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The Journal of Neurophysiology Vol. 85 No. 6 June 2001, pp. 2613-2623
Copyright ©2001 by the American Physiological Society
1Motor Control Laboratory, Department of Woman and Child Health and 2Division of Human Brain Research, Department of Neuroscience, Karolinska Institutet, 171 77 Stockholm, Sweden
Ehrsson, H. Henrik,
Ers Fagergren, and
Hans Forssberg.
Differential Fronto-Parietal Activation Depending on Force Used
in a Precision Grip Task: An fMRI Study. J. Neurophysiol. 85: 2613-2623, 2001. Recent functional magnetic
resonance imaging (fMRI) studies suggest that the control of fingertip
forces between the index finger and the thumb (precision grips) is
dependent on bilateral frontal and parietal regions in addition to the
primary motor cortex contralateral to the grasping hand. Here we use
fMRI to examine the hypothesis that some of the areas of the brain
associated with precision grips are more strongly engaged when subjects
generate small grip forces than when they employ large grip forces.
Subjects grasped a stationary object using a precision grip and
employed a small force (3.8 N) that was representative of the forces
that are typically used when manipulating small objects with precision grips in everyday situations or a large force (16.6 N) that represents a somewhat excessive force compared with normal everyday usage. Both
force conditions involved the generation of time-variant static and
dynamic grip forces under isometric conditions guided by auditory and
tactile cues. The main finding was that we observed stronger activity
in the bilateral cortex lining the inferior part of the precentral
sulcus (area 44/ventral premotor cortex), the rostral cingulate motor
area, and the right intraparietal cortex when subjects applied a small
force in comparison to when they generated a larger force. This
observation suggests that secondary sensorimotor related areas in the
frontal and parietal lobes play an important role in the control of
fine precision grip forces in the range typically used for the
manipulation of small objects.
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