Growing evidence suggests that, along with arbitrariness, non-arbitrariness exists in language. An example of this is iconicity, in which a word’s form resembles its meaning. We investigated whether phonological processing plays a key role in the facilitated processing of iconic language (i.e., in some studies the meanings of iconic words are retrieved more quickly and more accurately). First, we reanalyzed the phonological lexical decision task (PLDT) data from Experiment 2 in Sidhu, Vigliocco, and Pexman (2020), and used accuracy on pseudohomophone trials to gauge extent of phonological processing. Participants with greater pseudohomophone accuracy were found to show larger iconic facilitation. We further tested this relationship with a new PLDT experiment, and collected imitativeness ratings for 522 words in order to manipulate the imitativeness of the iconic stimuli used. We found again that individual differences in phonological processing interacted with iconic facilitation. Further, these effects were found only for imitative iconic words (i.e., onomatopoeia and ideophones), suggesting that direct imitativeness is important to iconic facilitation. These findings suggest phonology plays a key role in iconic facilitation, and that the extent to which an individual engages in phonological processing may affect the strength of observed iconicity effects.
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