Developmental psychology focuses on how psychological constructs change with age. In cognitive development research, however, the specifics of this emergence is often underspecified. Researchers often provisionally assume linear growth by including chronological age as a predictor in regression models. In this work, we aim to evaluate this…

By 12 months of age, infants exhibit behavioral sensitivity to sound symbolism (e.g. sound-shape correspondences) when they hear universally sound symbolic pseudowords (e.g. "bouba," "kiki"). Here, we investigated whether infant's sensitivity to sound-shape correspondences is affected when they hear language-specific sound…

Infancy is a period of significant change for both the brain and behavior. During the first two years of life, the brain experiences an explosion of synaptic connections and myelination, alongside rapid development in motor, linguistic, and social behavioral abilities. Understanding the relationship between brain development and behavioral…

The association between developmental trajectories of language-related white matter fiber pathways from 6 to 24 months of age and individual differences in language production at 24 months of age was investigated. The splenium of the corpus callosum, a fiber pathway projecting through the posterior hub of the default mode network to occipital…

Infants start learning words, the building blocks of language, at least by 6 months. To do so, they must be able to extract the phonological form of words from running speech. A rich literature has investigated this process, termed word segmentation. We addressed the fundamental question of how infants of different ages segment words from their…

Halberda (2003) demonstrated that 17-month-old infants, but not 14- or 16-month-olds, use a strategy known as mutual exclusivity (ME) to identify the meanings of new words. When 17-month-olds were presented with a novel word in an intermodal preferential looking task, they preferentially fixated a novel object over an object for which they already…

Data on intentional communication by 15 normal children (ages 11-14 months at outset) were collected at three stages (prelinguistic, one-word, multiword) over the course of a year. All displayed acts for regulating behavior, engaging in social interaction, and referencing joint attention at each stage but with changing proportions. (Author/VW)

Three experiments examined the relation between language acquisition and other symbolic abilities in 18- and 26-month-olds. Found that 18-month-olds spontaneously interpreted gestures, like words, as names for object categories. At 26 months, they spontaneously interpreted words as names and novel gestures as names only when given additional…

Some of the findings of a longitudinal study of three infants between their 11th and 22nd months to document development of linguistic expression of the agent concept indicated that first vocalizations were inconsistently associated with nonverbal agentive behaviors and later mature utterances coded agent-action-recipient events. (MC)

Seeks to determine (1) whether 11- and 13-month-old infants directed their eye fixations to the referent of an object word said by the mother, and (2) whether there was a developmental shift in responding to object words at these two ages. Controls were set for response bias, stimulus preference, and maternal cuing. (Author/RH)

This article evaluates the "Frames, then Content" hypothesis for speech acquisition, which sees babbling as a direct result of producing syllabic "frames" by rhythmic mandibular oscillation with little of the "content" seen under mandible-independent control. Analysis of 6,659 utterances of 6 normally developing…

The results obtained by researchers interested in the speech-time relationship indicate that the sequential organization through time of speech sounds necessary for communication requires a universal "grammar" consisting of vowel and consonant sequences and an awareness of the duration experienced in that process, as well as the memory…

Object play and communication development were studied with four infants with cerebral palsy, involving time spent with objects, types of object play, and object selection. As coordinated looking between object and adult emerged, children demonstrated increased interest in objects and sophistication in their play behaviors. (SW)

A case study of the period of repetitive babbling in one Dutch infant is reported. Repetitive babbling is seen as a systematic and continuous process, during which the child is applying certain strategies in order to form concepts concerning the possibilities of his or her articulatory apparatus. Strategies identified are: (1) variation…

Investigated developmental change in symbolic representational ability by examining infants' imitation of vocalizations, words, visible motor actions, and nonvisible motor behaviors at ages 10, 13, 17, and 21 months. Results revealed a pattern of increasing imitation, supporting the view that a domain-independent representational capacity develops…