RESISTANCE TO EXTINCTION IN THE GOLDFISH FOLLOWING SCHEDULES OF CONTINUOUS AND VARIABLE INTERVAL REINFORCEMENT.

Scientists put goldfish in tanks with a tiny lever.

If the fish bumped the lever, they got a food pellet.

Some fish got food every time they pressed.

Other fish got food only now and then on a variable schedule.

After many presses, the food stopped.

The team watched how long each fish kept pressing.

Fish used to getting food every time pressed fast at first.

Their pressing then dropped off quickly.

Fish used to getting food only sometimes kept pressing longer.

The pattern matched earlier work with pigeons and rats.

It shows the partial-reinforcement extinction effect works in fish too.

Schwartz (1975) found that uncertainty can make conditioned reinforcers stronger.

Both studies show that not knowing when reward comes changes behavior.

Bickel et al. (1991) used a similar single-case lab style with adult humans.

They looked at mutual reinforcement instead of extinction, but the tight design is the same.

Perone (2019) reminds us to welcome exact replications like this fish study.

Repeating basic effects across species keeps our science solid.

If you fade reinforcement too fast after continuous reward, the child may quit quickly.

If you thin the schedule first, the skill may last longer during extinction.

Try mixing easy and hard trials to mimic variable payoff.

Watch if the learner keeps going when tokens stop—this predicts real-world persistence.