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Does Cognitive Load Affect Measures of Consciousness?
André Sevenius Nilsen1, Johan Frederik Storm1, Bjørn Erik Juel2
1Brain Signaling Group, Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, 0372 Oslo, Norway.
Brain Sciences
|September 28, 2024
Summary
Objective measures of consciousness using electroencephalography (EEG) signal diversity are not affected by cognitive load. These EEG measures may be useful in clinical settings for assessing consciousness when attention or processing is impaired.
Area of Science:
- Neuroscience
- Cognitive Science
Background:
- Reliable measurement of consciousness is crucial for research and clinical applications.
- Several theoretical measures of consciousness exist, but their sensitivity to non-consciousness-related brain activity is untested.
- This study investigates if cognitive load affects proposed measures of consciousness.
Purpose of the Study:
- To determine if cognitive resource loading modulates objective electroencephalography (EEG)-based measures of consciousness.
- To assess the specificity of EEG measures for consciousness versus general cognitive demands.
Main Methods:
- Recorded EEG from 12 participants under passive attention and high cognitive load (working memory task).
- Compared several proposed EEG-based measures of consciousness between the two conditions.
- Analyzed the P300b event-related potential and EEG signal diversity measures.
Main Results:
- The P300b potential, linked to conscious awareness, was significantly affected by the working memory task.
- EEG signal diversity measures, applied to spontaneous and perturbed EEG, showed no significant difference between conditions.
- This indicates signal diversity measures are not sensitive to cognitive load.
Conclusions:
- EEG signal diversity measures are robust to changes in cognitive load.
- These measures hold promise for clinical use in assessing consciousness, even with impaired attention or processing.
- They offer a potential tool for evaluating states of consciousness independent of task demands.
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