国際ジャーナルへの論文掲載情報
Authors:
Matsuyoshi, D., Ikeda, T., Sawamoto, N., Kakigi, R., Fukuyama, H., &
Osaka, N.
Title:
Differential roles for parietal and occipital cortices in visual working
memory.
Journal:
PLoS ONE
doi:
10.1371/journal.pone.0038623
論文URL:
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0038623
Abstract:
Visual working memory (VWM) is known as a highly capacity-limited
cognitive system that can hold 3-4 items. Recent studies have
demonstrated that activity in the intraparietal sulcus (IPS) and
occipital cortices correlates with the number of representations held in
VWM. However, differences among those regions are poorly understood,
particularly when task-irrelevant items are to be ignored. The present
fMRI-based study investigated whether memory load-sensitive regions such
as the IPS and occipital cortices respond differently to task-relevant
information. Using a change detection task in which participants are
required to remember pre-specified targets, here we show that while the
IPS exhibited comparable responses to both targets and distractors, the
dorsal occipital cortex manifested significantly weaker responses to an
array containing distractors than to an array containing only targets,
despite that the number of objects presented was the same for the two
arrays. These results suggest that parietal and occipital cortices
engage differently in distractor processing and that the dorsal
occipital, rather than parietal, activity appears to reflect output of
stimulus filtering and selection based on behavioral relevance.
著者Contact先の email:
nosaka@bun.kyoto-u.ac.jp
Matsuyoshi, D., Ikeda, T., Sawamoto, N., Kakigi, R., Fukuyama, H., &
Osaka, N.
Title:
Differential roles for parietal and occipital cortices in visual working
memory.
Journal:
PLoS ONE
doi:
10.1371/journal.pone.0038623
論文URL:
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0038623
Abstract:
Visual working memory (VWM) is known as a highly capacity-limited
cognitive system that can hold 3-4 items. Recent studies have
demonstrated that activity in the intraparietal sulcus (IPS) and
occipital cortices correlates with the number of representations held in
VWM. However, differences among those regions are poorly understood,
particularly when task-irrelevant items are to be ignored. The present
fMRI-based study investigated whether memory load-sensitive regions such
as the IPS and occipital cortices respond differently to task-relevant
information. Using a change detection task in which participants are
required to remember pre-specified targets, here we show that while the
IPS exhibited comparable responses to both targets and distractors, the
dorsal occipital cortex manifested significantly weaker responses to an
array containing distractors than to an array containing only targets,
despite that the number of objects presented was the same for the two
arrays. These results suggest that parietal and occipital cortices
engage differently in distractor processing and that the dorsal
occipital, rather than parietal, activity appears to reflect output of
stimulus filtering and selection based on behavioral relevance.
著者Contact先の email:
nosaka@bun.kyoto-u.ac.jp
