Operant conditioning in the guinea pig.

Jones et al. (1977) wrote a short note about guinea pigs in operant chambers.

They did not run new trials. They warned that guinea pigs may need different reinforcers or schedules than rats or pigeons.

The paper gives no data. It only says "procedures may need tweaking."

In plain words: we are not sure what works yet for guinea pigs.

Azrin et al. (1967) and Wright (1972) showed pigeons learn fine under fixed-interval and probability schedules. Their clear positive results clash with the guess-work tone of Jones et al. (1977). The clash is only apparent: the pigeon papers had grain reinforcers and long training histories, while R et al. never tested any setup.

Duker et al. (1996) found visual cues give rats stronger "behavioral momentum" than auditory cues. This extends the warning from R et al. — even within a species, stimulus type matters. If you switch to guinea pigs, you may need to test both light and sound again.

Lewon et al. (2019) showed food and water deprivation interact in mice. Their data support the idea that motivating operations can act differently across species, backing the cautious stance of R et al.

If you run animal labs or teach undergrads, remember that guinea pigs are not rats. Start with short sessions, test edible versus water reinforcers, and watch for within-session drift. The note reminds us to validate procedures whenever we leave the usual species.