Matching sounds to shapes: Evidence of the bouba-kiki effect in naĆÆve baby chicks Maria Loconsole1*, Silvia Benavides-Varela2,3, Lucia Regolin1 Humans across multiple languages spontaneously associate the nonwords ākikiā and āboubaā with spiky and round shapes, respectively, a phenomenon named the bouba-kiki effect. To explore the origin of this association, and whether it is unique to humans, we tested the bouba-kiki effect in baby domestic chickens (Gallus gallus). as a precocial species, chicks can be tested shortly after hatching, allowing us to control their pretest experiences. Similar to humans, both 3-day-old [experiment 1 (exp. 1)] and 1-day-old (exp. 2) chicks spontaneously choose a spiky shape when hearing the ākikiā sound and a round shape when hearing the āboubaā sound. results from naĆÆve young animals suggest a predisposed mechanism for matching the dimensions of shape and sound, which may be widespread across species.
main fig from the paper showing the association between bouba/round and kiki/spiky in newborn chicks
the new paper on bouba/kiki in chicks is utterly compelling
canonical, elegant method from comparative cogsci & its partner in developmental science, ultra-simple design, ultra-clear effects, no need for fancy analyses, machine learning, or AI
it appeared in an appropriately badass venue (Science)