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Assessment of working memory abilities using an event-related brain potential (ERP)-compatible digit span backward
Celeste D Lefebvre1, Yannick Marchand, Gail A Eskes
1Department of Psychology, Dalhousie University, Life Sciences Centre, Halifax NS, Canada B3H 4J1. clefebvr@dal.ca
Summary
This study shows that the ERP-Digit Span Backward task can identify working memory capacity using brainwave patterns. This neurophysiological marker may aid in assessing cognitive function, especially in individuals with communication challenges.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
Background:
- Working memory is crucial for cognitive function.
- Assessing working memory capacity is important for clinical and research purposes.
Purpose of the Study:
- To evaluate an ERP-compatible Digit Span Backward (ERP-DB) task for measuring working memory abilities.
- To identify neurophysiological markers associated with working memory capacity.
Main Methods:
- Participants completed standard and ERP-DB tasks.
- The ERP-DB task involved auditory digit sequences presented in correct or incorrect reverse order.
- Different set sizes were used across two participant groups.
Main Results:
- Distinct brainwave components (P200/P300 and Positive Slow Wave/PSW) differentiated correct and incorrect conditions.
- PSW and dPSW (difference in PSW amplitude) decreased with increased working memory load.
- PSW and dPSW correlated with individual working memory capacity.
Conclusions:
- The PSW, dPSW, and P200/P300 components show potential as neurophysiological markers for working memory capacity.
- The ERP-DB task is a viable tool for assessing working memory, with implications for individuals with communication impairments.