Neural Adaptation to a Working Memory Task: A Concurrent EEG-fNIRS Study
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.
KeywordsMultimodality EEG fNIRS Working memory Mental workload Practice time Adaptation
This study is made possible in part by a research award from the National Science Foundation (NSF) IIS: 1065471 (Shewokis, PI). The content of the information herein does not necessarily reflect the position or the policy of the sponsors and no official endorsement should be inferred.
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