Are words easier to learn from infant- than adult-directed speech? A quantitative corpus-based investigation

We investigate whether infant-directed speech (IDS) could facilitate word form learning when compared to adult-directed speech (ADS). To study this, we examine the distribution of word forms at two levels, acoustic and phonological, using a large database of spontaneous speech in Japanese. At the acoustic level we show that, as has been documented before for phonemes, the realizations of words are more variable and less discriminable in IDS than in ADS. At the phonological level, we find an effect in the opposite direction: the IDS lexicon contains more distinctive words (such as onomatopoeias) than the ADS counterpart. Combining the acoustic and phonological metrics together in a global discriminability score reveals that the bigger separation of lexical categories in the phonological space does not compensate for the opposite effect observed at the acoustic level. As a result, IDS word forms are still globally less discriminable than ADS word forms, even though the effect is numerically small. We discuss the implication of these findings for the view that the functional role of IDS is to improve language learnability.Comment: Draf

An exploration of the rhythm of Malay

In recent years there has been a surge of interest in speech rhythm. However we still lack a clear understanding of the nature of rhythm and rhythmic differences across languages. Various metrics have been proposed as means for measuring rhythm on the phonetic level and making typological comparisons between languages (Ramus et al, 1999; Grabe & Low, 2002; Dellwo, 2006) but the debate is ongoing on the extent to which these metrics capture the rhythmic basis of speech (Arvaniti, 2009; Fletcher, in press). Furthermore, cross linguistic studies of rhythm have covered a relatively small number of languages and research on previously unclassified languages is necessary to fully develop the typology of rhythm. This study examines the rhythmic features of Malay, for which, to date, relatively little work has been carried out on aspects rhythm and timing. The material for the analysis comprised 10 sentences produced by 20 speakers of standard Malay (10 males and 10 females). The recordings were first analysed using rhythm metrics proposed by Ramus et. al (1999) and Grabe & Low (2002). These metrics (∆C, %V, rPVI, nPVI) are based on durational measurements of vocalic and consonantal intervals. The results indicated that Malay clustered with other so-called syllable-timed languages like French and Spanish on the basis of all metrics. However, underlying the overall findings for these metrics there was a large degree of variability in values across speakers and sentences, with some speakers having values in the range typical of stressed-timed languages like English. Further analysis has been carried out in light of Fletcher’s (in press) argument that measurements based on duration do not wholly reflect speech rhythm as there are many other factors that can influence values of consonantal and vocalic intervals, and Arvaniti’s (2009) suggestion that other features of speech should also be considered in description of rhythm to discover what contributes to listeners’ perception of regularity. Spectrographic analysis of the Malay recordings brought to light two parameters that displayed consistency and regularity for all speakers and sentences: the duration of individual vowels and the duration of intervals between intensity minima. This poster presents the results of these investigations and points to connections between the features which seem to be consistently regulated in the timing of Malay connected speech and aspects of Malay phonology. The results are discussed in light of current debate on the descriptions of rhythm

Production of Estonian quantity contrasts by Japanese speakers

Estonian and Japanese are quantity languages both exploiting the duration cue to implement phonological contrasts. However, the quantity systems of the two languages are different – Estonian features a three-way quantity contrast while Japanese has a binary contrast. This paper studies how L2 subjects with Japanese-language background (L2-JP) produce the Estonian quantity contrasts. For the acoustic analysis the speech recordings by six L2-JP subjects and 12 native Estonian (L1-EE) subjects were used. The material analyzed consists of read sentences comprising triplets of segmentally identical disyllabic target words in the quantities Q1 (short), Q2 (long) and Q3 (overlong). In their production, the L2-JP subjects successfully produced the Q1/Q2 contrast but failed in contrasting vocalic Q2 and Q3 (CVVCV vs. CVVːCV) oppositions; however, the subjects managed to produce the Q2/Q3 consonantal quantity contrasts (CVCCV vs. CVCːCV). The L2-JP subjects’ segment durations differing from those of the L1-EE subjects, reveal the role of native durational patterns on the acquisition of Estonian quantity oppositions.Kokkuvõte. Einar Meister, Rena Nemoto, Lya Meister: Eesti välted jaapani emakeelega keelejuhtide häälduses. Eesti ja jaapani keel on kvantiteedikeeled, st mõlemad keeled kasutavad kestust fonoloogiliste vastanduste väljendamiseks. Kvantiteedisüsteemid kahes keeles on siiski erinevad – eesti keelt iseloomustab kolmene vältevastandus, jaapani keeles on kestusvastandus binaarne. Artiklis uuriti eesti väldete hääldust jaapani emakeelega keelejuhtide kõnes ja võrreldi seda eesti emakeelega keelejuhtide hääldusega. Akustiliseks analüüsiks kasutati kuue eesti keelt võõrkeelena kõneleva jaapanlase ja 12 eesti emakeelega keelejuhi etteloetud lausete salvestusi, milles esinesid vältevastandusi kandvad kahesilbilised sõnad. Tulemused näitasid, et jaapani keelejuhid hääldasid kontrastiivselt esma- ja teisevältelisi sõnu, kuid ei eristanud teise- ja kolmandavältelisi vokaalikeskse vastandusega (CVVCV vs CVVːCV) sõnu. Samas hääldasid nad erinevalt teise- ja kolmandavältelisi konsonandikeskse vastandusega (CVCCV vs CVCːCV) sõnu. Leitud segmendikestuste erinevused jaapanlaste ja eestlaste kõnes peegeldavad emakeelsete kestusmustrite erinevusi kahes keeles.Märksõnad: eesti keel, jaapani keel, aktsendiga kõne, fonoloogiline kestus, välte

The analysis of breathing and rhythm in speech

Speech rhythm can be described as the temporal patterning by which speech events, such as vocalic onsets, occur. Despite efforts to quantify and model speech rhythm across languages, it remains a scientifically enigmatic aspect of prosody. For instance, one challenge lies in determining how to best quantify and analyse speech rhythm. Techniques range from manual phonetic annotation to the automatic extraction of acoustic features. It is currently unclear how closely these differing approaches correspond to one another. Moreover, the primary means of speech rhythm research has been the analysis of the acoustic signal only. Investigations of speech rhythm may instead benefit from a range of complementary measures, including physiological recordings, such as of respiratory effort. This thesis therefore combines acoustic recording with inductive plethysmography (breath belts) to capture temporal characteristics of speech and speech breathing rhythms. The first part examines the performance of existing phonetic and algorithmic techniques for acoustic prosodic analysis in a new corpus of rhythmically diverse English and Mandarin speech. The second part addresses the need for an automatic speech breathing annotation technique by developing a novel function that is robust to the noisy plethysmography typical of spontaneous, naturalistic speech production. These methods are then applied in the following section to the analysis of English speech and speech breathing in a second, larger corpus. Finally, behavioural experiments were conducted to investigate listeners' perception of speech breathing using a novel gap detection task. The thesis establishes the feasibility, as well as limits, of automatic methods in comparison to manual annotation. In the speech breathing corpus analysis, they help show that speakers maintain a normative, yet contextually adaptive breathing style during speech. The perception experiments in turn demonstrate that listeners are sensitive to the violation of these speech breathing norms, even if unconsciously so. The thesis concludes by underscoring breathing as a necessary, yet often overlooked, component in speech rhythm planning and production

Sounds Serbian? Acoustic properties of Serbian EFL students' speech

This paper presents the findings of a study of the acoustic properties of Serbian EFL students' vowels. The participants were 12 junior-year students of the English Department. Their vowel production was recorded in three different contexts, i.e. speaking tasks: reading words in citation form, reading a text aloud, and speaking. The acoustic measurements included vowel duration and F1 and F2 formant frequency values. The results showed that neither the production of vowel qualities nor the duration differences used by the students were without problem

Speech characteristics of monozygotic twins and a same-sex sibling: an acoustic case study of coarticulation patterns in read speech

This case study reports on an acoustic investigation of the motor speech characteristics of a set of young adult male monozygotic (MZ) twins and compares them to those of an age- and sex-matched sibling who participated in the study 2 years later to match for demographic factors. Coarticulation patterns were investigated from read samples of consonant-vowel sequences in monosyllabic words containing a variety of consonants and vowels. This was done by examining F2 vowel onsets and F2 vowel targets, plotted as F2 locus equations. Data were processed for between-sibling differences using a number of statistical tests. Results indicated that the MZ twins displayed F2 parameters and coarticulation patterns which were more similar than those of their age- and sex-matched sibling. The results of this case study therefore suggest that acoustic phonetic parameters used to index coarticulation patterns have the potential to profile some of the similarities and differences in the speech characteristics of genetically related individuals

Spontaneous Voice Gender Imitation Abilities in Adult Speakers

Background The frequency components of the human voice play a major role in signalling the gender of the speaker. A voice imitation study was conducted to investigate individuals' ability to make behavioural adjustments to fundamental frequency (F0), and formants (Fi) in order to manipulate their expression of voice gender. Methodology/Principal Findings Thirty-two native British-English adult speakers were asked to read out loud different types of text (words, sentence, passage) using their normal voice and then while sounding as ‘masculine’ and ‘feminine’ as possible. Overall, the results show that both men and women raised their F0 and Fi when feminising their voice, and lowered their F0 and Fi when masculinising their voice. Conclusions/Significance These observations suggest that adult speakers are capable of spontaneous glottal and vocal tract length adjustments to express masculinity and femininity in their voice. These results point to a “gender code”, where speakers make a conventionalized use of the existing sex dimorphism to vary the expression of their gender and gender-related attributes

Acoustic-phonetic characteristics of speech produced with communicative intent to counter adverse listening conditions

This study investigated whether speech produced in spontaneous interactions when addressing a talker experiencing actual challenging conditions differs in acoustic-phonetic characteristics from speech produced: (a) with communicative intent under more ideal conditions, and (b) without communicative intent under imaginary challenging conditions (read, clear speech). It also investigated whether acoustic-phonetic modifications made to counteract the effects of a challenging listening condition are tailored to the condition under which communication occurs. 40 talkers were recorded in pairs while engaged in ‘spot the difference’ picture tasks in good and challenging conditions. In the challenging conditions, one talker heard the other: (1) via a three-channel noise vocoder (VOC); (2) with simultaneous babble noise (BABBLE). Read, clear speech showed more extreme changes in median F0, F0 range and speaking rate than speech produced to counter the effects of a challenging listening condition. In the VOC condition, where F0 and intensity enhancements are unlikely to aid intelligibility, talkers did not change their F0 median and range; mean energy and vowel F1 increased less than in the BABBLE condition. This suggests that speech production is listener-focused, and that talkers modulate their speech according to their interlocutors’ needs, even when not directly experiencing the challenging listening condition

Simultaneous bilingualism and speech style as predictors of variation in allophone production:Evidence from Finland-Swedish

This study investigates cross-linguistic transfer in the production of long mid front vowels [øː] and [œː] by simultaneous bilingual Finnish and Finland-Swedish speakers in Finland. In Swedish, the phoneme /ø/ can be realised as the allophones [ø] and [œ], while in Finnish, only [ø] is used. Combining approaches from sociophonetic and bilingual transfer research, the study used acoustic analysis to compare the height and fronting of [øː] and [œː] produced by bilingual and monolingual Finland-Swedish speakers in three different speech styles on a continuum of formality. The data from 115 participants are stratified according to language background, speech style, region, and age. The statistical analysis indicates increased overlap of [øː] and [œː] in the vowel spaces of bilingual speakers, particularly in informal speech. The results suggest a potential effect of Finnish transfer on the distinction of the phonetic variants in simultaneous Finland-Swedish bilinguals, as well as demonstrate the importance of considering speech style in bilingual transfer research