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Table 1 Individual modes of synesthetic colour experience

From: Pre-attentive modulation of brain responses to tones in coloured-hearing synesthetes

  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
  1. 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.