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. 2014 Apr 25;8:251. doi: 10.3389/fnhum.2014.00251

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Copyright © 2014 Kiyama, Kunimi, Iidaka and Nakai.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Functional connectivity models between the ten ROIs within the motor association cortex during the bimanual finger movement task. The models are presented for each condition of the in-phase (model A) and anti-phase (model B) modes for the young group, and the in-phase (model C) and anti-phase (model D) modes for the elderly group. The ROIs applied to SEM as observed variables are presented in rectangles. The dependent measure was parameter estimate obtained from each ROI. Measurement error terms are not shown. M1, primary motor cortex; S1, primary somatosensory cortex; PMd, dorsal premotor cortex; SMA, supplementary motor area, SPL; superior parietal lobule, L; left, R; right. The thickness of the arrows represents the significance levels of standardized path coefficients (β) among the mean parameter estimates of the ROIs as follows: p < 0.001; p < 0.01; p ≥ 0.01.