The disruption of autoshaped key pecking in the pigeon by food-tray illumination.

Researchers worked with pigeons in a small lab chamber. A key lit up for a few seconds before grain arrived.

On some trials the food tray also lit up when the key did. The team counted key pecks to see if the extra light changed behavior.

Birds pecked the key far less when the feeder glowed at the same time. The added light pulled their attention away from the key.

The simple lesson: extra reinforcement cues can back-fire and weaken the response you want.

Zentall et al. (1975) ran a near-copy study the next year. They also saw brighter cues cut key pecks, matching the 1974 result.

Christophersen et al. (1972) showed the same problem two years earlier. A lit key slowed learning about airflow cues, proving extra visual stimuli can overshadow the target signal.

Redd (1969) had good news: autoshaping works with shock reduction. The 1974 paper shows the flip side—once the response is running, added feeder light can still knock it down.

Keep your reinforcement signals clean. If you pair a tablet app with music, or give extra visual flashes when tokens drop, you may accidentally lower the response you just shaped. Run a quick A-B-A check: present the reinforcer with and without the extra cue, and watch the data. If responding dips, drop the add-on and stay with one clear stimulus.