Do parakeets exhibit derived stimulus control? Some thoughts on experimental control procedures.

Bromley et al. (1998) wrote a how-to guide for parakeet equivalence studies. They listed new control checks that stop accidental rewards from sneaking into test trials.

The paper is pure method talk. No birds were run; the team simply told future researchers what to watch for.

The authors showed that without extra controls, parakeets can look like they pass equivalence tests when they are really just repeating old response patterns.

They offered step-by-step fixes: add baseline reversals, swap stimulus places, and probe each relation in random order.

Marr (1989) had already warned that early bird equivalence data were probably response-pattern artifacts. The 1998 paper turns that warning into a checklist.

Lattal (1984) asked for tighter tests of associative structure; J et al. answer by spelling out exactly which associative controls to add.

Connell et al. (2004) review talking-parrot studies and claim true verbal functions. J et al. stay quiet on verbal functions but insist you must first rule out simpler stimulus control before claiming anything fancy.

If you run stimulus-equivalence work, even with humans, copy the new controls. Randomize trial order, reverse baselines, and probe each relation alone. These steps stop accidental reinforcement from faking emergent relations. Your data become cleaner and your conclusions safer.