When Words Sound Big or Small: Investigation of Sound Symbolism in Korean

This study investigates vowel-based sound symbolism in Korean ideophones, focusing on how contrasts between yang and yin vowels—associated with perceived size, valence, and intensity—influence lexical processing. Experiment 1, a questionnaire study, confirmed that ideophones containing yin vowels were interpreted as conveying greater negativity, intensity, and size than those with yang vowels. Experiment 2 employed a lexical decision task to examine whether such sound-symbolic associations influence real-time language processing. The results were mixed: accuracy data indicated a mismatch effect, with lower accuracy for yang-vowel ideophones following large-object primes, but no clear facilitation under congruent conditions. Additionally, reaction times for yang-vowel ideophones were slower overall, regardless of prime type. These findings suggest that while explicit sound-symbolic associations are robust, their effects on online lexical processing are context-dependent. Notably, faster responses to yin-vowel ideophones align with prior evidence that conceptually larger objects are processed more efficiently, highlighting the interaction between phonological iconicity and semantic salience in language comprehension.