Rapid visuomotor preparation in the human brain: a functional MRI study

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Motor Control

Background:

• Anticipation and preparation are key aspects of human motor behavior.
• Understanding the neural basis of rapid visuomotor preparation is crucial for motor control research.

Purpose of the Study:

• To investigate the brain's neuronal activation patterns during rapid visuomotor preparation of discrete finger responses using functional magnetic resonance imaging (fMRI).
• To explore the neural correlates of the observed "hand-advantage" phenomenon where preparing two fingers on one hand is easier than on two hands.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
• Reaction time measurements were used to assess performance in the visuomotor preparation task.
• Analysis focused on identifying distributed brain networks and specific regional activities.

Main Results:

• A large-scale distributed network, including frontal cortex (middle frontal gyrus, premotor, supplementary motor cortex), parietal cortex (intra-parietal sulcus, inferior and superior parietal lobe), and basal ganglia, was identified in fast visuomotor preparation.
• Reaction time data revealed a "hand-advantage" phenomenon: preparing two fingers on one hand was faster than on two hands.
• This hand-advantage was linked to increased basal ganglia activity and decreased parietal cortex activity.

Conclusions:

• The human brain utilizes a distributed network for rapid visuomotor preparation.
• Differential activity within the basal ganglia and parietal cortex underlies the hand-advantage phenomenon, providing insights into neuro-computational operations in motor preparation.