Functional analysis of tardive dyskinesia: implications for assessment and treatment.

Two adults with developmental delay and tardive dyskinesia (TD) took part. The team ran a classic analogue functional analysis. They tested if the jerky, involuntary movements got worse when staff gave attention, toys, or escape from tasks.

Sessions rotated every five minutes. One condition let the client rest alone. Another gave toys for free. A third gave praise each time TD showed. A fourth let the client leave work when TD appeared. The team also tried brief motor warm-ups before some sessions.

Social rewards did not drive the movements. Attention, toys, or escape did not make TD stronger or faster. The movements looked the same across all social conditions.

When the clients squeezed a ball or lifted their arms for one minute before the session, the TD dropped right away. The change was clear for both people.

Dicesare et al. (2005) saw the opposite pattern. For one child, methylphenidate flipped the function of disruptive behavior. Off the drug, the behavior was attention-driven; on the drug, it was not. DeLeon et al. (2005) show that TD never had a social function, drug or no drug. The gap is about topography: true TD is motor-based, not operant.

Spriggs et al. (2016) reviewed 37 cases where meds changed behavior. Most reductions were simple dose effects, but four cases showed a real shift in function. G et al. add a new row to that table: some movement side effects need motor activation, not behavioral treatment.

Hilton et al. (2010) used the MEDS scale to flag TD risk in adults on long-term antipsychotics. Their survey work pairs well with G et al.’s lab work: screen with MEDS, then test function if movements appear.

If your client on antipsychotics starts odd facial or finger movements, run a quick FA before you write a behavior plan. When social tests show no effect, try a simple motor warm-up instead of tokens or breaks. You might cut the movements in minutes without extra meds or restraint.