An operant approach to rehabilitation medicine: overcoming learned nonuse by shaping.

The team worked with adults who had chronic stroke. Each still had one weak arm they had stopped using.

Therapists put the good arm in a sling for hours. Then they shaped tiny wrist or finger moves with praise.

Every patient gained large, useful motor skills. They also became more independent in daily tasks.

Horner (1971) first used shaping to teach a preschooler with spina bifida to walk with crutches. Taub et al. (1994) now shows the same idea works for adults with stroke.

Cavézian et al. (2010) later added bimanual play to limb restraint for kids with cerebral palsy. Their gains match the adult stroke results, so the trick spans ages and diagnoses.

Ghaemmaghami et al. (2018) proved shaping can build complex communication without bringing back problem behavior. Together these papers say shaping is safe and powerful across skills.

If a client avoids using a limb, try briefly blocking the strong side and reinforce any small attempt with the weak one. Start with tiny movements and raise the bar each time. This cheap, low-risk tactic can unlock big functional gains even years after the original injury.