This study investigated the interaction between tone and corrective focus in Taiwan Mandarin using phone number strings formatted as (NNN)-(NNN)-(NNNN). Both production and perception experiments were conducted to examine the contrastive focus prosody of each lexical tone using number words. The study hypothesized that contrastive focus prosody in Taiwan Mandarin would be weaker and less distinct than in Beijing Mandarin. Results from the production experiment revealed unique patterns in the realization of contrastive focus across different tones. Random forest analysis showed that each focused tone exhibited distinct acoustic characteristics when marking contrastive focus. These findings suggest that the prosodic marking of contrastive focus is tone-dependent. However, regardless of tone type, Taiwan Mandarin speakers consistently prioritized duration cues in producing contrastive focus, indicating that duration played a primary role among other acoustic parameters. Despite these tone-specific distinctions, the overall magnitude of contrastive focus prosody in Taiwan Mandarin was notably weak and less distinct. This weakness made it challenging for listeners to identify the positions of contrastive focus, resulting in low identification rates in the perception experiment. The results of this study suggest that the prosodic realization of contrastive focus is shaped by language-specific phonetic and phonological implementation, and that focus effects can vary even between different varieties of the same language.
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