Controlling instabilities in manipulation requires specific cortical-striatal-cerebellar networks

Area of Science:

• Neuroscience
• Motor Control
• Cognitive Neuroscience

Background:

• Dexterous manipulation involves both force production (strength) and dynamic regulation (dexterity).
• Cortical control of stable grips is understood, but regulation of unstable objects remains unclear.
• Understanding neural mechanisms is crucial for rehabilitation after neurological injury.

Purpose of the Study:

• To investigate the cortical networks involved in the dexterous control of objects with varying instabilities.
• To identify how the brain adapts motor control strategies for unstable object manipulation.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to observe brain activity.
• Participants performed manipulation tasks with objects of increasing instability.
• Computational regression models analyzed functional connectivity between brain regions.

Main Results:

• Increased object instability linearly correlated with heightened basal ganglia activity.
• Specific cortical networks showed mutable connection strengths associated with instability.
• Fronto-parietal networks showed expected activity for grip control.

Conclusions:

• The basal ganglia may play a key role in modulating premotor areas for controlling unstable objects.
• This study reveals novel insights into the brain's adaptable control of dynamic multifinger manipulation.
• Findings support a selectable cortical representation for grasp stability during complex tasks.