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Brain Connectivity Analysis Under Semantic Vigilance and Enhanced Mental States
Fares Al-Shargie1, Usman Tariq1, Omnia Hassanin1
1Biosciences and Bioengineering Research Institute, Department of Electrical Engineering, American University of Sharjah, P.O. Box 26666, Sharjah, UAE.
Audio stimulation enhances brain connectivity and cognitive function during vigilance tasks. This method quantifies brain coupling, showing improved network connectivity and mood with auditory input.
Area of Science:
- Neuroscience
- Cognitive Science
- Signal Processing
Background:
- Vigilance and mental states significantly impact cognitive performance and brain activity.
- Quantifying brain region coupling is crucial for understanding cognitive processes.
- Existing methods may not fully capture dynamic changes in brain networks during cognitive tasks.
Purpose of the Study:
- To develop and validate a method for quantifying brain region coupling during vigilance and enhanced mental states.
- To investigate the effects of audio stimulation on brain connectivity and cognitive performance.
- To assess the influence of audio stimulation on emotional states.
Main Methods:
- Utilized partial directed coherence (PDC) and graph theory analysis (GTA) to quantify brain region coupling.
- Induced vigilance using a modified Stroop Color-Word Task (SCWT).
- Applied simultaneous bilateral audio stimulation (250 Hz pure tone) during SCWT to induce an enhanced mental state.
Main Results:
- Partial directed coherence (PDC) effectively detected vigilance decrement, showing reduced brain connectivity with increased time-on-task (TOT).
- Audio stimulation maintained high brain connectivity during the enhanced state, outperforming the vigilance state.
- Enhanced connectivity was observed in frontal, parietal regions, and the right hemisphere, correlating with improved response times.
Conclusions:
- Audio stimulation enhances cognitive processing efficiency and brain connectivity.
- The developed method using PDC and GTA is sensitive to changes in vigilance and mental states.
- Audio stimulation positively impacts emotional states, reducing fatigue and anger while increasing happiness and calmness.
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