The part of the brain that controls those functions (the medulla) isn’t the same part that controls balance (the cerebellum) or movement (the frontal lobe). Alcohol affects all areas of the brain, however the severity of those effects on your different brain lobes are brought on at different blood alcohol levels. So, even when the part of your brain that controls your motion, speech, etc., is thoroughly sauced the other parts of your brain continue to function although not at 100% performance. Speaking of sauce, [here](https://www.pugetsound.edu/student-life/counseling-health-and-wellness/training-prevention/substance-abuse-prevention/alcohol-you/alcohols-effect-on-your-brain/) is where I got that answer from.
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