The role of native language and beat perception ability in the perception of speech rhythm

The perception of rhythm has been studied across a range of auditory signals, with speech presenting one of the particularly challenging cases to capture and explain. Here, we asked if rhythm perception in speech is guided by perceptual biases arising from native language structures, if it is shaped by the cognitive ability to perceive a regular beat, or a combination of both. Listeners of two prosodically distinct languages - English and French - heard sentences (spoken in their native and the foreign language, respectively) and compared the rhythm of each sentence to its drummed version (presented at inter-syllabic, inter-vocalic, or isochronous intervals). While English listeners tended to map sentence rhythm onto inter-vocalic and inter-syllabic intervals in this task, French listeners showed a perceptual preference for inter-vocalic intervals only. The native language tendency was equally apparent in the listeners' foreign language and was enhanced by individual beat perception ability. These findings suggest that rhythm perception in speech is shaped primarily by listeners' native language experience with a lesser influence of innate cognitive traits.