Right-hemisphere activity enables a split-brain patient's left hand to carry out instructions the patient cannot verbalize. This best illustrates the importance of

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The split-brain patient is unable to verbally communicate instructions to their left hemisphere (which is typically responsible for language processing), but their left hand (which is controlled by the right hemisphere) can still carry out those instructions. This suggests that unconscious thought processes in the right hemisphere are important for certain types of motor behavior.

Right-Hemisphere Activity Enables a Split-Brain Patient's Left Hand to Carry