Final answer:
A nurse would expect to see rapid tongue movements in a client with tardive dyskinesia, a condition characterized by involuntary movements due to long-term antipsychotic medication use.
Step-by-step explanation:
The nurse would expect to see rapid tongue movements in a client who is experiencing symptoms of tardive dyskinesia. This condition is associated with long-term use of certain antipsychotic medications and can manifest as repetitive, involuntary movements, which predominantly affect the mouth, lips, and tongue, causing movements such as lip smacking, puckering, and chewing motions. Tardive dyskinesia is a result of alterations in motor control, typically involving regions of the brain like the basal ganglia, which are critical in the regulation of movement.