Localisation of cerebral function using topographical mapping of EEG: a preliminary validation study

Area of Science:

• Neuroscience
• Cognitive Science
• Biomedical Engineering

Background:

• Electroencephalography (EEG) is a non-invasive method for measuring brain activity.
• Topographical mapping of EEG provides spatial information about brain function.
• Localizing cerebral function is crucial for understanding cognitive processes.

Purpose of the Study:

• To validate topographical mapping of EEG as a method for localizing cerebral function.
• To investigate EEG activity during a simple motor task in healthy subjects.

Main Methods:

• Recorded electroencephalography (EEG) from 24 healthy, right-handed subjects under four conditions: eyes open (1 and 2) and a randomized motor task (left/right).
• Analyzed a minimum of 20 seconds of artifact-free EEG data.
• Computed EEG amplitude maps across delta, theta, alpha, and beta (1 and 2) frequency bands.

Main Results:

• Significant differences in EEG amplitude were observed between eyes-open and motor task conditions.
• These differences were primarily localized to the motor and supplementary motor areas.
• Specific alterations were noted in alpha, beta 1, and beta 2 frequency bands during the motor task.

Conclusions:

• Topographical mapping of EEG is a valid and effective method for localizing cognitive function.
• The study successfully demonstrated the technique's ability to pinpoint functional areas in the brain during motor tasks.
• Findings support the use of EEG topographical mapping for cognitive function assessment in healthy individuals.