Cerebral laterality differences in handedness: A mental rotation study with NIRS

Nobuaki Shimoda, Kotaro Takeda, Itsuki Imai, Junichiroh Kaneko, Hiroyuki Kato

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


Spatial cognition is right-hemisphere dominant in right-handers, but hemispheric laterality in left-handers is not fully understood. Using near-infrared spectroscopy, we compared cerebral activations in the frontal and parietal lobes during a mental rotation task between seven healthy right-handed and seven healthy left-handed women. Cerebral laterality during the spatial cognition task was evaluated as balance in the extent of activation areas between the two cerebral hemispheres, using the right-hemispheric dominance index (RI). RIs of right-handers showed right-hemispheric dominance (RI > 0) in both frontal (RI = 0.31 ± 0.25) and parietal (RI = 0.28 ± 0.37) lobes, while left-handers showed slight left-hemispheric dominance (RI < 0) in both frontal (RI = -0.13 ± 0.18) and parietal (RI = -0.22 ± 0.22) lobes. The left-handers exhibited significantly larger amplitudes of activation at the channels overlying the left-superior parietal lobule, whereas the right-handers did not show such amplitude differences. These findings suggest a difference in cerebral hemispheric laterality for spatial cognition between left- and right-handers.

Original languageEnglish
Pages (from-to)43-47
Number of pages5
JournalNeuroscience Letters
Issue number1
Publication statusPublished - 03-01-2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Neuroscience


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