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Illustrations of SSDs. (A) Tongue Display Unit (TDU); (B) vOICe; (C) Prosthesis for Substitution of Vision with Audition (PSVA) [from Collignon et al. (2007); with the permission of O. Collignon]; (D) Eyecane; (E) Sound of Vision (SoV) [adapted from Hoffmann et al. (2018)]; and (F) Guidance Sensory Substitution Device (GSSD).
