国際ジャーナルへの論文掲載情報
Authors:
Tsubomi, H., Ikeda, T., Hanakawa, T., Hirose, N., Fukuyama, H., & Osaka, N.
Title:
Dissociable neural activations of conscious visibility and attention
Journal:
Journal of Cognitive Neuroscience
doi:
なし
論文URL:
http://www.mitpressjournals.org/loi/jocn
Abstract:
Recent neuroimaging evidence indicates that visual consciousness of
objects is reflected by the activation in the lateral occipital cortex
as well as in the frontal and parietal cortex. However, most previous
studies used behavioral paradigms in which attention raised or enhanced
visual consciousness (visibility or recognition performance). This
co-occurrence made it difficult to reveal whether an observed cortical
activation is related to visual consciousness or attention. The present
fMRI study investigated the dissociability of neural activations
underlying these two cognitive phenomena. Toward this aim, we used a
visual backward masking paradigm in which directing attention could
either enhance or reduce the object visibility. The participantsʼ task
was to report the level of subjective visibility for a briefly presented
target object. The target was presented in the center with four
flankers, which was followed by the same number of masks. Behavioral
results showed that attention to the flankers enhanced the target
visibility, whereas attention to the masks attenuated it. The fMRI
results showed that the occipito-temporal sulcus increased activation in
the attend flankers condition compared with the attend masks condition,
and occipito-temporal sulcus activation levels positively correlated
with the target visibility in both attentional conditions. On the other
hand, the inferior frontal gyrus and the intraparietal sulcus increased
activation in both the attend flankers and attend masks compared with an
attend neither condition, and these activation levels were independent
of target visibility. Taken together, present results showed a clear
dissociation in neural activities between conscious visibility and
attention.
著者Contact先の email:
htsubomi@fennel.rcast.u-tokyo.ac.jp
Tsubomi, H., Ikeda, T., Hanakawa, T., Hirose, N., Fukuyama, H., & Osaka, N.
Title:
Dissociable neural activations of conscious visibility and attention
Journal:
Journal of Cognitive Neuroscience
doi:
なし
論文URL:
http://www.mitpressjournals.org/loi/jocn
Abstract:
Recent neuroimaging evidence indicates that visual consciousness of
objects is reflected by the activation in the lateral occipital cortex
as well as in the frontal and parietal cortex. However, most previous
studies used behavioral paradigms in which attention raised or enhanced
visual consciousness (visibility or recognition performance). This
co-occurrence made it difficult to reveal whether an observed cortical
activation is related to visual consciousness or attention. The present
fMRI study investigated the dissociability of neural activations
underlying these two cognitive phenomena. Toward this aim, we used a
visual backward masking paradigm in which directing attention could
either enhance or reduce the object visibility. The participantsʼ task
was to report the level of subjective visibility for a briefly presented
target object. The target was presented in the center with four
flankers, which was followed by the same number of masks. Behavioral
results showed that attention to the flankers enhanced the target
visibility, whereas attention to the masks attenuated it. The fMRI
results showed that the occipito-temporal sulcus increased activation in
the attend flankers condition compared with the attend masks condition,
and occipito-temporal sulcus activation levels positively correlated
with the target visibility in both attentional conditions. On the other
hand, the inferior frontal gyrus and the intraparietal sulcus increased
activation in both the attend flankers and attend masks compared with an
attend neither condition, and these activation levels were independent
of target visibility. Taken together, present results showed a clear
dissociation in neural activities between conscious visibility and
attention.
著者Contact先の email:
htsubomi@fennel.rcast.u-tokyo.ac.jp
