“…So far, evidence from androgen treatment of individuals lacking the masculinisation of the larynx (e.g. female-to-male transsexuals and adult males with hypogonadism) has shown that vocal folds are still sensitive to testosterone in adulthood, with testosterone injections permanently thickening the folds and thus lowering voice F0 (Akcam et al, 2004;Baker, 1999;Talaat et al, 1987;Van Borsel et al, 2000). However, the potential effects of testosterone exposure in adult males without androgen deficiencies on the physiology (vocal fold mass and length, vocal tract length and extensibility) and on the behavioural control of the vocal apparatus (Pisanski et al, 2012) remain largely unknown.…”