Key result
Integrating pharmacokinetic caffeine models with ACT-R fatigue modules explains performance metrics during sleep deprivation.
Why the study?
Most computational theories of cognition lack integration of physiological representations to explain cognitive effects of environmental compounds like caffeine.
Does caffeine improve performance metrics in sleep-deprived participants performing the psychomotor vigilance test?
Does caffeine improve performance metrics in sleep-deprived participants performing the psychomotor vigilance test?
Integrating physiologically based pharmacokinetic models with cognitive architectures can explain the effects of caffeine on fatigue and performance.
May inform caffeine dosing for performance in sleep deprivation; extends PBPK-ACT-R modeling but leaves open clinical validation.
Most computational theories of cognition lack a representation of physiology. Understanding the cognitive effects of compounds present in the environment is important for explaining and predicting changes in cognition and behavior given exposure to toxins, pharmaceuticals, or the deprivation of critical compounds like oxygen. This research integrates physiologically based pharmacokinetic (PBPK) model predictions of caffeine concentrations in blood and tissues with ACT-R's fatigue module to predict the effects of caffeine on fatigue. Mapping between the PBPK model parameters and ACT-R model parameters is informed by the neurophysiological literature and established associations between ACT-R modules and brain regions. The results from three such parameter mappings are explored to explain observed data from sleep-deprived participants performing the psychomotor vigilance test with and without caffeine. Predicted caffeine concentrations in the brain are used to modulate procedural parameters in the fatigue module to explain caffeine's effects on multiple performance metrics.
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Halverson et al. (2022) studied Sleep deprivation and fatigue. Caffeine vs. Without caffeine was evaluated on Performance metrics on the psychomotor vigilance test. Integrating physiologically based pharmacokinetic model predictions of caffeine concentrations with ACT-R's fatigue module explained caffeine's effects on performance metrics in sleep-deprived participants.
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