Head motion parameters (translation, rotation) during an event-related functional magnetic resonance imaging experiment of overt picture naming were investigated for two fixation conditions. We compared normal fixation with cushions and belts with the additional use of a bite-bar. Neither mean nor maximum values differed between the two conditions for any of the parameters. By applying the head motion parameters to the cytoarchitectonically defined volume of the left Brodmann area 44, we demonstrated volume overlap of 95% (normal fixation) to 100% (bite-bar) that did not differ significantly between fixation conditions. The data encourage further use of overt language production in functional magnetic resonance imaging with careful head fixation but no bite-bar.
aResearch Centre Jülich, Institute of Medicine
bBrain Imaging Center West (BICW), Jülich
cDepartment of Psychiatry and Psychotherapy, RWTH Aachen and
dMax Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany
Correspondence and requests for reprints to Dr Stefan Heim, Research Centre Jülich, Institute of Medicine, AG Brain Mapping, 52425 Jülich, Germany
Tel: +49 2461 61 4208; fax: +49 2461 61 2820; e-mail: firstname.lastname@example.org
Sponsorship: Research was supported by the Max Planck Society (SH) and the Human Brain Project/Neuroinformatics research funded by the National Institute of Biomedical Imaging and Bioengineering, the National Institute of Neurological Disorders and Stroke, and the National Institute of Mental Health (K.A.).
Received 16 January 2006; accepted 8 February 2006