The size and shape of sound: The role of articulation and acoustics in iconicity and crossmodal correspondences

Onomatopoeias like hiss and peep are iconic because their forms resemble their meanings. Iconicity can also involve forms and meanings in different modalities, such as when people match the nonce words bouba and kiki to round and angular objects, and mil and mal to small and large ones, also known as "sound symbolism." This paper focuses on what specific analogies motivate such correspondences in spoken language: do people associate shapes and size with how phonemes sound (auditory), or how they are produced (articulatory)? Based on a synthesis of empirical evidence probing the cognitive mechanisms underlying different types of sound symbolism, this paper argues that analogies based on acoustics alone are often sufficient, rendering extant articulatory explanations for many iconic phenomena superfluous. This paper further suggests that different types of crossmodal iconicity in spoken language can fruitfully be understood as an extension of onomatopoeia: when speakers iconically depict such perceptual characteristics as size and shape, they mimic the acoustics that are correlated with these characteristics in the natural world.