Contextual control of delay discounting by pathological gamblers.

Twenty adults with diagnosed pathological gambling visited a lab twice. One session took place inside their favorite casino or betting shop. The other happened in a quiet university room miles away.

Each time they completed a 27-item delay-discounting task. They chose between a smaller amount of money right now or a larger amount after a delay. The team compared how steeply each person discounted future rewards across the two settings.

Sixteen out of twenty gamblers showed a clear shift. In the gambling venue they acted as if future money was worth even less. Outside the venue they were more willing to wait.

The remaining four people looked the same in both places. Context did not change their discounting curve.

van Schrojenstein Lantman-de Valk et al. (2006) used the same brief single-case method to test reading fluency packages. Both studies show you can spot individual differences fast, but Giallo et al. (2006) warns that the room itself is part of the test.

Negus (2024) reframes addiction as a two-person economy. Giallo et al. (2006) gives a concrete example: the physical economy of slot machines and betting counters can instantly steepen discounting, supporting Negus’s call to study real-life reinforcers.

Wulfert et al. (2006) kept every gambler in CBT by adding a short motivational interview. Their high retention fits here: if context changes how gamblers value money, assessing them only in a clinic may miss the behavior you want to treat.

If you assess delay discounting to plan treatment, run the task where the client actually gambles. A clinic score may underestimate impulsivity that shows up on the casino floor. Try a brief second probe on site before you write the behavior plan.