When alcohol impairs a driver's total reaction time, the primary cause of the delay is slowed central nervous system processing in the brain during hazard perception and decision-making, rather than a significant reduction in the physical speed of muscle contraction.
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The statement is correct because alcohol is a central nervous system depressant. Its primary physiological impact on driver reaction time is slowing down brain processing speed, hazard evaluation, and decision formulation. The physical execution phase of muscle movement accounts for a negligible portion of the overall impairment delay.
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Central Nervous System Processing Latency under Alcohol Impairment