Synaesthetic perception of colour and visual space in a blind subject: An fMRI case study

► Coloured synaesthesia engages the colour area hOC4v in a late-blind synaesthete. ► Spatial sequence synaesthesia activates occipito-parietal brain areas. ► Audiovisual integration related to the processing of inducers and concurrents in synaesthesia engages the insular cortex.