Table 1

Individual modes of synesthetic colour experience
Spatial locations Interferences
External Internal Gaze centred Posture Sound source Unaffected
S1 x x
S2 x x
S3 x x
S4 x
S5 x x
S6 x x
S7 x x x
S8 x x
S9 x x x
S10 x x x
S11 x x

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

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