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Cerebral Cortex Advance Access originally published online on May 13, 2004
Cerebral Cortex 2004 14(12):1376-1383; doi:10.1093/cercor/bhh098
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© Oxford University Press 2004

Article

Mental Visual Synthesis is Originated in the Fronto-temporal Network of the Left Hemisphere

Yukihito Yomogida1, Motoaki Sugiura2, Jobu Watanabe2,3, Yuko Akitsuki2,4, Yuko Sassa2,3, Teruyuki Sato1, Yoshihiko Matsue5 and Ryuta Kawashima2

1 Tohoku University School of Medicine, Sendai 980-8575, Japan, 2 NICHe, Tohoku University, Sendai 980-8579, Japan, 3 LBC Research Center, Tohoku University 21st Century Center of Excellence Program in Humanities, Sendai 980-8576, Japan, 4 Department of Psychiatry, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan, 5 Kansei Fukushi Research Center, Tohoku Fukushi University, Sendai 989-3201, Japan

Mental visual synthesis is the capacity for experiencing, constructing, or manipulating ‘mental imagery’. To investigate brain networks involved in mental visual synthesis, brain activity was measured in right-handed healthy volunteers during mental imagery tasks, in which the subjects were instructed to imagine a novel object, that does not exist in the real world, by composing it from two visually presented words associated with a real object or two achromatic line drawings of a real object, using functional magnetic resonance imaging (fMRI). Both tasks activated the same areas in the inferior frontal and inferior temporal cortices of the left hemisphere. Our results indicate that the source of mental visual synthesis may be formed by activity of a brain network consisting of these areas, which are also involved in semantic operations and visual imagery.


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