Room 32, Winner 1st TRU Creative Non-Fiction Competition, 2017

A great-granddaughter reflects on her dying great grandmother as she pays her last visit to her

Investigating the Effects of Speaker Variability on Arabic children’s Acquisition of English Vowels

This study investigated whether speaker variability in phonetic training benefits vowel learnability by Arabic learners of English. Perception training using High-Variability stimuli in laboratory studies has been shown to improve both the perception and production of Second Language sounds in adults and children and has become the dominant methodology for investigating issues in Second Language acquisition. Less consideration is given to production training, in which Second Language learners focus on the role of the articulators in producing second language sounds. This study aimed to assess the role of speaker variability by comparing the effect of using HighVariability and Low-Variability stimuli for production training in a classroom setting. Forty-six Arabic children aged 9-12 years were trained on 18 Standard Southern British English vowels in five training sessions over two weeks and were tested before and after training on their vowel production and category discrimination. The results indicate that Low-Variability stimuli may be more beneficial for children, however, High-Variability stimuli may alter some phonetic cues. Furthermore, the results suggest that production training may be used to improve the perception and production of Second Language sounds, but also to inform the design of Second Language pronunciation learning programmes and theories of Second Language acquisition

Automatic imitation of speech is enhanced for non-native sounds

Simulation accounts of speech perception posit that speech is covertly imitated to support perception in a top-down manner. Behaviourally, covert imitation is measured through the stimulus-response compatibility (SRC) task. In each trial of a speech SRC task, participants produce a target speech sound whilst perceiving a speech distractor that either matches the target (compatible condition) or does not (incompatible condition). The degree to which the distractor is covertly imitated is captured by the automatic imitation effect, computed as the difference in response times (RTs) between compatible and incompatible trials. Simulation accounts disagree on whether covert imitation is enhanced when speech perception is challenging or instead when the speech signal is most familiar to the speaker. To test these accounts, we conducted three experiments in which participants completed SRC tasks with native and non-native sounds. Experiment 1 uncovered larger automatic imitation effects in an SRC task with non-native sounds than with native sounds. Experiment 2 replicated the finding online, demonstrating its robustness and the applicability of speech SRC tasks online. Experiment 3 intermixed native and non-native sounds within a single SRC task to disentangle effects of perceiving non-native sounds from confounding effects of producing non-native speech actions. This last experiment confirmed that automatic imitation is enhanced for non-native speech distractors, supporting a compensatory function of covert imitation in speech perception. The experiment also uncovered a separate effect of producing non-native speech actions on enhancing automatic imitation effects

An emerging role for adenosine and its receptors in bone homeostasis

Bone is continually being remodeled and defects in the processes involved lead to bone diseases. Many regulatory factors are known to influence remodeling but other mechanisms, hitherto unknown, may also be involved. Importantly, our understanding of these currently unknown mechanisms may lead to important new therapies for bone disease. It is accepted that purinergic signaling is involved in bone, and our knowledge of this area has increased significantly over the last 15 years, although most of the published work has studied the role of ATP and other signaling molecules via the P2 family of purinergic receptors. During the last few years, however, there has been increased interest within the bone field in the role of P1 receptors where adenosine is the primary signaling molecule. This review will bring together the current information available in relation to this expanding area of research

Percepción del contraste bilabial-labiodental en las consonantes aproximantes del castellano de Chile

Until recently, the consensus was that labiodental realizations of Spanish /b/ did not exist, and that consequently this variation in place of articulation could be safely disregarded. However, new evidence emerged showing that labiodental variants of /b/ do exist in relatively high numbers, at least in some dialects such as in Chilean Spanish. This study set out to determine whether Chilean Spanish listeners are able to perceive the differences between bilabial and labiodental approximant variants of Spanish /b/ (i.e., [β̞] versus [ʋ]). In order to test this, natural and synthetic stimuli were presented to 31 native listeners in identification and discrimination tasks. Results showed that, while the identification task with natural stimuli provided mixed evidence of sensitivity to the contrast, the identification and discrimination tasks with synthetic stimuli provided no evidence of listeners perceiving the phonetic contrast categorically. In sum, listeners do no seem able to perceive the acoustic differences between the two segments, and thus it is unlikely that this phonetic contrast could be employed to encode sociolinguistic information.Hasta hace poco, el consenso en los precedentes investigativos era que las realizaciones labiodentales de /b/ no existían en el español, y que la variación de su punto de articulación podía ignorarse sin problemas. Sin embargo, evidencia reciente ha demostrado que variantes labiodentales existen y que son frecuentes, al menos en algunas variantes del castellano, como en el caso del castellano chileno. Este estudio se propone determinar si los oyentes del castellano chileno son capaces de percibir las diferencias entre realizaciones aproximantes bilabiales y labiodentales de /b/ (i.e., [β̞] versus [ʋ]). Para evaluar lo anterior, estímulos naturales y sintéticos de [β̞] y [ʋ] fueron preparados y presentados a 31 oyentes nativos en tareas de identificación y discriminación. Los resultados muestran que, mientras en la tarea de identificación con estímulos naturales la evidencia no es concluyente respecto de la existencia de sensibilidad ante el contraste, en las tareas de identificación y discriminación con estímulos sintéticos no existe evidencia que sugiera que los oyentes estén percibiendo el contraste auditivo categóricamente. En suma, los oyentes no parecen ser capaces de percibir las diferencias acústicas entre estos segmentos, y por lo tanto es improbable que el contraste esté siendo utilizado para codificar información sociolingüística

Resilience of English vowel perception across regional accent variation

In two categorization experiments using phonotactically legal nonce words, we tested Australian English listeners’ perception of all vowels in their own accent as well as in four less familiar regional varieties of English which differ in how their vowel realizations diverge from Australian English: London, Yorkshire, Newcastle (UK), and New Zealand. Results of Experiment 1 indicated that amongst the vowel differences described in sociophonetic studies and attested in our stimulus materials, only a small subset caused greater perceptual difficulty for Australian listeners than for the corresponding Australian English vowels. We discuss this perceptual tolerance for vowel variation in terms of how perceptual assimilation of phonetic details into abstract vowel categories may contribute to recognizing words across variable pronunciations. Experiment 2 determined whether short-term multi-talker exposure would facilitate accent adaptation, particularly for those vowels that proved more difficult to categorize in Experiment 1. For each accent separately, participants listened to a pre-test passage in the nonce word accent but told by novel talkers before completing the same task as in Experiment 1. In contrast to previous studies showing rapid adaptation to talker-specific variation, our listeners’ subsequent vowel assimilations were largely unaffected by exposure to other talkers’ accent-specific variation