Purpose: The purpose of the present study was to explore the ability of Hebrew-speaking children with childhood apraxia of speech (CAS) to produce lexical stress. Method: A total of 36 children aged between 4 and 7 years, 18 children with CAS, and 18 typically developing (TD) children participated in the study. All children completed language and…

Purpose: This study examined how speakers adapt to fundamental frequency (f[subscript o]) errors that affect the use of prosody to convey linguistic meaning, whether f[subscript o] adaptation in that context relates to adaptation in linguistically neutral sustained vowels, and whether cue trading is reflected in responses in the prosodic cues of…

This study examines the effects of task complexity on second language (L2) pronunciation accuracy and global pronunciation measures in pronunciation-unfocused tasks and assesses the relationship between acoustic and listener-based pronunciation measures. Eighty-two Catalan/Spanish learners of English performed simple and complex versions of a…

The purpose of this dissertation is to examine the perception of unstressed vowel reduction (UVR)--also known as vowel devoicing--in Central Mexican Spanish. UVR is a variable, gradient process in which vowels undergo a constellation of phonetic weakening processes including shortening, devoicing, and apparent deletion (Gordon 1998). While it is…

This study compared the acoustic properties of 26 (100% female, 100% monolingual) Danish caregivers' spontaneous speech addressed to their 11- to 24-month-old infants (infant-directed speech, IDS) and an adult experimenter (adult-directed speech, ADS). The data were collected between 2016 and 2018 in Aarhus, Denmark. Prosodic properties of Danish…

In this study we asked whether nonwords created by transposing two phonemes (/biks[open-mid back rounded vowel]t/) are perceived as being more similar to their base words (/bisk[open-mid back rounded vowel]t/) than nonwords created by substituting two phonemes (/bipf[open-mid back rounded vowel]t/). Using the short-term phonological priming and a…

There is a long-standing debate in the literature about the benefits that acoustic components of Infant Directed Speech (IDS) might have for infants' language acquisition. One of the highly contested features is vowel space expansion, which refers to the enlargement of the acoustic space between the corner vowels /i, u, a/ in IDS compared to Adult…

Purpose: The objective of this study was to determine if and how the subcortical neural representation of pitch cues in listeners with normal hearing is affected by systematic manipulation of vocoder parameters. Method: This study assessed the effects of temporal envelope cutoff frequency (50 and 500 Hz), number of channels (1-32), and carrier…

This paper explored and analyzed features of English pronunciation that could cause intelligibility problems for Nepali English learners (ELs), who use English as a foreign language (EFL) or English as a second language (ESL). We examined the Nepali ELs' pronunciation issues by juxtaposing them with comparable segmental and suprasegmental features…

Purpose: The purpose of this study was to evaluate the effects of nonmodal phonation on estimates of subglottal pressure (Ps) derived from the magnitude of a neck-surface accelerometer (ACC) signal and to confirm previous findings regarding the impact of vowel contexts and pitch levels in a larger cohort of participants. Method: Twenty-six vocally…

Most orthographies contain both accented and non-accented vowels. But are they processed as variants of the same letter unit or as separate abstract units? Recent research in French has revealed that accented vowels seem to be processed as separate units. Here we examined whether this phenomenon is universal or language-specific. We chose Spanish…

Purpose: Smoothed cepstral peak prominence (CPPS) and harmonics-to-noise ratio (HNR) are acoustic measures related to the periodicity, harmonicity, and noise components of an acoustic signal. To date, there is little evidence about the advantages of CPPS over HNR in voice diagnostics. Recent studies indicate that voice fundamental frequency (F0)…

Infant-directed speech (IDS) is phonetically distinct from adult-directed speech (ADS): It is typically considered to have special prosody--like higher pitch and slower speaking rates--as well as unique speech sound properties, for example, more breathy, hyperarticulated, and/or variable consonant and vowel articulation. These phonetic features…

Previous research on infant-directed speech (IDS) and its role in infants' language development has largely focused on mothers, with fathers being investigated scarcely. Here we examine the acoustics of IDS as compared to adult-directed speech (ADS) in Norwegian mothers and fathers to 8-month-old infants, and whether these relate to direct…

An often overlooked but fundamental issue for any comprehensive model of visual-word recognition is the representation of diacritical vowels: Do diacritical and nondiacritical vowels share their abstract letter representations? Recent research suggests that the answer is "yes" in languages where diacritics indicate suprasegmental…