Variable-interval schedule performance in open and closed economies.

Researchers tested how rats respond on variable-interval (VI) food schedules.

They compared two setups: closed economy where food only comes from the session, and open economy where rats can eat outside the session.

Each rat worked under both conditions to see how the economy type changed their response patterns.

In closed economies, rats worked harder when food became scarce - their response rates went up as reinforcement rates dropped.

In open economies, the same rats showed mixed results - some slowed down, others stayed the same, but none showed the clear increase seen in closed economies.

This means the same VI schedule produces different behavior depending on whether the animal has other food sources available.

LeBlanc et al. (2003) extended these findings by showing that higher reinforcement rates don't just increase responses - they also make behavior more resistant to disruption.

This connects to Iwata et al. (1990) because both studies reveal how reinforcement context shapes VI performance, just through different lenses (economy type vs resistance to change).

WEINELong (1962) used similar VI schedules but added response cost instead of changing economies - both manipulations altered response patterns, suggesting multiple variables can shift VI baseline performance.

The 1990 study's economy manipulation and the 2003 resistance findings together suggest that what happens outside the session (food access) and what happens within it (reinforcement density) both critically determine how organisms respond to VI schedules.

When you set up reinforcement programs, consider whether clients can access reinforcers outside therapy. A child who gets candy at home may respond differently to your token system than one who only earns tokens with you. Test both open and closed arrangements to find what works best for each learner.