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Brain, Vol. 117, No. 6, 1231-1239, 1994
© 1994 Guarantors of Brain

research-article

Functional cooperativity of human cortical motor areas during self-paced simple finger movements A high-resolution MRI study

H. Boecker1,2, A. Kleinschmidt1,3, M. Requardt1, W. Hanicke1, K. D. Merboldt1 and J. Frahm1,

1Biomedizinische NMR Forschungs GmbH am Max-Planck-Institut fr biophysikalische Chemie Göttingen 2Neurologische Klinik, Klinikum rechts der Isar, Technische Universität Mnchen 3Neurologische Klinik, Heinrich-Heine-Universität Dsseldorf, Germany

Correspondence to: Correspondence to: J. Frahm, Biomedizinische NMR Forschungs GmbH am Max-Planck-Institut fr biophysikalische Chemie, Postfach 2841, D-37018 Gottingen, Germany

Magnetic resonance imaging of changes in cerebral blood oxygenation (CBO) delineated areas of neural activation during self-paced unilateral middle finger tapping in five normal volunteers. Four contiguous imaging sections parallel to the bicommissural plane covered the hand area of the primary sensori-motor cortex bilaterally. All measurements were performed at 2.0 T using rapid gradient-echo sequences (TR/TE = 63/60 ms) with high spatial resolution (0.8x1.6x 4 mm) and both strong (40° flip angle) and weak (10°) radiofrequency excitation pulses. This allows differentiation of flow and CBO contributions to the observed signal alterations. Functional cooperativity was analysed by a pixel-by-pixel correlation of signal intensity time courses with the stimulus protocol. Areas of activation included the contralateral primary motor cortex, the homologue part of the primary sensory cortex, the supplementary motor area (SMA) and the lateral premotor areas in all volunteers. Task-related activation of ipsilateral primary motor cortex above a threshold correlation coefficient of 0.5 was seen in two out of five volunteers (at 40°) and one out of five (at 10°) when performing the right-hand task. The present MRI findings readily demonstrate in single subjects that the SMA is involved in self-paced finger tapping. Only sparse activation in the ipsilateral primary motor cortex is consistent with the motor paradigm used.

motor cortex; supplementary motor area; brain mapping; activation, functional

Received April 25, 1994. Revised June 2, 1994. Accepted June 7, 1994.


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