Reinforcement, stereotypy, and rule discovery.

College students played a computer task. Some earned points for correct early responses. Others got points no matter what. A third group skipped pretraining.

Next everyone tried to discover the hidden rule that won the game. The team counted how many repetitive, stereotypy-like clicks each group made.

Extra reinforcement during pretraining gave zero edge in rule discovery. It also did not make students click more repetitively.

Stereotypy rose only when the task was repeated many times, not because of how the points were delivered.

Steinhauser et al. (2021) and Boyle et al. (2018) look like they clash. They show that contingent DRA or FCT quickly cuts stereotypy in autistic children. The 1990 lab says contingency makes no difference in college students. The gap disappears when you see the later work targets automatic reinforcement in clinical kids, while the 1990 study looks at task-bound repetition in neurotypical adults.

Cerutti et al. (2004) and Slaton et al. (2025) extend the idea. They move contingency control from the lab to real kids. They pair response blocking or communication training with matched sensory reinforcement and get strong stereotypy reduction.

Shearn et al. (1997) add another twist. Non-contingent sensory reinforcement alone lowered stereotypy in people with developmental delay. Again, matched sensory input, not arbitrary points, made the difference.

For your clients, do not assume that any contingent reward will create or worsen stereotypy. If the behavior is automatically reinforced, deliver matched sensory substitutes non-contingently or teach a communication response that produces the same sensation. Save contingency-based DRA for behaviors clearly maintained by social payoff.