|Individual modes of synesthetic colour experience|
|External||Internal||Gaze centred||Posture||Sound source||Unaffected|
Most subjects described the tone-induced synesthetic colours occurring internally, while a few experienced them externally. Apart from this polarity, one subject described the synesthetic colours occurring in a gaze-centred manner. Furthermore, for many subjects, the spatial locations varied depending on their posture and/or the sound source. Many subjects also reported their synesthetic colours being unaffected by interfering aspects.
Jäncke et al.
Jäncke et al. BMC Neuroscience 2012 13:151 doi:10.1186/1471-2202-13-151