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Foundations of Augmented Cognition

Volume 9183 of the series Lecture Notes in Computer Science pp 268-280

Date:

Neural Adaptation to a Working Memory Task: A Concurrent EEG-fNIRS Study

  • Yichuan LiuAffiliated withSchool of Biomedical Engineering, Science and Health Systems, Drexel UniversityCognitive Neuroengineering and Quantitative Experimental Research (CONQUER) Collaborative, Drexel University Email author 
  • , Hasan AyazAffiliated withSchool of Biomedical Engineering, Science and Health Systems, Drexel UniversityCognitive Neuroengineering and Quantitative Experimental Research (CONQUER) Collaborative, Drexel University
  • , Banu OnaralAffiliated withSchool of Biomedical Engineering, Science and Health Systems, Drexel UniversityCognitive Neuroengineering and Quantitative Experimental Research (CONQUER) Collaborative, Drexel University
  • , Patricia A. ShewokisAffiliated withSchool of Biomedical Engineering, Science and Health Systems, Drexel UniversityCognitive Neuroengineering and Quantitative Experimental Research (CONQUER) Collaborative, Drexel UniversityNutrition Sciences Department, College of Nursing and Health Professions, Drexel UniversityDepartment of Surgery, College of Medicine, Drexel University

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Abstract

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.

Keywords

Multimodality EEG fNIRS Working memory Mental workload Practice time Adaptation