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…

The developmental trajectory of audiovisual speech perception in Mandarin-speaking children remains understudied. This cross-sectional study in Mandarin-speaking 3- to 4-year-old, 5- to 6-year-old, 7- to 8-year-old children, and adults from Xiamen, China (n = 87, 44 males) investigated this issue using the McGurk paradigm with three levels of…

Although the ability to understand speech in adverse listening conditions is paramount for effective communication across the life span, little is understood about how this critical processing skill develops. This study asks how the dynamics of spoken word recognition (i.e., lexical access and competition) change during soft speech in 8- to…

Previous research has suggested that fluency does not influence memory decisions until ages 7-8. In two experiments (n = 96 and n = 64, respectively), children, aged 4, 6, and 8 years (Experiments 1 and 2), and adults (Experiment 2) studied a list of pictures. Participants completed a recognition test during which each study item was preceded by a…

To understand spoken words, listeners must appropriately interpret co-occurring talker characteristics and speech sound content. This ability was tested in 6- to 14-months-olds by measuring their looking to named food and body part images. In the "new talker" condition (n = 90), pictures were named by an unfamiliar voice; in the…

Although most studies of language learning take place in quiet laboratory settings, everyday language learning occurs under noisy conditions. The current research investigated the effects of background speech on word learning. Both younger (22- to 24-month-olds; n = 40) and older (28- to 30-month-olds; n = 40) toddlers successfully learned novel…

Vowels with extreme articulatory-acoustic properties act as natural referents. Infant perceptual asymmetries point to an underlying bias favoring these referent vowels. However, as language experience is gathered, distributional frequency of speech sounds could modify this initial bias. The perception of the /i/-/e/ contrast was explored in 144…

A crucial part of language development is learning how various social and contextual language-external factors constrain an utterance's meaning. This learning process is poorly understood. Five experiments addressed one hundred thirty-one 3- to 5-year-old children's use of one such socially relevant information source: talker characteristics.…

Speech productions of 40 English- and 40 Japanese-speaking children (aged 2-5) were examined and compared with the speech produced by 20 adult speakers (10 speakers per language). Participants were recorded while repeating words that began with "s" and "sh" sounds. Clear language-specific patterns in adults' speech were found,…

The purpose of this study was to describe the pattern in which English-speaking children acquire intonation. A second goal was to account for emerging intonation from a theoretical perspective. Six groups of 10 children each between the ages of 6 and 23 months participated in individual play sessions with their mothers and an experimenter. Pitch…

Analyzed the acoustic properties of spontaneous speech to 14-month olds by English- and Japanese-speaking mothers in the United States. Found that utterance- and phrase-level acoustic regularities were large enough to be detected without correcting for other influences. These findings suggest that a naive listener could estimate a prosodic…

Variations in the aversiveness of a newborn's distress cry were examined by means of manipulation of features of fundamental frequency, intonation, and spectral complexity, and of information given to subjects about the infant's health status. Findings suggest that the listener's reaction to cry characteristics can be altered by the inducement of…

Parents, and adults inexperienced in child care rated intensities of infants' cries. The groups did not differ in their ratings. The cries of 6-month olds were rated more intense than 1-month olds. Amplitude and noisiness of cry predicted adult judgments of 1-year olds' cries. A measure of amplitude ratio predicted ratings of 6-month olds' cries.…

Conducted spectrum analysis of standard and vociferous cries from infants with Wessel's colic, non-Wessel's colic, and comparison infants. Vociferous cries had longer duration, higher fundamental frequency, and greater percentage of dysphonation than standard cries. After feedings, problematic criers had greater percentage of dysphonation in…

Conclusion drawn is that bilinguals, brought up in a one-person, one-language home environment, reach a stage in semantic development some 2-3 years earlier than their unilingual peers. (Author/CB)