Do colourless green voices speak furiously? Linkages between phonetic and visual perception in synaesthesia

Synaesthesia is an unusual phenomenon, in which additional sensory perceptions are triggered by apparently unrelated sensory or conceptual stimuli. The main foci of this presentation lie in vowel sound colour and voice-induced synaesthesia. While grapheme-colour synaesthesia has been intensively researched using various methodologies (neurological studies, extensive interviews, and behavioural experiments), few studies have approached types of synaesthesia based on vocal inducers with detailed acoustic-phonetic and colorimetric analyses. This approach is taken here in order to examine synaesthesiae that have speech sounds and/or the sounds of voices as inducers.