Speech Rhythm Research Articles

Ten-month-old infants’ neural tracking of naturalistic speech is not facilitated by the speaker’s eye gaze

Eye gaze is a powerful ostensive cue in infant-caregiver interactions, with demonstrable effects on language acquisition. While the link between gaze following and later vocabulary is well-established, the effects of eye gaze on other aspects of language, such as speech processing, are less clear. In this EEG study, we examined the effects of the speaker’s eye gaze on ten-month-old infants’ neural tracking of naturalistic audiovisual speech, a marker for successful speech processing. Infants watched videos of a speaker telling stories, addressing the infant with direct or averted eye gaze. We assessed infants’ speech-brain coherence at stress (1–1.75 Hz) and syllable (2.5–3.5 Hz) rates, tested for differences in attention by comparing looking times and EEG theta power in the two conditions, and investigated whether neural tracking predicts later vocabulary. Our results showed that infants’ brains tracked the speech rhythm both at the stress and syllable rates, and that infants’ neural tracking at the syllable rate predicted later vocabulary. However, speech-brain coherence did not significantly differ between direct and averted gaze conditions and infants did not show greater attention to direct gaze. Overall, our results suggest significant neural tracking at ten months, related to vocabulary development, but not modulated by speaker’s gaze.

Non-autistic persons modulate their speech rhythm while talking to autistic individuals.

How non-autistic persons modulate their speech rhythm while talking to autistic (AUT) individuals remains unclear. We investigated two types of phonological characteristics: (1) the frequency power of each prosodic, syllabic, and phonetic rhythm and (2) the dynamic interaction among these rhythms using speech between AUT and neurotypical (NT) individuals. Eight adults diagnosed with AUT (all men; age range, 24-44 years) and eight age-matched non-autistic NT adults (three women, five men; age range, 23-45 years) participated in this study. Six NT and eight AUT respondents were asked by one of the two NT questioners (both men) to share their recent experiences on 12 topics. We included 87 samples of AUT-directed speech (from an NT questioner to an AUT respondent), 72 of NT-directed speech (from an NT questioner to an NT respondent), 74 of AUT speech (from an AUT respondent to an NT questioner), and 55 of NT speech (from an NT respondent to an NT questioner). We found similarities between AUT speech and AUT-directed speech, and between NT speech and NT-directed speech. Prosody and interactions between prosodic, syllabic, and phonetic rhythms were significantly weaker in AUT-directed and AUT speech than in NT-directed and NT speech, respectively. AUT speech showed weaker dynamic processing from higher to lower phonological bands (e.g. from prosody to syllable) than NT speech. Further, we found that the weaker the frequency power of prosody in NT and AUT respondents, the weaker the frequency power of prosody in NT questioners. This suggests that NT individuals spontaneously imitate speech rhythms of the NT and AUT interlocutor. Although the speech sample of questioners came from just two NT individuals, our findings may suggest the possibility that the phonological characteristics of a speaker influence those of the interlocutor.

Emotional Ambience in Interaction Rituals: A Conceptional Completion to Emotional Energy

This article aims to elaborate on Collins’ theory of Interaction Ritual Chains by proposing the concept of emotional ambience as a complement to emotional energy. Interaction ritual chains describe how collective actions and shared cognitive and affective orientations within a group contribute to feelings of unity and reverence towards the group’s symbols. Successful interaction rituals generate emotional energy (EE), leading to increased self assurance, enthusiasm, and initiative. Conversely, unsuccessful rituals diminish EE. The concept of EE pertains to the long-term impact of interaction rituals on individuals beyond immediate contexts. To capture emotions created and diffused in social settings, the term emotional ambience is suggested. Emotional ambience focuses on the collective emotional process in an interaction situation, enhancing our understanding of how common sentiments are cultivated among actors during interaction rituals. To facilitate the analysis of emotional ambience, a three-dimensional model is proposed, considering the valence, arousal, and strength of collective emotions. Methodologically, the study focuses on the emotional coordination of various communication elements, such as gestures, facial expressions, tone of voice, and rhythm of speech. Understanding the separation of emotional energy and emotional ambience is crucial, as even the mutual sharing of unpleasant emotions can generate emotional energy and strengthen social bonds. The reciprocal relationship between emotional energy and emotional ambience highlights how individuals’ emotional energy influences the emotional ambience of interactional situations.

Free Verse and Prose Rhythm

AbstractFree verse and prose rhythms, by definition, do not have metrical organizing schemes, but does this mean that rhythm in free verse or prose poems is like speech or prose rhythm? Taking up these questions debated since the advent of modernist free verse more than one hundred years ago, this essay draws on recent critical literary and linguistic findings to formulate a new method for scanning and comparing rhythm in English-language free verse and prose genres. The comparison of six texts suggests that in poetic free verse or prose texts rhythm constructs information-rich, multilevel, context-specific semantic systems in a way that does not occur in the nonpoetic texts. These results contest persisting prosodic theories that free verse and prose poetry are largely written in prose, and suggest that rhythm is a more important generic marker of the poetic function than lineation is.

Linguistic prosody in autism spectrum disorder—An overview

AbstractLinguistic prosody involves the rhythm and melody of speech. It implicitly enhances or modifies the explicit meaning of spoken words. The literature on linguistic prosody related to autism spectrum disorder deals both with the production and perception of a broad range of linguistic functions. These functions range from the formal encoding of grammatical features (e.g. lexical stress, syntactic structure) to the less formal, more intuitive signalling of pragmatic or interactional aspects (speech acts, information structure, turn‐taking in conversation). This narrative review reports mixed results from 51 studies, with tentative evidence for greater differences in the perception of intuitive functions. Apart from considerable methodological differences across the different studies, much of the variability in the results is due to the wide range of ages investigated, since difficulties encountered by autistic children do not always persist into adulthood and compensatory strategies can be learnt for using prosody in communication.

ESSENCE OF A FOREIGN LANGUAGE TEACHER’S PEDAGOGICAL TECHNIQUE

The article reveals the essence of a foreign language teacher’s pedagogical technique as a system of professional techniques for organising a pedagogue’s behaviour to make successful pedagogical and educational influences on the personality of a higher education student. Depending on the direction of influence, external and internal pedagogical techniques have been distinguished. The external technique is associated with verbal and non-verbal expression of a teacher’s internal experiences in order to influence other subjects of the educational process. The technique of pedagogical communication and the technique of speech form the basis of the verbal tools of external technique. It has been determined that the technique of pedagogical communication requires a friendly, calm tone, the ability to ask questions, listen, analyse the content of the message, understand the motives of the interlocutor’s communicative behaviour, navigate in a communicational situation. Therefore, a foreign language teacher should strive to establish psychological and visual contact with other subjects of pedagogical interaction. The technique of pedagogical communication also contains the ability to attract students by the performance and free, coherent and logical speech, external expression of desire and willingness to communicate, the ability to convey their attitude to educational material, to arouse the higher education students’ interest in the discussion. The technique of speech consists of diction, articulation, intonation, volume, strength, height, timbre and tonality of the voice, pace and rhythm of speech, emphasis, mobility and sonority of the voice. The structural components of non-verbal communication: body language, interpersonal space, temporal characteristics have been analysed. The peculiarities of statistical and dynamic expression of a foreign language teacher have been described. Physiognomy, artefacts, the olfactory system, haptics, prosody, extralinguistics, kinesics have been characterised. It has been proved that a foreign language teacher’s pedagogical technique largely determines the level of professional excellence and the success of pedagogical activity. Pedagogical technique is an integral part in the structure of the professional excellence of a foreign language teacher who needs lifelong self-development and self-improvement. As a form of organisational behaviour, pedagogical technique is based on the ability to control oneself – posture, gestures, facial expressions, pantomime; to manage emotions – relieve excessive mental stress, trigger the states of insight, creative well-being; the ability to master the technique of speech – the pace of speech, intonation, audience management; the ability to interact with a higher education student and the group as a whole in the process of solving pedagogical problems. Forming foreign language teachers’ pedagogical technique is impossible without considering communicative prohibitions, etiquette, appearance culture, peculiarities of pedagogical communication and mental self-regulation. Verbal and non-verbal tools of influencing higher education students harmoniously complete each other, and mastery of the pedagogical technique testifies to the level of a pedagogue’s professional excellence.

MSA Speech Rhythm Pattern in a Multilingual Setting

This study examines variation in rhythm metrics in a multilingual setting by focusing on between-speaker differences. The investigation analyzes speech rhythm patterns of segmental durations in the speech of 77 Algerian speakers belonging to three educational background classes and three age groups. The experiment focuses on speech rhythm variability according to the level of educational background of the speakers and the language used in daily life. The gender and age of speakers are also analyzed. Results show that five vocalic rhythm metrics reflect the contrast between long and short vowels that was observed from the acoustic measurements. The statistical analysis reveals that rhythm metrics are sensitive to differences between groups of speakers, such as age and educational background. The outcomes also show that the lack of practice of Modern Standard Arabic by some speaker groups considerably affects vowel quantity.

Structure and Types of Pashto Syllable

The syllable is the phonological element that plays a vital role in the formation of the word. A complete and standard syllable consists of the Onset, Nucleus, and Coda, but at the same time, the Onset or Coda part of the syllable can also fall down. No syllable can be constructed without Nucleus and vowel sounds. The vowel in the syllable structure has as much value as the syllable has in the word formation. These vowels play a fundamental role in the syllable’s distribution and types. This article explores the intricate structure and various types of syllables found in the Pashto language, primarily spoken in Afghanistan. Syllables play a fundamental role in linguistic analysis, as they constitute the building blocks of words and affect the rhythm, stress, and intonation patterns in speech.
 The findings of this study contribute to a comprehensive understanding of the Pashto language's syllable structure, shedding light on its unique phonological features. This knowledge holds significance for various fields, including linguistics, language teaching, and speech pathology, enabling researchers and language professionals to better analyze and comprehend the complexities of Pashto syllables.

Neural phase angle from two months when tracking speech and non-speech rhythm linked to language performance from 12 to 24 months

Atypical phase alignment of low-frequency neural oscillations to speech rhythm has been implicated in phonological deficits in developmental dyslexia. Atypical phase alignment to rhythm could thus also characterize infants at risk for later language difficulties. Here, we investigate phase-language mechanisms in a neurotypical infant sample. 122 two-, six- and nine-month-old infants were played speech and non-speech rhythms while EEG was recorded in a longitudinal design. The phase of infants’ neural oscillations aligned consistently to the stimuli, with group-level convergence towards a common phase. Individual low-frequency phase alignment related to subsequent measures of language acquisition up to 24 months of age. Accordingly, individual differences in language acquisition are related to the phase alignment of cortical tracking of auditory and audiovisual rhythms in infancy, an automatic neural mechanism. Automatic rhythmic phase-language mechanisms could eventually serve as biomarkers, identifying at-risk infants and enabling intervention at the earliest stages of development.

Handwritten Text Recognition and Conversion to Speech

Abstract: Handwritten text recognition and conversion to speech is a complex task that involves multiple stages and technologies. The process begins with image processing, where the handwritten text is captured and pre-processed to enhance its quality and remove any noise. The next step is to perform optical character recognition (OCR), which involves recognizing individual characters in the text and converting them into a digital form that can be processed by a computer. Once the text has been digitized, it is processed by natural language processing (NLP) algorithms to identify and extract relevant information, such as dates, names, and numbers. The final step is to convert the digitized text into speech using text-to-speech (TTS) technology. This involves synthesizing a spoken language representation of the text, typically using machine learning algorithms to model the pronunciation and rhythm of human speech. Overall, handwritten text recognition and conversion to speech is a challenging task that requires a combination of image processing, OCR, NLP, and TTS technologies. However, advances in these fields have made it possible to create systems that can accurately recognize and convert handwritten text into speech with high levels of accuracy

Atypical speech production of multisyllabic words and phrases by children with developmental dyslexia.

The prevalent "core phonological deficit" model of dyslexia proposes that the reading and spelling difficulties characterizing affected children stem from prior developmental difficulties in processing speech sound structure, for example, perceiving and identifying syllable stress patterns, syllables, rhymes and phonemes. Yet spoken word production appears normal. This suggests an unexpected disconnect between speech input and speech output processes. Here we investigated the output side of this disconnect from a speech rhythm perspective by measuring the speech amplitude envelope (AE) of multisyllabic spoken phrases. The speech AE contains crucial information regarding stress patterns, speech rate, tonal contrasts and intonational information. We created a novel computerized speech copying task in which participants copied aloud familiar spoken targets like "Aladdin." Seventy-five children with and without dyslexia were tested, some of whom were also receiving an oral intervention designed to enhance multi-syllabic processing. Similarity of the child's productions to the target AE was computed using correlation and mutual information metrics. Similarity of pitch contour, another acoustic cue to speech rhythm, was used for control analyses. Children with dyslexia were significantly worse at producing the multi-syllabic targets as indexed by both similarity metrics for computing the AE. However, children with dyslexia were not different from control children in producing pitch contours. Accordingly, the spoken production of multisyllabic phrases by children with dyslexia is atypical regarding the AE. Children with dyslexia may not appear to listeners to exhibit speech production difficulties because their pitch contours are intact. RESEARCH HIGHLIGHTS: Speech production of syllable stress patterns is atypical in children with dyslexia. Children with dyslexia are significantly worse at producing the amplitude envelope of multi-syllabic targets compared to both age-matched and reading-level-matched control children. No group differences were found for pitch contour production between children with dyslexia and age-matched control children. It may be difficult to detect speech output problems in dyslexia as pitch contours are relatively accurate.

A Visual Speech Intelligibility Benefit Based on Speech Rhythm

This study examined whether visual speech provides speech-rhythm information that perceivers can use in speech perception. This was tested by using speech that naturally varied in the familiarity of its rhythm. Thirty Australian English L1 listeners performed a speech perception in noise task with English sentences produced by three speakers: an English L1 speaker (familiar rhythm); an experienced English L2 speaker who had a weak foreign accent (familiar rhythm), and an inexperienced English L2 speaker who had a strong foreign accent (unfamiliar speech rhythm). The spoken sentences were presented in three conditions: Audio-Only (AO), Audio-Visual with mouth covered (AVm), and Audio-Visual (AV). Speech was best recognized in the AV condition regardless of the degree of foreign accent. However, speech recognition in AVm was better than AO for the speech with no foreign accent and with a weak accent, but not for the speech with a strong accent. A follow-up experiment was conducted that only used the speech with a strong foreign accent, under more audible conditions. The results also showed no difference between the AVm and AO conditions, indicating the null effect was not due to a floor effect. We propose that speech rhythm is conveyed by the motion of the jaw opening and closing, and perceivers use this information to better perceive speech in noise.

A Silent Disco: Differential Effects of Beat-based and Pattern-based Temporal Expectations on Persistent Entrainment of Low-frequency Neural Oscillations.

The brain uses temporal structure in the environment, like rhythm in music and speech, to predict the timing of events, thereby optimizing their processing and perception. Temporal expectations can be grounded in different aspects of the input structure, such as a regular beat or a predictable pattern. One influential account posits that a generic mechanism underlies beat-based and pattern-based expectations, namely, entrainment of low-frequency neural oscillations to rhythmic input, whereas other accounts assume different underlying neural mechanisms. Here, we addressed this outstanding issue by examining EEG activity and behavioral responses during silent periods following rhythmic auditory sequences. We measured responses outlasting the rhythms both to avoid confounding the EEG analyses with evoked responses, and to directly test whether beat-based and pattern-based expectations persist beyond stimulation, as predicted by entrainment theories. To properly disentangle beat-based and pattern-based expectations, which often occur simultaneously, we used non-isochronous rhythms with a beat, a predictable pattern, or random timing. In Experiment 1 (n = 32), beat-based expectations affected behavioral ratings of probe events for two beat-cycles after the end of the rhythm. The effects of pattern-based expectations reflected expectations for one interval. In Experiment 2 (n = 27), using EEG, we found enhanced spectral power at the beat frequency for beat-based sequences both during listening and silence. For pattern-based sequences, enhanced power at a pattern-specific frequency was present during listening, but not silence. Moreover, we found a difference in the evoked signal following pattern-based and beat-based sequences. Finally, we show how multivariate pattern decoding and multiscale entropy-measures sensitive to non-oscillatory components of the signal-can be used to probe temporal expectations. Together, our results suggest that the input structure used to form temporal expectations may affect the associated neural mechanisms. We suggest climbing activity and low-frequency oscillations may be differentially associated with pattern-based and beat-based expectations.

Jagger, Jasmine. Rhythms of Feeling in Edward Lear, T. S. Eliot, and Stevie Smith

At the heart of this book are a very alert, informed listening to the music of poetry and a focus on how it communicates and contains emotion. Attentive to various kinds of worry and intense anxiety – Edward Lear’s ‘morbids’, T. S. Eliot’s ‘nerves’ and Stevie Smith’s ‘scratches’ – Jasmine Jagger examines how each of these three poets draws on imagery and acoustic devices that might appear ridiculous, but in fact serve to communicate emotional disturbance beyond the bounds of what is considered ‘normal’. In particular, Jagger shows that an edgy interplay between the often unsettling rhythms of speech and the measured predictability of metre allows poets to hear and feel in their work emotions that they are impelled to communicate, and lets readers hear and feel these too. This is an unusually writerly book, and, in its nuanced sense of verse, an outstanding study. While not engaging with the work of Rita Felski and a number of other American-influenced writers on ‘affect’, Jagger takes some of her theoretical bearings from Isobel Armstrong, Derek Attridge, Christopher Ricks, Ann Stillman and other (mainly British) critics alert to the fusion of emotion and word-music. Jagger is not afraid to draw on biographical, anthropological and psychological material as she articulates her close readings and close listenings to poems as apparently different as ‘The Dong with a Luminous Nose’, ‘The Love Song of J. Alfred Prufrock’ and ‘Not Waving But Drowning’. Without in any way reducing her chosen poets to one template, she shows how, by exploring ‘individual tendernesses as dramatized by poetic rhythm’, these poets demonstrate the ways in which ‘poetic composition can also indicate an attempt to translate affect into a bodily state. In so doing, affective poetics becomes a way for poets to plumb their own depths, reconnecting with, and becoming tender to, their emotional complexity’ (p. 202).

The effect of rhythm on selective listening in multiple-source environments for young and older adults

Understanding continuous speech with competing background sounds is challenging, particularly for older adults. One stimulus property that may aid listeners understanding of to-be-attended (target) material is temporal regularity (rhythm). In the context of speech-in-noise understanding, McAuley and colleagues recently showed a target rhythm effect whereby recognition of target speech was better when natural speech rhythm of a target talker was intact than when it was temporally altered. The current study replicates the target rhythm effect using a synthetic vowel sequence paradigm in young adults (Experiment 1) and then uses this paradigm to investigate potential age-related changes in the effect of rhythm on recognition (Experiment 2). Listeners identified the last three vowels of temporally regular (isochronous) and irregular (anisochronous) synthetic vowel sequences in quiet and with a competing background sequence of vowel-like harmonic tone complexes presented at various tempos. The results replicated the target rhythm effect whereby temporal regularity in the vowel sequences improved identification accuracy of young listeners compared to irregular vowel sequences. The magnitude of the effect was not found to be influenced by background tempo, but faster background tempos led to greater vowel identification accuracy independent of regularity. Older listeners also demonstrated a target rhythm effect but received less benefit from the temporal regularity of the target sequences than did young listeners. This study highlights the importance of rhythm for understanding age-related differences in selective listening in complex environments and provides a novel paradigm for investigating effects of rhythm on perception.

Differential sensitivity to speech rhythms in young and older adults.

Sensitivity to the temporal properties of auditory patterns tends to be poorer in older listeners, and this has been hypothesized to be one factor contributing to their poorer speech understanding. This study examined sensitivity to speech rhythms in young and older normal-hearing subjects, using a task designed to measure the effect of speech rhythmic context on the detection of changes in the timing of word onsets in spoken sentences. A temporal-shift detection paradigm was used in which listeners were presented with an intact sentence followed by two versions of the sentence in which a portion of speech was replaced with a silent gap: one with correct gap timing (the same duration as the missing speech) and one with altered gap timing (shorter or longer than the duration of the missing speech), resulting in an early or late resumption of the sentence after the gap. The sentences were presented with either an intact rhythm or an altered rhythm preceding the silent gap. Listeners judged which sentence had the altered gap timing, and thresholds for the detection of deviations from the correct timing were calculated separately for shortened and lengthened gaps. Both young and older listeners demonstrated lower thresholds in the intact rhythm condition than in the altered rhythm conditions. However, shortened gaps led to lower thresholds than lengthened gaps for the young listeners, while older listeners were not sensitive to the direction of the change in timing. These results show that both young and older listeners rely on speech rhythms to generate temporal expectancies for upcoming speech events. However, the absence of lower thresholds for shortened gaps among the older listeners indicates a change in speech-timing expectancies with age. A further examination of individual differences within the older group revealed that those with better rhythm-discrimination abilities (from a separate study) tended to show the same heightened sensitivity to early events observed with the young listeners.

Effects of Syllable Rate on Neuro-Behavioral Synchronization Across Modalities: Brain Oscillations and Speech Productions.

Considerable work suggests the dominant syllable rhythm of the acoustic envelope is remarkably similar across languages (∼4-5 Hz) and that oscillatory brain activity tracks these quasiperiodic rhythms to facilitate speech processing. However, whether this fundamental periodicity represents a common organizing principle in both auditory and motor systems involved in speech has not been explicitly tested. To evaluate relations between entrainment in the perceptual and production domains, we measured individuals' (i) neuroacoustic tracking of the EEG to speech trains and their (ii) simultaneous and non-simultaneous productions synchronized to syllable rates between 2.5 and 8.5 Hz. Productions made without concurrent auditory presentation isolated motor speech functions more purely. We show that neural synchronization flexibly adapts to the heard stimuli in a rate-dependent manner, but that phase locking is boosted near ∼4.5 Hz, the purported dominant rate of speech. Cued speech productions (recruit sensorimotor interaction) were optimal between 2.5 and 4.5 Hz, suggesting a low-frequency constraint on motor output and/or sensorimotor integration. In contrast, "pure" motor productions (without concurrent sound cues) were most precisely generated at rates of 4.5 and 5.5 Hz, paralleling the neuroacoustic data. Correlations further revealed strong links between receptive (EEG) and production synchronization abilities; individuals with stronger auditory-perceptual entrainment better matched speech rhythms motorically. Together, our findings support an intimate link between exogenous and endogenous rhythmic processing that is optimized at 4-5 Hz in both auditory and motor systems. Parallels across modalities could result from dynamics of the speech motor system coupled with experience-dependent tuning of the perceptual system via the sensorimotor interface.

Hugo, Translated: The Measures of Modernity in Muḥammad Rūḥī al-Khālidī's Poetics of Comparative Literature

AbstractIn the Ottoman-Palestinian intellectual Muḥammad Rūḥī al-Khālidī's Tārīkh ʿIlm al-Adab ʿind al-Ifranj wa-l-ʿArab, wa-Fīktūr Hūkū (1904, 2nd ed. 1912; History of the Science of Literature among the Europeans and the Arabs, and Victor Hugo), the figure of Victor Hugo marks the uneven chime and dissonance of select notes in Arabic and French literary epistemes and histories. Tracing Hugo's dictum that poetry inheres not in forms but in ideas to Arab-Islamic antiquity, al-Khālidī incarnates in Hugo the lost “nature” to which a fallen, “artificial” Arabic literature must return. In this regime of comparability, words must be cut to the measure of their meaning, and meter—poetic measure—tuned to the “natural” rhythms of speech. With al-Khālidī's translations of meter across time and language, this essay reads his translations of Hugo's theory and poetry (“Grenade”) to argue that the underlying concept of measure encodes a drive to equate the world's literatures and empires.

Speech and gait abnormalities in motor subtypes of de-novo Parkinson's disease.

To investigate the presence and relationship of temporal speech and gait parameters in patients with postural instability/gait disorder (PIGD) and tremor-dominant (TD) motor subtypes of Parkinson's disease (PD). Speech samples and instrumented walkway system assessments were acquired from a total of 60 de-novo PD patients (40 in TD and 20 in PIGD subtype) and 40 matched healthy controls. Objective acoustic vocal assessment of seven distinct speech timing dimensions was related to instrumental gait measures including velocity, cadence, and stride length. Compared to controls, PIGD subtype showed greater consonant timing abnormalities by prolonged voice onset time (VOT) while also shorter stride length during both normal walking and dual task, while decreased velocity and cadence only during dual task. Speaking rate was faster in PIGD than TD subtype. In PIGD subtype, prolonged VOT correlated with slower gait velocity (r=-0.56, p=0.01) and shorter stride length (r=-0.59, p=0.008) during normal walking, whereas relationships were also found between decreased cadence in dual task and irregular alternating motion rates (r=-0.48, p=0.04) and prolonged pauses (r=-0.50, p=0.03). No correlation between speech and gait was detected in TD subtype. Our findings suggest that speech and gait rhythm disorder share similar underlying pathomechanisms specific for PIGD subtype.

Multilingual evaluation of interpretable biomarkers to represent language and speech patterns in Parkinson's disease.

Motor impairments are only one aspect of Parkinson's disease (PD), which also include cognitive and linguistic impairments. Speech-derived interpretable biomarkers may help clinicians diagnose PD at earlier stages and monitor the disorder's evolution over time. This study focuses on the multilingual evaluation of a composite array of biomarkers that facilitate PD evaluation from speech. Hypokinetic dysarthria, a motor speech disorder associated with PD, has been extensively analyzed in previously published studies on automatic PD evaluation, with a relative lack of inquiry into language and task variability. In this study, we explore certain acoustic, linguistic, and cognitive information encoded within the speech of several cohorts with PD. A total of 24 biomarkers were analyzed from American English, Italian, Castilian Spanish, Colombian Spanish, German, and Czech by conducting a statistical analysis to evaluate which biomarkers best differentiate people with PD from healthy participants. The study leverages conceptual robustness as a criterion in which a biomarker behaves the same, independent of the language. Hence, we propose a set of speech-based biomarkers that can effectively help evaluate PD while being language-independent. In short, the best acoustic and cognitive biomarkers permitting discrimination between experimental groups across languages were fundamental frequency standard deviation, pause time, pause percentage, silence duration, and speech rhythm standard deviation. Linguistic biomarkers representing the length of the narratives and the number of nouns and auxiliaries also provided discrimination between groups. Altogether, in addition to being significant, these biomarkers satisfied the robustness requirements.