. S. Gan, T. Suzuki, K. Yokosawa, Y. Ono
Details Individual capacity of recall memory varies greatly, even in healthy young adults. Nevertheless, the difference in brain circuitry underlying varied memory capacity has yet to be fully investigated. We acquired electroencephalographic meas-urements of 43 healthy young adults who performed a demanding working memory task and studied the changes in re-gional cortical activity in relation to different memory performances. The memory task involved the sequential presenta-tion of seven arrow pictures to encode and the participants were required to report the direction of one of the arrows in the sequence within the retrieval period. We divided the participants into three groups of high-, intermediate-, and low-performance based on the weighted hierarchical grouping method. Regional brain activities were source-localized using the multiple sparse priors method in the high- and low-performance groups and group differences were determined by non-parametric permutation tests. Our findings showed that participants with higher memory performance exhibited wider distribution of cortical activity including the prefrontal and parieto-posterior cortices whereas lower performance participants only exhibited stable activations across occipital regions. The results implied the importance of selective attention in order to attain optimal individual working memory performance. Furthermore, we suggest the potential role of the angular gyrus as an interplay between the prefrontal and posterior regions for the management of stimulus flow and signal control. Future works shall focus on conducting more thorough connectivity analysis to investigate the relationship of cortical activations related to individual working memory performance.
URL for researchmap https://doi.org/10.14326/abe.8.23