Influence of ambient temperature on tonic and phasic electrodermal activity components

Area of Science:

• Physiology
• Biomedical Engineering
• Environmental Science

Background:

• Electrodermal activity (EDA) reflects sympathetic nervous system function.
• EDA recordings are susceptible to environmental factors like ambient temperature.
• Understanding temperature's influence is crucial for accurate EDA interpretation, especially in wearable devices.

Purpose of the Study:

• To investigate the precise influence of ambient temperature on tonic and phasic electrodermal activity (EDA) components.
• To evaluate a novel EDA measurement technique for simultaneously recording multiple EDA parameters.
• To determine the significance of temperature control for different EDA components.

Main Methods:

• Recorded tonic and phasic EDA components (skin conductance, susceptance, potential) at three different ambient temperatures.
• Utilized a new EDA measurement technique for simultaneous parameter recording.
• Applied cognitive, visual, and breathing stimuli to evoke electrodermal responses in 36 healthy participants.

Main Results:

• Significant temperature effects were observed on tonic electrodermal activity (EDA) parameters: skin conductance (SC), skin susceptance (SS), and skin potential (SP).
• Tonic EDA parameters demonstrated a clear increase with rising ambient temperature.
• No significant temperature-induced effects were found on phasic SC, SS, and SP, indicating their robustness.

Conclusions:

• Maintaining normal room temperature is critical for reliable recording and analysis of tonic EDA components.
• Phasic EDA components are less sensitive to ambient temperature fluctuations, making them more robust for applications where temperature control is challenging.
• These findings are particularly relevant for the application of EDA instruments, especially in wearable technology.