Journal of Phonetics最新文献

This acoustic study explores compensatory influences of foot structure on segmental duration and quantity in the foot nuclei of 22 trisyllabic and four disyllabic structures in vanishing Soikkola Ingrian (Finnic). A robust ternary quantity contrast of consonants is confirmed for both disyllables and trisyllables. While in the shortest disyllables the contrast is “pure” (i.e., not significantly reinforced by the durations of other segments), in all trisyllables it is enhanced through the durationally inverse (compensatory) effects in other segments. In this, the situation in trisyllables is closer to that attested in other languages with ternary consonantal quantity than the situation in disyllables. The phonological quantity contrast has been lost from the second syllable vowel of trisyllables, and its duration is now inversely related to the first syllable complexity. In the segments preceding this vowel, all compensatory effects are purely phonetic. Shorter segmental durations and stronger compensatory effects in trisyllables than in disyllables indicate tendencies for both polysegmental and polysyllabic shortening. We discuss a potential relation of observed compensatory effects of shortening and lengthening (a “half-long” vowel) to foot isochrony and metrical stress.

This paper describes a method for quantifying temporally local variation in the relative rates of speech signals, based on warping curves obtained from dynamic time warping. Although the use of dynamic time warping for signal alignment is well established in speech science, its use to estimate local rate variation is quite rare. Here we introduce an extension of the local relative rate method that supports the quantification of variability in local relative rate, both within and across a set of events. We show how measures of temporal variation derived from this analysis method can be used to characterize the internal temporal structure of events. In order to achieve this, we first provide an overview of the standard dynamic time warping algorithm. We then introduce the local relative rate measure and describe our extensions, applying them to an articulatory and acoustic dataset of consonant-vowel-consonant syllable productions.

The current study investigated second language (L2) vowel learning influence on first language (L1) vowel perception. We examined how late L2-English learners’ perception of L1-Japanese vowels is influenced by learning to perceive a new L2-English vowel. The study compared L1/L2 perception task results from 60 late L1-Japanese learners of L2-English with those of monolingual Japanese (N = 21) and English speakers (N = 16). To further test hypotheses put forward in the revised Speech Learning Model (SLM-r: Flege & Bohn, 2021), that L2 input distribution is associated with L1/L2 phonetic learning, information on L2-learner participants’ L2 dominance was gathered. The results showed clear L1 perceptual drift in a subgroup of L2-learner participants who were NOT nativelike in L2 English /i-ɪ/ categorization but were L2 dominant. The results support the claim that L2 input plays an important role in reorganizing the L1 phonetic system. However, they also highlight the importance of separating L2 dominance related factors (e.g., L2 input/use) and L2 perceptual ability in investigating L1-L2 phonetic interaction.

Sensorimotor synchronization as a means of studying rhythmic perception-action coupling has been extensively researched across a large number of temporally regular structures including music while little is known about synchronization with speech. The present study fills this gap by applying a sensorimotor synchronization paradigm to natural speech and studying acoustic landmarks that may serve as perceptual anchors of rhythmic movement in spoken sentences. Five rhythmically relevant types of acoustic landmarks were identified in twenty sentences of English containing syllables with vocalic and non-vocalic nuclei. The landmarks were either manually defined or algorithm-generated and included nucleus onsets, peaks and onsets of inter-syllabic and inter-stress timescales, moments of the fastest energy change (approximating the P-center location), and timepoints of combined pitch and periodic power. Sensorimotor synchronization data from 32 native English participants were examined with regards to the location of an increased synchronization activity in the proximity of the predefined landmarks. The results demonstrated that participants synchronized with syllable-size units regardless of the type of syllable nucleus (vowel or consonant) and that their taps were consistently timed close to nucleus onsets. Hereby, the manually defined nucleus onsets predicted synchronization peaks as well as the algorithm-generated moments of the fastest energy change around nucleus onsets (i.e., a model of the P-center location) did. In contrast, other landmarks did not constitute a stable acoustic anchor of sensorimotor synchronization with English speech. The synchronization performance was not influenced by either acoustic F0-information or by phonological tune specifications. These findings provide new evidence for the proposals that rhythmic attention in natural speech may be locked on to fast spectral changes within a syllable as the smallest structuring unit of prosodic hierarchy.

Talker variability has been reported to facilitate generalization and retention of speech learning, but is also shown to place demands on cognitive resources. Our recent study provided evidence that phonetically-irrelevant acoustic variability in single-talker (ST) speech is sufficient to induce equivalent amounts of learning to the use of multiple-talker (MT) training. This study is a follow-up contrasting MT versus ST training with varying degrees of temporal exaggeration to examine how cognitive measures of individual learners may influence the role of input variability in immediate learning and long-term retention. Native Chinese-speaking adults were trained on the English /i/-/ɪ/ contrast. We assessed the trainees’ working memory and inhibition control before training. The two trained groups showed comparable long-term retention of training effects in terms of word identification performance and more native-like cue weighting in both perception and production regardless of talker variability condition. The results demonstrate the role of phonetically-irrelevant variability in robust speech learning and modulatory functions of nonlinguistic domain-general inhibitory control and working memory, highlighting the necessity to consider the interaction between input characteristics, task difficulty, and individual differences in cognitive abilities in assessing learning outcomes.