Key result
The phasic component of electrodermal activity exhibited high correlation to the power of alpha waves (maximum r = 0.91) and high inverse correlation to delta waves, unlike the tonic component.
Why the study?
Information on the brain mechanisms driving the generation of electrodermal activity components in humans is scarce.
Does the phasic component of electrodermal activity correlate more strongly with brain activity than the tonic component in subjects performing a cognitive task?
Observational (n=10)
Does the phasic component of electrodermal activity correlate more strongly with brain activity than the tonic component in subjects performing a cognitive task?
The phasic component of electrodermal activity is a better peripheral indicator of brain activity (specifically alpha and delta waves) than the tonic component during cognitive tasks.
Answers are grounded in this paper and cite their sources.
Phasic EDA may index cortical activity during cognition; leaves open any clinical or research applications pending larger validation.
Electrodermal activity (EDA) represents the changes in electrical conductance of the skin, including phasic and tonic changes thought to be the result of sympathetic neuronal activity. EDA is a sensitive physiological index of autonomic sympathetic activity and can be easily incorporated to wearable devices to assess emotional and cognitive stress. Information of the brain mechanisms driving the generation of the components of EDA in humans is scarce. We collected EEG and EDA data from ten subjects performing a cognitive task for 24 hours to gain insight of the brain activity linked to the changes on peripheral EDA. We didn't find any significance correlation between the tonic component of EDA and the brain activity, whereas phasic components of EDA exhibited high correlation to power of alpha waves in all the channels collected in this study (maximum r = 0.91 in the occipital point), and high inverse correlation to delta waves mainly in the occipital and parietal channels.
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Posada–Quintero et al. (2019) reported an observational. Cognitive task was evaluated on Correlation between EDA components and brain activity (r = 0.91). The phasic component of electrodermal activity exhibited high correlation to the power of alpha waves (maximum r = 0.91) and high inverse correlation to delta waves, unlike the tonic component.
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