Short-term memory in the pigeon: delayed-pair-comparison procedures and some results.

The team worked with pigeons in a lab.

Birds saw two colors, one after the other.

After a short wait they had to peck the key that matched the first color.

The wait time and how long each color stayed on were changed to see how memory held up.

Longer looks at the first color helped the birds pick correctly.

When the wait grew, accuracy dropped.

If the task asked the birds to remember extra colors, scores fell to near-chance.

The birds could learn a simple peck-turn-peck move that acted like a note to self and lifted recall.

Shimp et al. (1974) showed pigeons can keep a single stimulus-response link for a few seconds. The 1977 study adds that birds can also recall the first of two colors after a gap, and even use their own behavior as a memory aid.

Bacon-Prue et al. (1980) later asked pigeons to remember two colors in order. They saw the same drop in accuracy when the gap grew, confirming the time-loss pattern.

Grant (1989) went further and taught birds a line cue that meant “forget the last sample.” This shows pigeons can both boost and shut down memory, extending the mnemonic idea first seen in Griffin et al. (1977).

The birds’ little trick—doing a quick move to remind themselves—proves an operant memory aid can work. With kids or adults who struggle to hold items in mind, try adding a brief self-action right after the cue. A hand clap, a tap, or a whispered word may act like the pigeons’ peck-turn-peck and keep the target item alive until the response is due.