Acoustic context effects, where surrounding changes in pitch, rate or timbre
influence the perception of a sound, are well documented in speech perception,
but how they interact with language background remains unclear. Using a
reverse-correlation approach, we systematically varied the pitch and speech
rate in phrases around different pairs of vowels for second language (L2)
speakers of English (/i/-/I/) and French (/u/-/y/), thus reconstructing, in a
data-driven manner, the prosodic profiles that bias their perception. Testing
English and French speakers (n=25), we showed that vowel perception is in fact
influenced by conflicting effects from the surrounding pitch and speech rate: a
congruent proximal effect 0.2s pre-target and a distal contrastive effect up to
1s before; and found that L1 and L2 speakers exhibited strikingly similar
prosodic profiles in perception. We provide a novel method to investigate
acoustic context effects across stimuli, timescales, and acoustic domain.

用逆相关方法系统地改变英语（/i/-/I/）和法语（/u/-/y/）的第二语言（L2）说话者语速和音高，从而重建偏向他们感知的韵律特征，发现元音感知实际上受到来自周围音高和语速的相冲突效应的影响，且 L1 和 L2 说话者在感知上表现出惊人的相似韵律特征。为研究跨刺激、时间尺度和声学领域的声学背景效应提供了一种新方法。