A physiological and dynamical systems model of stress

Area of Science:

• Physiology
• Complexity Science
• Psychology

Background:

• Stress responses exhibit significant variability across individuals and time.
• Existing research has not fully characterized the underlying causes of this stress response variance.

Purpose of the Study:

• To develop and analyze a dynamical systems model of stress.
• To explore how system parameters contribute to the variability in stress responses.

Main Methods:

• Coupled a closed-loop physiological control system with a dynamic oscillator.
• Characterized the model's evolution within a physiological phase space and attractor landscape.
• Analyzed the sensitivity of the model to its controlling parameters.

Main Results:

• The dynamical system model demonstrated high sensitivity to parameter variations.
• The model successfully replicated several observed features of stress responses.
• Parameter sensitivity suggests a potential source for empirical stress variability.

Conclusions:

• Viewing stress as a dynamical system provides a framework for understanding response variability.
• Specific model parameters are likely key contributors to individual differences in stress responses.
• This approach offers new insights into the complex, nonlinear nature of stress physiology.