Neuroscience 2005 Abstract
| Presentation Number: | 640.16 |
|---|---|
| Abstract Title: | Coprocessing of mental rotation and memory scanning in the brain: a voxel-by-voxel analysis of 4 tesla fMRI activation. |
| Authors: |
Georgopoulos, A. P.*1,2,4
; Lewis, S. M.2,4
; Christova, P. S.1,4
; Slagle, E.4
; Ugurbil, K.1,3
1Neuroscience, Univ. of Minnesota, Minneapolis, MN 2Neurology, Univ. of Minnesota, Minneapolis, MN 3Radiology, Univ. of Minnesota, Minneapolis, MN 4MN, One Veterans Dr, 55455, |
| Primary Theme and Topics |
Cognition and Behavior - Human Cognition, Behavior, and Anatomy -- Perception and imagery |
| Session: |
640. Perception and Imagery II Poster |
| Presentation Time: | Tuesday, November 15, 2005 11:00 AM-12:00 PM |
| Location: | Washington Convention Center - Hall A-C, Board # EE3 |
| Keywords: | mental rotation, memory scanning, fMRI |
In a previous study we analyzed the fMRI neural activation patterns observed while human subjects performed mental rotation and memory scanning tasks, by assessing the overall level of activation in a region of interest (ROI) in comparison with a baseline (Tagaris et al., Functional magnetic resonance imaging of mental rotation and memory scanning: a multidimensional scaling analysis of brain activation patterns, Brain Res. Rev. 26:106-112, 1998). A major finding of that study was that many areas were involved in a differential manner in the processing of information during 4 tasks, which consisted of combinations of 2 cognitive operations (mental rotation, context-recall memory scanning) and 2 kinds of operanda (visual stimuli, direction of planned hand movement), resulting in visual mental rotation (MRV), motor mental rotation (MRM), visual memory scanning (MSV), and motor memory scanning (MSM) tasks. In this study we analyzed the potential co-processing of those tasks, on a voxel-by-voxel basis. For that purpose, we first determined, for each voxel in a ROI, whether there was a significant activation in each of the 4 tasks, and denoted the presence or absence of activation in a binary form, i.e. as 0 and 1, respectively. Then for each ROI we performed a loglinear modeling analysis which yielded partial chi-squares (and their statistical significance) for each task, 2-way, and higher-order associations among tasks. In general, 3-way and higher order associations were not significant. The tasks and their 2-way associations with significant effects differed among different ROIs. The pattern of the significant effects, in turn, provided detailed, voxel-by-voxel, information regarding the involvement of a given area in specific task characteristics.
Supported by NIH NS32919
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
Copyright © 2005-2025 Society for Neuroscience; all rights reserved. Permission to republish any abstract or part of any abstract in any form must be obtained in writing by SfN office prior to publication.
