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Updated: Jul 15, 2026
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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
Published on: April 21, 2023
Central control of grasp: manipulation of objects with complex and simple dynamics
Theodore E Milner1, David W Franklin, Hiroshi Imamizu
1School of Kinesiology, Simon Fraser University, Burnaby, Canada. tmilner@sfu.ca
Neuroimage
|April 25, 2007
Summary
Balancing a flexible ruler, unlike squeezing a foam ball, selectively activates the cerebellum and somatosensory areas. This suggests the cerebellum models complex object dynamics for motor control.
Area of Science:
- Neuroscience
- Motor Control
- Somatosensation
Background:
- Manipulating objects with complex dynamics requires sophisticated neural mechanisms.
- Understanding these mechanisms is crucial for fields ranging from robotics to rehabilitation.
Purpose of the Study:
- To investigate the neural basis of manipulating objects with complex dynamics.
- To contrast brain activity during the manipulation of objects with simple versus complex dynamics.
Main Methods:
- Whole-brain functional magnetic resonance imaging (fMRI) was employed.
- Participants performed two tasks: balancing a weighted flexible ruler (complex dynamics) and squeezing a foam ball (simple dynamics).
- Muscle activation was matched between conditions.
Main Results:
- Primary motor cortex (MI) activity was similar in both tasks, confirming matched muscle activation.
- The ipsilateral cerebellum showed significantly greater activation when balancing the ruler, supporting its role in internal dynamics modeling.
- Areas implicated in tactile object recognition, including secondary somatosensory cortex (SII), Brodmann area 40, and the insula, were selectively activated during ruler manipulation.
Conclusions:
- The cerebellum plays a key role in representing and controlling objects with complex dynamics.
- Somatosensory cortices integrate tactile and proprioceptive information for fine motor adjustments.
- Self-produced sensory feedback may attenuate cortical activity in simpler tasks.
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