Neural Adaptation to a Working Memory Task: A Concurrent EEG-fNIRS Study
- Cite this paper as:
- Liu Y., Ayaz H., Onaral B., Shewokis P.A. (2015) Neural Adaptation to a Working Memory Task: A Concurrent EEG-fNIRS Study. In: Schmorrow D., Fidopiastis C. (eds) Foundations of Augmented Cognition. AC 2015. Lecture Notes in Computer Science, vol 9183. Springer, Cham
Simultaneously recorded electroencephalography (EEG) and functional near infrared spectroscopy (fNIRS) measures from sixteen subjects were used to assess neural correlates of a letter based n-back working memory task. We found that EEG alpha power increased and prefrontal cortical oxygenation decreased with increased practice time for the high memory load condition (2-back), suggesting lower brain activation and a tendency toward the ‘idle’ state. The cortical oxygenation changes for the low memory load conditions (0-back and 1-back) changed very little throughout the training session which the behavioral scores showed high accuracy and a ceiling effect. No significant effect of practice time were found for theta power or the behavioral performance measures.