Australian English yeh, hm, mhm, oh, ah, right [9]
British English yes, m, no, yeah, really [8]
Dutch: uh-huh, okay, ja, hela, jawel, nee, nou, zo [10, 1]
Egyptian Arabic: ah, mmm, laughter, tayeb, aiwa [5]
Finnish: joo, nii [11]
Italian: ah, mhm, mm, oh, si, uhuh [1]
Korean: mhm, n, ney, yeh, a, ah [6]
Mandarin Chinese: ao, ai, dui [4]
Swedish: ja, m, nä, va, nej, jo, jaha, aha, okej, just [2]
Vietnamese o', u', vang [7]
[1] Feedback in Second Language Acquisition, Jens Allwood. in Adult Language Acquisition: Cross Linguistic Perspectives, II: The Results, Clive Perdue, editor. pp 196-235. Cambridge University Press, 1993.
[2] Investigating Communicative Feedback Phenomena across Languages and Modalities, Loredana Cerrato. KTH Ph.D. Thesis, 2007.
[3] Non-and Quasi-lexical Realizations of "Positive Response" in Korean, Polish, and Thai. Maciej Karpinski, Janusz Klesta, and Emilias Szalkowsa. in Speech Prosody 2006.
[4] English Backchannels in Mandarin Conversations: A case study of superstraum pragmatic `interference'. Hongyin Tao and Sandra A. Thompson. Journal of Pragmatics 16, pp 209-223. 1991.
[5] A Prosodic Feature that Invites Back-Channels in Egyptian Arabic. Nigel Ward and Yaffa Al Bayyari. Perspectives on Arabic Linguistics, Volume XX, pp 187-206, Mustafa Mughazy (ed.), John Benjamins, 2007.
[6] Identifying Units in Interaction: Reactive Tokens in Korean and English Conversations. Richard F. Young and Jina Lee. Journal of Sociolinguistics, 8, 2004, pp 380-407.
[7] Prosody of Vietnamese from an Interactional Perspective: o', u', and vang in Backchannels and Requests for Information. Kieu Phuong Ha, Journal of the Southeast Asian Linguistics Society, 3, 2010, pp 56-76.
[8] Conversational Style in British and American English: The case of backchannels. Gunnel Tottie, in English Corpus Linguistics, Karin Aijmer and Bengt Altenberg (eds.), Longman, 1991, pp 254-271.
[9] Xudong Deng, personal communication,
[10] The MultiLis Corpus - Dealing with Individual Differences in Nonverbal Listening Behavior. Iwan de Kok and Dirk Heylen. COST 2102 Training School 2010, pp 362-375.
[11] Responding in Conversation: A study of response particles in Finnish. Marja-Leena Sorjonen. Benjamin Cummings, 2001.
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