“…Mandarin does not have segmental length contrasts (Lin, 2001), although Mandarin tones vary in length, and some listeners have been reported to use length to distinguish between tones when the main cue – the F0 pattern – has been artificially manipulated to be ambiguous (Tseng, Massaro, & Cohen, 1986; Blicher, Diehl, & Cohen, 1990; Jongman, Wang, Moore, & Sereno, 2006). As for sibilants, Mandarin has voiceless alveolo-palatals ([ɕ], [tɕ]) and retroflexes ([ʂ], [tʂ]) as allophones of the same phoneme: alveolo-palatals occur before high front vowels and the palatal glide, and retroflexes occur elsewhere (Lin, 2001).…”