The Sleepiness-Induced Lapsing and Cognitive Slowing (SILCS) model is designed to improve the credibility and accuracy of synthetic warfighters used in high fidelity simulation systems. The empirically derived SILCS model describes sleep deprivation and time-of-day effects on performance in terms of the intluence of two phenomena-general response slowing and lapsing. The former produces small increases in response time while the latter causes significant increases and errors.

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