In a split-brain patient, a brain hemisphere relies on outside events to know what is happening in the opposite hemisphere. For example, the left hemisphere, non-dominant for emotions, can pick up signals from facial expressions. This is referred to as:

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Cross-cueing is a phenomenon where one hemisphere of the brain communicates with the other through external cues, such as facial expressions, in split-brain patients.

In a Split-Brain Patient, a Brain Hemisphere Relies on Outside