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| Research article summary (published 29 Jun 2003): |
A high density ERP comparison of mental rotation and mental size transformation.
Full Abstract
To compare mental rotation and mental size transformation, 128-channel EEG was recorded while subjects performed both tasks using random two-dimensional shapes as stimuli. Behavioural results showed significant linear effects of both size transformation and mental rotation on reaction times. Rotation ERPs showed experimental effects at two latencies:
a bilateral component distributed over posterior parietal electrodes at a latency of approximately 232-300ms and a second component at approximately 424-492ms distributed over right anterior parietal electrodes. The latency and spatial distribution of this second effect is consistent with previous research indicating a functional connection between this component and mental rotation. ERPs for the size-transformation task showed an effect at 180-228ms distributed bilaterally over occipital-temporal electrodes. These results are consistent with previous hemodynamic imaging studies that show involvement of parietal cortex in mental rotation and also the involvement of BA 19 in size-transformation tasks. However, the superior temporal resolution of the present data indicates that BA 19 activation may occur at a latency that is more likely related to apparent motion than to the size-transformation operation per se.
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Author information
Author/s: Muthukumaraswamy, Suresh D (SD); Johnson, Blake W (BW); Hamm, Jeff P (JP);
Affiliation: Research Centre for Cognitive Neuroscience, Department of Psychology, University of Auckland, Auckland, New Zealand. smut008@psynov1.auckland.ac.nz
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Brain and cognition (Brain Cogn), published in United States. (Language: eng)
Reference: 2003-Jul; vol 52 (issue 2) : pp 271-80
Dates: Created 2003/06/24; Completed 2003/09/17; Revised 2006/11/15;
PMID: 12821110, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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