Cross-modal correspondence is the tendency to systematically map stimulus features across sensory modalities. The current study explored cross-modal correspondence between speech sound and shape (Experiment 1), and whether such association can influence shape representation (Experiment 2). For the purpose of closely examining the role of the two factors- A rticulation and pitch-combined in speech acoustics, we generated two sets of 25 vowel stimuli-pitch-varying and pitch-constant sets. Both sets were generated by manipulating articulation-frontness and height of the tongue body's positions-but differed in terms of whether pitch varied among the sounds within the same set. In Experiment 1, participants made a forced choice between a round and a spiky shape to indicate the shape better associated with each sound. Results showed that shape choice was modulated according to both articulation and pitch, and we therefore concluded that both factors play significant roles in sound-shape correspondence. In Experiment 2, participants reported their subjective experience of shape accompanied by vowel sounds by adjusting an ambiguous shape in the response display. We found that sound-shape correspondence exerts an effect on shape representation by modulating audiovisual interaction, but only in the case of pitch-varying sounds. Therefore, pitch information within vowel acoustics plays the leading role in sound-shape correspondence influencing shape representation. Taken together, our results suggest the importance of teasing apart the roles of articulation and pitch for understanding sound-shape correspondence.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korean government (No. NRF-2016R1A2B4011267 and No. NRF-2017M3C7A1029659) awarded to C-YK and by National Institutes of Health-National Institute on Deafness and Other Communication Disorders (No. DC-002717) to Haskins Laboratories. We also thank Christian Wallraven for helpful comments on the research and on the manuscript.
© 2020 Copyright 2020 by Koninklijke Brill NV, Leiden, The Netherlands.
- Cross-modal correspondence
- audiovisual interaction
- bouba-kiki effect
- speech sound
- visual shape
- vowel sound
ASJC Scopus subject areas
- Experimental and Cognitive Psychology
- Sensory Systems
- Computer Vision and Pattern Recognition
- Cognitive Neuroscience