Interactions between brain structure and behavior: the corpus callosum and bimanual coordination

Area of Science:

• Neuroscience
• Human anatomy
• Motor control

Background:

• Bimanual coordination is vital for daily activities.
• The corpus callosum (CC) facilitates interhemispheric communication for coordinated movements.
• Early studies on callosotomy patients highlighted the CC's role in bimanual interaction.

Purpose of the Study:

• To review the relationship between microstructural properties of the CC and bimanual performance.
• To investigate if distinct bimanual tasks map to specific CC subregions.
• To discuss factors like age, pathology, and training that mediate this brain-behavior link.

Main Methods:

• Review of existing literature on corpus callosum structure and function.
• Analysis of noninvasive in vivo imaging techniques (e.g., diffusion tensor imaging).
• Examination of studies involving callosotomy patients and healthy volunteers.

Main Results:

• Evidence links CC microstructural properties to bimanual performance.
• Specific bimanual functions may correlate with distinct anatomical CC subdivisions.
• Factors such as age, pathology, and training influence the CC-bimanual performance relationship.

Conclusions:

• The CC plays a crucial role in integrating information for bimanual coordination.
• Mapping bimanual tasks to CC subregions is an ongoing research area.
• Future research should further explore the structure-function relationship within the CC for bimanual control.