講演抄録/キーワード |
講演名 |
2012-07-22 13:15
[招待講演]Amplitude drops facilitate categorization and discrimination of length contrasts ○Shigeto Kawahara(Rutgers Univ.) TL2012-22 |
抄録 |
(和) |
(事前公開アブストラクト) This study begins with two phonological observations: (i) sonorant geminates are disfavored in many phonological systems and (ii) the more sonorous the geminate, the more it is disfavored. Podesva (2000) hypothesizes that the preference against sonorant geminates exists because these geminates are easily confused with corresponding singletons. This confusability problem arises because sonorants have blurry transitions into and out of flanking vowels, and consequently their constriction durations are difficult to perceive. This problem is worse for more sonorous segments. This talk reports perception experiments that test these hypotheses. The stimuli were non-speech sounds that mimicked the spectral properties of geminate contrasts in obstruents and sonorants. The results of the first two experiments show that spectral continuity in sonorants makes the singleton-geminate distinction less distinct. Two follow-up experiments show that length contrasts in sonorants with smaller amplitude drops from the surrounding vowels are harder to perceive. I conclude that the phonological preference against sonorant geminates has its root in the perceptual imperative to avoid segments that are confusable with other segments. |
(英) |
Kato et al. showed that given streams of sounds, listeners use amplitude changes to demarcate segmental boundaries. This study builds on this result and argues that amplitude changes facilitate categorization and discrimination of consonantal short/long contrasts in intervocalic position. Given non-speech stimuli mimicking VCV-sequences, larger amplitude changes in VC- and CV-transitions improved the perceptibility of the length of C. The result implies that in real speech, short/long contrasts are harder to perceive for more sonorous consonants. This conclusion in turn accords well with the phonological, cross-linguistic observation that geminates of more sonorous consonants are disprefered more strongly in natural languages, instantiating a case of contrast dispersion. |
キーワード |
(和) |
/ / / / / / / |
(英) |
perception of duration / geminates / short/long contrasts / contrast dispersion / amplitude changes / / / |
文献情報 |
信学技報, vol. 112, no. 145, TL2012-22, pp. 67-72, 2012年7月. |
資料番号 |
TL2012-22 |
発行日 |
2012-07-14 (TL) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
TL2012-22 |