Alcohol consumption impairs a driver's fine motor control and small muscle coordination before it noticeably affects gross motor skills, resulting in subtle steering instabilities like lane drifting prior to obvious physical drunkenness.
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The statement is true because alcohol impairs fine motor control and precise muscle adjustments at lower blood alcohol concentrations before gross motor skill degradation becomes visible.
The statement is true. Physiological studies confirm that central nervous system depressants like alcohol affect complex neurological pathways responsible for fine motor precision first. Consequently, a driver loses the ability to execute delicate steering micro-adjustments and maintain steady lane positioning at lower blood alcohol levels, well before gross motor impairments (such as stumbling or slurred speech) manifest.
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Hierarchical Motor Function Impairment by Alcohol