Long-term potential for imprinting in ducks and chickens.
Ducks can imprint even as adults, while chickens lose the skill after infancy.
01Research in Context
What this study did
Researchers tested whether adult ducks and chickens could still imprint. They showed each bird a moving panel of colored lights.
The birds had lived alone since hatching. No earlier imprinting chance had been given.
What they found
Adult ducks formed a filial bond to the lights. They followed the panel like baby ducks follow mom.
Adult chickens ignored the lights. They showed no new attachment.
How this fits with other research
Hoffman et al. (1966), Pliskoff et al. (1967), and Hoffman et al. (1969) proved that ducklings imprint in the first two days. Their imprinted stimulus then works as a strong reinforcer for key pecking or feeding.
The 1980 study extends that work. It asks, "Can imprinting still happen later?" The answer is yes for ducks, no for chickens.
The older papers and the new one do not clash. They map different points on the same timeline: early plasticity in chicks versus lifelong plasticity in ducks.
Why it matters
Critical periods are not fixed across species. When you design early interventions, remember that some learners may stay open to new social cues far longer than others. Test, do not assume, the window has closed.
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02At a glance
03Original abstract
In the first of five experiments, three of four adult ducks who had been reared in visual isolation gradually developed strong approach responses towards a moving panel of colored lights. Experiment 2 provided evidence that the ducks' approach response reflected the same sort of social attachment that is typically formed to moving objects by newly hatched ducklings. Experiment 3 revealed that the fourth duck would not approach the moving stimulus even after additional exposure to it, but would approach a conspecific after group housing had been enforced for seven days. In Experiment 4, none of five adult chickens who had been reared in visual isolation developed approach responses towards the moving stimulus, even though in Experiment 5, newly hatched chicks approached the stimulus quite readily. Taken together, these findings (a) indicate that ducks retain the ability to form filial-type attachments to novel objects throughout their lives, and (b) offer preliminary evidence that chickens do not retain this ability into adulthood.
Journal of the experimental analysis of behavior, 1980 · doi:10.1901/jeab.1980.33-383