Affective Arousal Links Sound to Meaning

摘要

Prior investigations have demonstrated that people tend to link pseudowords such asboubato rounded shapes andkikito spiky shapes, but the cognitive processes underlying this matching bias have remained controversial. Here, we present three experiments underscoring the fundamental role of emotional mediation in this sound-shape mapping. Using stimuli from key previous studies, we found thatkiki-like pseudowords and spiky shapes, compared withbouba-like pseudowords and rounded shapes, consistently elicit higher levels of affective arousal, which we assessed through both subjective ratings (Experiment 1,N= 52) and acoustic models implemented on the basis of pseudoword material (Experiment 2,N= 70). Crucially, the mediating effect of arousal generalizes to novel pseudowords (Experiment 3,N= 64, which was preregistered). These findings highlight the role that human emotion may play in language development and evolution by grounding associations between abstract concepts (e.g., shapes) and linguistic signs (e.g., words) in the affective system.