Iambic Stress Research Articles

Turkish EFL learners’ knowledge, perception, and production of suprafixes as part of lexical competence

Vocabulary and grammar are essential to language proficiency (Richards, 2015). Some word families and grammatical categories can only be distinguished by prosodic properties such as suprafixes. In English, specific noun/adjective-verb pairs, sometimes called disyllabic words, receive primary stress on different syllables. Typically, nouns receive trochaic stress, while verbs receive iambic stress. Research shows that suprafixes are difficult for language learners from diverse linguistic and prosodic backgrounds. Given the scarcity of research in specific contexts (e.g., Turkish EFL), this study explored Turkish EFL learners’ suprafixational knowledge, perception, and production. Participants were B1-level preparatory school students of a prominent state university. Data were collected through a test of knowledge (n=110), a test of perception (n=80), and a test of production (n=50). Results showed poor knowledge, perception, and production of suprafixes among Turkish EFL learners. Minor variations in suprafixational competence were observed in males and females. Additionally, different noun-verb pairs posed a challenge for both genders. The results were discussed, and recommendations for future research were made. The study concludes that Turkish EFL learners must receive suprasegmental training focusing on suprafixes.

Development of language-specific stress discrimination in European Portuguese: an electrophysiological study.

European Portuguese (EP) is a language with unpredictable stress. Previous behavioral studies have shown that without vowel reduction EP adult speakers displayed a stress deafness effect akin to that observed in speakers of fixed-stress languages, suggesting that vowel quality may be the primary cue for stress discrimination in EP. However, an event-related potentials (ERPs) study reported that EP adults were able to discriminate stress contrasts pre-attentively in the absence of vowel quality cues. These results seemed to indicate that EP adult speakers may attend to different cues in the attentive and pre-attentive stress perception. Moreover, both the behavioral and ERPs studies have revealed a processing advantage for iambic stress, which could not be predicted by the rhythmic properties of EP, the language-specific weighting of stress correlates, or the frequency distributions of trochaic and iambic stresses in EP. A recent eye-tracking study has found that EP-learning infants at 5-6 months already exhibited an iambic preference in the absence of vowel reduction, manifested by longer looking time at the iambic stress. The present study used a passive oddball paradigm to examine pre-attentive stress perception without vowel quality cues by 5-to-7-month-old EP-learning infants. Results from twenty-two participants showed that both the trochaic and iambic conditions yielded a positive discrimination response (p-MMR). In addition, the iambic condition elicited a prominent late discriminative negativity (LDN) as well as a P3a component. Our findings present the first evidence for reciprocal discrimination of stress patterns in EP-learning infants, showing that, as in adult speakers, stress processing might also differ at the pre-attentive and attentive stages in infants. Importantly, the stress perception ability in EP-learning infants seems to develop asymmetrically, with an advantage for the iambic stress pattern. The present study highlighted the role of language-specific factors that may affect developing stress perception.

An acoustic study of Tetsǫ́t’ıné stress: Iambic stress in a quantity-sensitive tone language

AbstractThis paper presents both distributional and acoustic phonetic evidence for iambic stress in Tetsǫ́t'ıné (ISO: CHP), a Dene (Athapaskan) language with contrastive vowel length and four contrastive tones. In our acoustic study, we find that the primary correlate of stress in Tetsǫ́t'ıné is duration, whereas intensity plays a secondary but statistically significant role. There was no statistically significant effect on F0 in our results. We discuss our results in relation to several proposals regarding the typology of stress systems. Based on the Functional Load Hypothesis (Berinstein 1979) and Dispersion Theory (Flemming 1995, 2001), we find that our results are to some extent unexpected. We suggest that our results are most consistent with the Iambic–Trochaic Law (Hayes 1995), which predicts that iambic stress systems prefer to use duration as their primary stress correlate.

In Time with the Beat: Entrainment in Patients with Phonological Impairment, Apraxia of Speech, and Parkinson's Disease.

In the present study, we investigated if individuals with neurogenic speech sound impairments of three types, Parkinson’s dysarthria, apraxia of speech, and aphasic phonological impairment, accommodate their speech to the natural speech rhythm of an auditory model, and if so, whether the effect is more significant after hearing metrically regular sentences as compared to those with an irregular pattern. This question builds on theories of rhythmic entrainment, assuming that sensorimotor predictions of upcoming events allow humans to synchronize their actions with an external rhythm. To investigate entrainment effects, we conducted a sentence completion task relating participants’ response latencies to the spoken rhythm of the prime heard immediately before. A further research question was if the perceived rhythm interacts with the rhythm of the participants’ own productions, i.e., the trochaic or iambic stress pattern of disyllabic target words. For a control group of healthy speakers, our study revealed evidence for entrainment when trochaic target words were preceded by regularly stressed prime sentences. Persons with Parkinson’s dysarthria showed a pattern similar to that of the healthy individuals. For the patient groups with apraxia of speech and with phonological impairment, considerably longer response latencies with differing patterns were observed. Trochaic target words were initiated with significantly shorter latencies, whereas the metrical regularity of prime sentences had no consistent impact on response latencies and did not interact with the stress pattern of the target words to be produced. The absence of an entrainment in these patients may be explained by the more severe difficulties in initiating speech at all. We discuss the results in terms of clinical implications for diagnostics and therapy in neurogenic speech disorders.

Towards a Native OPERA Hypothesis: Musicianship and English Stress Perception.

Musical experience facilitates speech perception. French musicians, to whom stress is foreign, have been found to perceive English stress more accurately than French non-musicians. This study investigated whether this musical advantage also applies to native listeners. English musicians and non-musicians completed an English stress discrimination task and two control tasks. With age, non-verbal intelligence and short-term memory controlled, the musicians exhibited a perceptual advantage relative to the non-musicians. This perceptual advantage was equally potent to both trochaic and iambic stress patterns. In terms of perceptual strategy, the two groups showed differential use of acoustic cues for iambic but not trochaic stress. Collectively, the results could be taken to suggest that musical experience enhances stress discrimination even among native listeners. Remarkably, this musical advantage is highly consistent and does not particularly favour either stress pattern. For iambic stress, the musical advantage appears to stem from the differential use of acoustic cues by musicians. For trochaic stress, the musical advantage may be rooted in enhanced durational sensitivity.

European Portuguese-Learning Infants Look Longer at Iambic Stress: New Data on Language Specificity in Early Stress Perception.

The ability to perceive lexical stress patterns has been shown to develop in language-specific ways. However, previous studies have examined this ability in languages that are either clearly stress-based (favoring the development of a preference for trochaic stress, like English and German) or syllable-based (favoring the development of no stress preferences, like French, Spanish, and Catalan) and/or where the frequency distributions of stress patterns provide clear data for a predominant pattern (like English and Hebrew). European Portuguese (EP) is a different type of language, which presents conflicting sets of cues related to rhythm, frequency, and stress correlates that challenge existing accounts of early stress perception. Using an anticipatory eye movement (AEM) paradigm implemented with eye-tracking, EP-learning infants at 5–6 months demonstrated sensitivity to the trochaic/iambic stress contrast, with evidence of asymmetrical perception or preference for iambic stress. These results are not predicted by the rhythmic account of developing stress perception, and suggest that the language-particular phonological patterns impacting the frequency of trochaic and iambic stress, beyond lexical words with two or more syllables, together with the prosodic correlates of stress, drive the early acquisition of lexical stress. Our findings provide the first evidence of sensitivity to stress patterns in the presence of segmental variability by 5–6 months, and highlight the importance of testing developing stress perception in languages with diverse combinations of rhythmic, phonological, and phonetic properties.

Eyes or mouth? Exploring eye gaze patterns and their relation with early stress perception in European Portuguese

Previous research has shown that eye gaze patterns relate to language development, with more attention to the mouth signaling ongoing acquisition. We examined infants’ eye gaze in a stress perception experiment, in which European Portuguese (EP) learning infants showed a preference for the iambic stress pattern. Specifically, we asked whether there was a relation between eye gaze patterns and the preferred stress pattern. Eye gaze patterns of 25 monolingual typically developing infants aged 5–6 months old were examined using eye-tracking. Our results show that, although an interaction between looks to the area of interest (face, eyes, mouth, and arm) and stress preference was not found, eye gaze to the mouth region (and to the face) was modulated by the stress pattern, with more attention to the mouth in infants that do not show an iambic preference. These findings add further support for infants’ use of eye gaze in early language development. They also highlight the need for multimodal approaches for a better understanding of language development. In the particular case of the challenging topic of the acquisition of stress in European Portuguese, they provide converging evidence for an advantage of iambic stress in early development. (195 words).

Kashaya Foot Extrametricality as Post-Accentuation

Kashaya, an endangered Pomoan language of northern California, has an iambic stress pattern, assigned within words and phrases. Accent regularly shifts rightward from a (CV:) foot onto the following foot, including opaque contexts when length is lost or moved by other processes. This paper brings into the analysis a class of lexical triggers of accent shift: specific stems with no long vowels on the surface that nonetheless also trigger this shift. I propose an analysis of all varieties of accent shift as alignment of constituents, requiring the head foot to follow the triggering foot. Particular evidence for alignment comes from the fact that it is blocked by phrasal resyllabification of a word-final consonant. I argue for a unified analysis of all cases that employs a diacritic at the level of the foot, which also provides an account for opacity.

A shift of treatment approach in speech language pathology services for children with speech sound disorders – a single case study of an intense intervention based on non-linear phonology and motor-learning principles

ABSTRACTEven though there are documented benefits of direct intensive intervention for children with speech sound disorders (SSDs), the intensity given at Swedish Speech Language Pathology services rarely exceeds once a week. Also, indirect therapy approaches are commonly employed.The purpose of the present case study was to investigate the effects of an intensive specialist therapy, based on non-linear phonological analysis and motor learning principles. The participant was a boy aged 4:10 years with severe SSD, who previously had received indirect therapy from age 3 with, very limited results.A single subject ABA design was used. At baseline, whole word match was 0%, Word shape CV match was 39% and PCC was 22, 7%. He had no multisyllabic words, no consonant clusters and no established coronals.Intervention was given 4 days weekly for 3 weeks in two periods with a 7-week intervening break and a post therapy assessments. Therapy was focused on establishing multisyllabic words, iambic stress pattern, clusters and coronals with the principle of using already established elements for targeting new elements.At post therapy assessment, whole word match was 39%, word shape CV match was 71% and PCC 69.1%. Multisyllabic words (86%), coronals (82%) and word initial clusters (80%) were established. Without being targeted, back vowels were also present and segment timing improved.The strong treatment effects of this study demonstrate that at least severe cases of SSD require the clinical knowledge and skills that only a SLP can provide and that frequent direct therapy is both beneficial and needed.

Revisiting Stress "Deafness" in European Portuguese - A Behavioral and ERP Study.

European Portuguese (EP) is a language with variable stress, and the main cues for stress are duration and vowel reduction. A previous behavioral study has reported a stress “deafness” effect in EP when vowel quality cues are unavailable. The present study recorded both event-related potentials (ERPs) and behavioral data to examine the stress processing by native EP speakers in the absence of the vowel quality cues. Our behavioral result was consistent with previous research, showing that when vowel reduction is absent EP speakers demonstrated a stress “deafness” effect similar to that found in speakers of languages with fixed stress or without any lexical stress marking. In the ERP task, both the trochaic and iambic conditions yielded mismatch negativity (MMN) and late negativity, suggesting that EP speakers are able to discriminate the two stress patterns without vowel reduction at the pre-attentive stage. Moreover, the ERP and behavioral data revealed compatible results regarding the pattern of stress bias in EP. In the EPR task, the MMN and late negativity components were more negative and span over a larger temporal window in the iambic condition than in the trochaic condition, indicating a higher sensitivity for the iambic stress pattern. In the behavioral task, EP speakers responded more accurately and more quickly to the iambic stress. These results match recent developmental findings in the acquisition of stress, but speak against the dominant view in EP phonological literature which assumes penultimate stress to be the regular stress pattern. In addition, both the ERP and the behavioral data showed that EP speakers’ stress processing was influenced by their working memory (WM) capacity. The participants with high WM capacity outperformed the participants with limited WM capacity in the iambic condition. In sum, our results broaden the current knowledge on stress processing by EP speakers at both the pre-attentive and attentive levels.

Does lexical stress influence 17-month-olds' mapping of verbs and nouns?

English-learning infants attend to lexical stress when learning new words. Attention to lexical stress might be beneficial for word learning by providing an indication of the grammatical class of that word. English disyllabic nouns commonly have trochaic (strong-weak) stress, whereas English disyllabic verbs commonly have iambic (weak-strong) stress. We explored whether 17-month-old infants use word stress to resolve an ambiguous labeling event where objects and actions are equally plausible referents. Infants were habituated to 2 words paired with 2 objects, with each object performing a distinct path action. They were subsequently tested on (a) a change in object but not path action or (b) a change in path action but not the object. When infants were taught verb-friendly iambic labels, their looking times increased both when the action switched and when the object switched. Infants who were taught noun-friendly trochaic labels demonstrated an increase in looking time only when the object switched. These results demonstrate that in ambiguous labeling events infants map iambic labels to both actions and objects, and trochaic labels to the objects but not to the actions, suggesting a bias for words with trochaic stress to refer to objects. Seventeen-month-old infants can use trochaic lexical stress to guide their word learning in ambiguous situations, but iambic stress cues may not preferentially guide infants' mappings of actions or objects. (PsycINFO Database Record

Delayed silent phoneme monitoring in adults who do and do not stutter

ABSTRACT Previous research employed silent phoneme monitoring tasks to examine differences in phonological encoding in adults who stutter (AWS) compared to adults who do not stutter (AWNS). The primary purpose of this study was to apply a modified version of the task – the delayed silent phoneme monitoring task – to examine the integrity of the phonological speech plan within working memory in AWS and AWNS before and after subvocal rehearsal. The secondary purpose of this study was to examine whether group differences were more apparent when greater phonological demand was placed upon phonological working memory. In Experiment 1, 20 adults (10 AWNS, 10 AWS) identified target phonemes within trochaic nonwords held in memory before the initiation of subvocal rehearsal (1 s) and after subvocal rehearsal (4 s). In Experiment 2, an additional 20 adults (10 AWNS, 10 AWS) monitored identical nonwords with low-frequency iambic stress. Speed and accuracy of manual response was measured, as well as post-trial verbal productions. Both groups identified the initial phoneme of trochaic stimuli fastest, irrespective of stress, and both groups monitored phonemes faster after the 4 s delay. However, AWS identified phonemes within iambic stimuli with less accuracy than AWNS. Group differences in monitoring errors were most evident for phonemes immediately following syllable boundary, and after subvocal rehearsal. Preliminary findings suggest AWS may exhibit distinct difficulties relative to AWNS when accessing segmental information after subvocal rehearsal is required, but only when target words are more phonologically demanding (i.e., low-frequency iambic stress).

Lexical tone in Deori: loss, contrast and word based alignment

In this paper we investigate the existence of tones in Deori, a language which is historically known to have had tonal distinctions. In a study, 5 speakers were recorded for their production of potential lexical tones in a list of 34 words, and a list of 54 monosyllabic roots were recorded for a vowel experiment. We conducted an f0 analysis in order to examine the extent of ‘tonoexodus’ and loss of tonal properties in Deori. To the extent that experimental methods can be used to determine lexical tone, phonetic measurements of f0 and further statistical analysis reliably indicate the distribution of lexically distinct tones. The results show clear presence of tonally distinctive words but without any definitive tonal alignment. We consider the diachrony and synchronic analysis of this and conclude that the syllable is not the Tone Bearing Unit in the conventional sense in current Deori, and that there is no clinching evidence to suggest alignment and spreading of the lexically distinctive tone to the right edge. Given these results, we conclude that tone is spread in the entire word in Deori. We also note that Deori no longer exhibits the prototypical Tibeto-Burman sesquisyllabic pattern and has instead developed an iambic stress pattern.

Revisiting English word stress and rhythm in the post-nuclear domain

In English, grammatical category and word stress are often highly correlated: disyllabic nouns and verbs frequently occur with trochaic and iambic stress, respectively. Kelly and colleagues (1988,1992) suggest that this relationship was shaped by rhythm but may also be subverted by rhythm. We revisit a 1978 production study by Huss, who argued that the usual stress correlation is neutralized in postnuclear position and that acoustic differences are subject to effects of sentence rhythm. Twelve pairs of homophones were embedded in full sentences preceded by a possessive or plural noun with ultimate or penultimate stress: e.g. farms produce, farm’s produce, farmers produce, farmer’s produce. A postnuclear environment was elicited by prepending a contrastive sentence (e.g., Some say that only supermarket produce may vary in quality but also a farmer’s produce may vary in quality.) Results suggest, contra Huss, that prosodic differences between nouns and verbs persist in the postnuclear environment, despite effects of rhythm. In a mixed-effects logistic regression (N = 18), acoustic cues of syllable duration and maximum intensity were significant predictors of part of speech in nuclear and postnuclear position. We also discuss results of a perception experiment in progress using the production stimuli.

The Perception of Stress Pattern in Young Cochlear Implanted Children: An EEG Study.

Children with sensorineural hearing loss may (re)gain hearing with a cochlear implant—a device that transforms sounds into electric pulses and bypasses the dysfunctioning inner ear by stimulating the auditory nerve directly with an electrode array. Many implanted children master the acquisition of spoken language successfully, yet we still have little knowledge of the actual input they receive with the implant and specifically which language sensitive cues they hear. This would be important however, both for understanding the flexibility of the auditory system when presented with stimuli after a (life-) long phase of deprivation and for planning therapeutic intervention. In rhythmic languages the general stress pattern conveys important information about word boundaries. Infant language acquisition relies on such cues and can be severely hampered when this information is missing, as seen for dyslexic children and children with specific language impairment. Here we ask whether children with a cochlear implant perceive differences in stress patterns during their language acquisition phase and if they do, whether it is present directly following implant stimulation or if and how much time is needed for the auditory system to adapt to the new sensory modality. We performed a longitudinal ERP study, testing in bimonthly intervals the stress pattern perception of 17 young hearing impaired children (age range: 9–50 months; mean: 22 months) during their first 6 months of implant use. An additional session before the implantation served as control baseline. During a session they passively listened to an oddball paradigm featuring the disyllable “baba,” which was stressed either on the first or second syllable (trochaic vs. iambic stress pattern). A group of age-matched normal hearing children participated as controls. Our results show, that within the first 6 months of implant use the implanted children develop a negative mismatch response for iambic but not for trochaic deviants, thus showing the same result as the normal hearing controls. Even congenitally deaf children show the same developing pattern. We therefore conclude (a) that young implanted children have early access to stress pattern information and (b) that they develop ERP responses similar to those of normal hearing children.

Asymmetric Correlations between English Verb Transitivity and Stress

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The Relationship between Language Production and Verbal Short-Term Memory: The Role of Stress Grouping

This study investigates the influence of stress grouping on verbal short-term memory (STM). English speakers show a preference to combine syllables into trochaic groups, both lexically and in continuous speech. In two serial recall experiments, auditory lists of nonsense syllables were presented with either trochaic (STRONG-weak) or iambic (weak-STRONG) stress patterns, or in monotone. The acoustic correlates that carry stress were also manipulated in order to examine the relationship between input and output processes during recall. In Experiment 1, stressed and unstressed syllables differed in intensity and pitch but were matched for spoken duration. Significantly more syllables were recalled in the trochaic stress pattern condition than in the iambic and monotone conditions, which did not differ. In Experiment 2, spoken duration and pitch were manipulated but intensity was held constant. No effects of stress grouping were observed, suggesting that intensity is a critical acoustic factor for trochaic grouping. Acoustic analyses demonstrated that speech output was not identical to the auditory input, but that participants generated correct stress patterns by manipulating acoustic correlates in the same way in both experiments. These data challenge the idea of a language-independent STM store and support the notion of separable phonological input and output processes.

Effect of native Mandarin dialects on English learners’ use of prosodic cues to stress

Second-language learners (L2ers) weight phonetic cues to stress as a function of how these cues are used in the native language. This study investigates the effect of native dialects on the use of prosodic cues (F0 and duration) to English stress by native speakers (NSs) of Standard Mandarin (SM), Taiwanese Mandarin (TM), and English. Both TM and SM use F0 to realize lexical tones, but only SM uses duration to realize lexically contrastive stressed-unstressed vs stressed-stressed words. English NSs and intermediate-to-advanced TM-speaking or SM-speaking L2ers of English (at the same English proficiency) completed two sequence-recall tasks. In each trial, they heard four English non-words with trochaic and iambic stress, and pressed “1” and “2” to recall them in the correct order. In Experiment 1, participants heard natural stimuli (converging F0 and duration cues); in Experiment 2, the stress stimuli were resynthesized to contain only F0 cues, only duration cues, converging F0 and duration cues, or conflicting F0 and duration cues. In Experiment 1, all groups used naturally produced stress to recall English non-words. In Experiment 2, SM-speaking L2ers used duration more than TM-speaking L2ers to recall English non-words. Native dialect is suggested to be considered in L2 speech processing models.

Attention to lexical stress and early vocabulary growth in 5-month-olds at risk for autism spectrum disorder

Typically developing infants differentiate strong–weak (trochaic) and weak–strong (iambic) stress patterns by 2months of age. The ability to discriminate rhythmical patterns, such as lexical stress, has been argued to facilitate language development, suggesting that a difficulty in discriminating stress might affect early word learning as reflected in vocabulary size. Children with autism spectrum disorder (ASD) often have difficulty in correctly producing lexical stress, yet little is known about how they perceive it. The current study tested 5-month-old infants with typically developing older siblings (SIBS-TD) and infants with an older sibling diagnosed with ASD (SIBS-A) on their ability to differentiate the trochaic and iambic stress patterns of the word form gaba. SIBS-TD infants showed an increased interest in attention to the trochaic stress pattern, which was also positively correlated with vocabulary comprehension at 12months of age. In contrast, SIBS-A infants attended equally to these stress patterns, although this was unrelated to later vocabulary size.

Recognition memory for foreign language lexical stress

This study investigated whether English speakers retained the lexical stress patterns of newly learned Spanish words. Participants studied spoken Spanish words (e.g., DUcha [shower], ciuDAD [city]; stressed syllables in capital letters) and subsequently performed a recognition task, in which studied words were presented with the same lexical stress pattern (DUcha) or the opposite lexical stress pattern (CIUdad). Participants were able to discriminate same- from opposite-stress words, indicating that lexical stress was encoded and used in the recognition process. Word-form similarity to English also influenced outcomes, with Spanish cognate words and words with trochaic stress (MANgo) being recognized more often and more quickly than Spanish cognate words with iambic stress (soLAR) and noncognates. The results suggest that while segmental and suprasegmental features of the native language influence foreign word recognition, foreign lexical stress patterns are encoded and not discarded in memory.