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Diurnal variations of tonic electrodermal activity
1Département de Psychologie, Laboratoire Temps et Cognition, Université de Lille III, Villeneuve d'Ascq, France.
Summary
Skin conductance level (SCL) increases throughout the day, regardless of laboratory conditions. This diurnal electrodermal variation is important for electrodermal activity (EDA) research.
Area of Science:
- Psychophysiology
- Human Physiology
- Behavioral Science
Background:
- Electrodermal activity (EDA) research often overlooks diurnal variations.
- Skin conductance level (SCL) is a key psychophysiological measure.
Purpose of the Study:
- To investigate the diurnal variability of skin conductance level (SCL).
- To examine SCL in relation to skin temperature (ST) and reaction time (RT).
Main Methods:
- Two experiments were conducted to assess SCL, ST, and RT.
- Experiment I involved controlled laboratory conditions with multiple daily sessions.
- Experiment II assessed SCL under more heterogeneous, real-world conditions.
Main Results:
- Skin conductance level (SCL) showed a linear increase throughout the day in controlled conditions.
- SCL was consistently higher in the evening compared to the morning in both experiments.
- SCL patterns were asynchronous with skin temperature (ST) and reaction time (RT) variations.
Conclusions:
- These findings provide evidence for significant diurnal electrodermal variation.
- Temporal variations in SCL should be considered in future electrodermal activity (EDA) research.