Hans Rutger Bosker


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  • Bosker, H. R. (2021). The contribution of amplitude modulations in speech to perceived charisma. In B. Weiss, J. Trouvain, M. Barkat-Defradas, & J. J. Ohala (Eds.), Voice attractiveness: Prosody, phonology and phonetics (pp. 165-181). Singapore: Springer. doi:10.1007/978-981-15-6627-1_10.


    Speech contains pronounced amplitude modulations in the 1–9 Hz range, correlating with the syllabic rate of speech. Recent models of speech perception propose that this rhythmic nature of speech is central to speech recognition and has beneficial effects on language processing. Here, we investigated the contribution of amplitude modulations to the subjective impression listeners have of public speakers. The speech from US presidential candidates Hillary Clinton and Donald Trump in the three TV debates of 2016 was acoustically analyzed by means of modulation spectra. These indicated that Clinton’s speech had more pronounced amplitude modulations than Trump’s speech, particularly in the 1–9 Hz range. A subsequent perception experiment, with listeners rating the perceived charisma of (low-pass filtered versions of) Clinton’s and Trump’s speech, showed that more pronounced amplitude modulations (i.e., more ‘rhythmic’ speech) increased perceived charisma ratings. These outcomes highlight the important contribution of speech rhythm to charisma perception.
  • Bosker, H. R., & Peeters, D. (2021). Beat gestures influence which speech sounds you hear. Proceedings of the Royal Society B: Biological Sciences, 288: 20202419. doi:10.1098/rspb.2020.2419.


    Beat gestures—spontaneously produced biphasic movements of the hand— are among the most frequently encountered co-speech gestures in human communication. They are closely temporally aligned to the prosodic charac- teristics of the speech signal, typically occurring on lexically stressed syllables. Despite their prevalence across speakers of the world’s languages, how beat gestures impact spoken word recognition is unclear. Can these simple ‘flicks of the hand’ influence speech perception? Across a range of experiments, we demonstrate that beat gestures influence the explicit and implicit perception of lexical stress (e.g. distinguishing OBject from obJECT), and in turn can influence what vowels listeners hear. Thus, we pro- vide converging evidence for a manual McGurk effect: relatively simple and widely occurring hand movements influence which speech sounds we hear

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