Neurosurgeon Mike Egnor tells us at Mind Matters that one woman’s left hand seemed to have a mind of its own. Did it?:
This neurological condition occasionally afflicts patients who have had split-brain surgery or other procedures or injuries that disconnect regions of the brain. They experience involuntary movements of limbs. Most commonly it is the left arm, which seems to have a mind of its own. The classic example, which the commenter mentioned, is a patient who intentionally buttons her shirt with her right hand while her left hand follows, unbuttoning her shirt, which she doesn’t intend! More.
Reality check: Dr. Egnor goes on to note that alien hand syndrome doesn’t mean that free will is not real. In fact, it clarifies exactly what free will is and what it isn’t. So it wouldn’t help Biden but he’d probably try to use it anyway.
See also: Science journalist takes an honest look at the “brain sex wars” A safe pre-retirement move, one guesses.