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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Bouba/kiki effect | 2/2 | https://en.wikipedia.org/wiki/Bouba/kiki_effect | reference | science, encyclopedia | 2026-05-05T15:12:58.334859+00:00 | kb-cron |
=== Contexts where the effect is smaller or absent === Other research suggests that this effect does not occur in all communities, and it appears that the effect breaks if the sounds do not make licit words in the language. The bouba–kiki effect seems to be dependent on a long sensitive period, with high visual capacities in childhood being necessary for its typical development. Although the congenitally blind have been reported to show a bouba–kiki effect, they show a much smaller one for touched shapes than sighted individuals do for visual shapes.
=== Languages with little observed effect === A major 2021 study showed that certain languages, namely Mandarin Chinese, Turkish, Romanian, and Albanian, on average showed lower-than-50% matches for both associating bouba with roundedness and kiki with jaggedness. However, the authors consider their analysis conservative and not clear enough to confirm if these four definitively lacked the bouba–kiki phenomenon. For example, the phonetic structures of these languages or their participants' cultural associations with sound and shape could have led to the weaker correlations observed. Further research is being conducted to further verify the correlation between low-effect languages and the bouba-kiki phenomenon.
=== Neuroscience === In 2019, Nathan Peiffer-Smadja and Laurent Cohen published the first study using fMRI to explore the bouba–kiki effect. They found that prefrontal activation is stronger to mismatching (bouba with spiky shape) than to matching (bouba with round shape) stimuli. A subsequent study by Kelly McCormick and colleagues reported a similar pattern of greater activation for mismatched word-shape stimuli, but with most activity in parietal regions including the intraparietal sulcus and supramarginal gyrus, regions known to play a role in sensory association and perceptual-motor processing. Peiffer-Smadja and Cohen also found that sound-shape matching also influences activations in the auditory and visual cortices, suggesting an effect of matching at an early stage in sensory processing.
=== Implications for understanding language === Ramachandran and Hubbard suggest that the kiki/bouba effect has implications for the evolution of language, because it suggests that the naming of objects is not completely arbitrary. The rounded shape may most commonly be named "bouba" because the mouth makes a more rounded shape to produce that sound while a more taut, angular mouth shape is needed to make the sounds in "kiki". Alternatively, the distinction may be between coronal or dorsal consonants like /k/ and labial consonants like /b/, or, as Fort and Schwartz suggest, the difference may be attributed to the noise a "bouba" shape makes when bounced (lower frequency and more continuous) in comparison to a spiked object. Additionally, it was shown that it is not only different consonants (e.g., voiceless versus voiced) and different vowel qualities (e.g., /a/ versus /i/) that play a role in the effect, but also vowel quantity (long versus short vowels). In one study, participants rated words containing long vowels to refer to longer objects and short vowels to short objects, at least for languages that make a vowel length distinction. The presence of these "synesthesia-like mappings" suggest that this effect may be the neurological basis for sound symbolism, in which sounds are non-arbitrarily mapped to objects and events in the world. Research has also indicated that the effect may be a case of ideasthesia, a phenomenon in which activations of concepts (inducers) evoke perception-like experiences (concurrents). The name comes from the Greek idea and aisthesis, meaning "sensing concepts" or "sensing ideas", and was introduced by Danko Nikolić. However, it has been reported that the bouba-kiki effect is also exhibited by newly hatched chickens. Therefore, such sound-shape correspondences may belong to a set of innate cross-modal associations that are shared across species, rather than being a speech-related phenomenon that is distinctive to humans.
== See also == Color symbolism Japanese sound symbolism Origin of language Semiotics Synesthesia Universal language
== References ==
== Further reading == Margiotoudi, Konstantina; Bohn, Manuel; Schwob, Natalie; Taglialatela, Jared; Pulvermüller, Friedemann; Epping, Amanda; Schweller, Ken; Allritz, Matthias (2022). "Bo-NO-bouba-kiki: Picture-word mapping but no spontaneous sound symbolic speech-shape mapping in a language trained bonobo". Proceedings of the Royal Society B: Biological Sciences. 289 (1968) 20211717. doi:10.1098/rspb.2021.1717. PMC 8808101. PMID 35105236. This study tested the bouba/kiki effect in Kanzi, a language-competent bonobo, finding that non-human primates did not demonstrate the same shape-sound association as humans, hinting at a possible human-specific ability tied to language exposure. Chen, S., & Maurer, D. (2022). The Bouba/Kiki Effect in Early Childhood: Evidence from Preschoolers. Developmental Science, 25(5), e13277. This developmental study provides insights into how young children perceive sound-symbolic shapes, indicating that the bouba/kiki effect may emerge in early childhood, potentially pointing to innate sound-shape associations that become refined with language exposure. Allison Parshall, "Pain Language: The sound of 'ow' transcends borders", Scientific American, vol. 332, no. 2 (February 2025), pp. 16–18. "Many languages have an interjection word for expressing pain. [Katarzyna Pisanski et al., writing in the Journal of the Acoustical Society of America, have] found that pain interjections tend to contain the vowel sound 'ah' (written as [a] in the International Phonetic Alphabet) and letter combinations that incorporate it, such as 'ow' and 'ai.' These patterns may point back to the origins of human language itself." (p. 16.) "Researchers are continually discovering cases of symbolism, or sound iconicity, in which a word's intrinsic nature has some connection to its meaning. These cases run counter to decades of linguistic theory, which had regarded language as fundamentally arbitrary... [Many words onomatopoeically imitate a sound. Also] there's the 'bouba-kiki' effect, whereby people from varying cultures are more likely to associate the nonsense word 'bouba' with a rounded shape and 'kiki' with a spiked one.... [S]omehow we all have a feeling about this,' says Aleksandra Ćwiek... [She and her colleagues have] show[n] that people associate the trilled 'R' sound with roughness and the 'L' sound with smoothness. Mark Dingemanse... in 2013 found [that] the conversational 'Huh?' and similar words in other languages may be universal." (p. 18.)