Quantitative analysis of asymmetrical cortical activity based on power spectrum changes

Area of Science:

• Neuroscience
• Functional Magnetic Resonance Imaging (fMRI)

Background:

• Investigating functional asymmetry in motor areas is crucial for understanding brain lateralization.
• Blood oxygenation level-dependent (BOLD) signals are commonly used to measure brain activity.

Purpose of the Study:

• To quantitatively analyze power changes in BOLD signals during sequential finger movements.
• To investigate functional asymmetry of cortical activity in motor areas using a power spectrum method.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used with six right-handed subjects.
• A power spectrum method was employed to analyze BOLD signal power changes.
• Both bi-handed and single-handed sequential finger movements were analyzed.

Main Results:

• Right-handed subjects displayed a larger power difference in BOLD signals between task and rest states in the right motor area compared to the left.
• This indicates greater neural activation in the right motor area for right-handed individuals during these tasks.
• The power spectrum method proved effective for quantitative brain asymmetry analysis.

Conclusions:

• The study confirms functional asymmetry in motor areas for right-handed individuals.
• The power spectrum method is a valid tool for assessing brain asymmetry.
• Findings contribute to understanding hemispheric specialization in motor control.