Language Development

Vocabulary practice flashcards covering key definitions, developmental milestones, theoretical models, and communicative processes in language development from infancy through adolescence.

Phonology

The basic units of sound (phonemes) and the rules for combining those sounds to produce speech in a native language.

Morphology

The rules governing how words are formed from sounds, including proper combinations of phonemes to form meaningful words and the use of grammatical markers such as past tense ($-ed$) and plurals ($-s$).

Semantics

The meanings expressed in words and sentences, where words and bound grammatical morphemes symbolize particular objects, actions, and relations.

Syntax

The rules that specify how words are combined to form meaningful phrases and sentences, demonstrating that sentences with identical words can convey distinct grammatical meanings.

Pragmatics

Knowledge of how language is used to communicate effectively, which involves social editing of speech and adapting messages to the listener's capabilities, knowledge, and social context.

Language Acquisition Device (LAD)

An inborn linguistic processor proposed by Noam Chomsky that is activated by verbal input and contains universal grammar common to all human languages.

Universal Grammar

In nativist theory, an innate biological knowledge of grammatical rules and constraints that are common across all languages.

Usage-Based Theory of Language Development

A constructivist theory formulated by Michael Tomasello proposing that children acquire linguistic competence through cultural learning and general cognitive mechanisms—such as intention reading, joint attention, and pattern finding—without an innate universal grammar.

Child-Directed Speech (Motherese)

A simplified speech register used by caregivers and older siblings that features short, simple sentences that gradually increase in length and complexity as the child's language develops.

Negative Evidence

Subtle communication from parents indicating an error occurred by providing grammatically correct, reformatted, or enriched versions of a child's ungrammatical utterance.

Holophrase

A single-word utterance used by infants and toddlers that represents an entire sentence's worth of meaning.

Naming Explosion (Vocabulary Spurt)

A period between $18$ and $24$ months marked by rapid vocabulary acquisition occurring once children realize that every object and concept possesses a distinct name.

Multimodal Motherese

Exaggerated utterances spoken by an adult that are paired with an accompanying action, which facilitates infant word learning.

Fast-Mapping

The process appearing around $13$ to $15$ months where children rapidly learn and retain the meaning of a novel word after hearing it applied to its referent only a few times.

Overextension

A common early fast-mapping error where a child uses a word to refer to a broader variety of objects or events than is appropriate (such as calling any four-legged animal "kitty").

Underextension

A fast-mapping error where a child restricts a general word to a narrower range of objects than standard usage permits (such as calling only one specific animal-shaped treat a "cookie").

Object Scope Constraint

A cognitive processing constraint where young children assume a novel word refers to an entire object rather than to its subparts or individual attributes.

Mutual Exclusivity

A cognitive constraint whereby children assume that each object has only one label, leading them to avoid assigning a previously learned label to a new entity.

Syntactical Bootstrapping

The cognitive strategy of inferring the meaning of an unfamiliar word from the grammatical structure and syntactic context of the sentence in which it appears.

Telegraphic Speech

Early two-word or multi-word utterances appearing between $18$ and $24$ months consisting primarily of critical content words (nouns, verbs, adjectives) while omitting nonessential articles, prepositions, and inflections.

Semantic Intent

The intended meaning behind a toddler's telegraphic statement, which must be determined by analyzing both the spoken words and the nonverbal situational context.

Grammatical Morphemes

Modifiers such as prefixes, suffixes, prepositions, and auxiliaries that add precise syntactical and semantic meaning to sentences.

Overregularization

The morphological error made by young children of extending regular grammatical rules to irregular words (for example, saying "tooths" instead of "teeth").

Transformational Rules

Syntactic rules used to generate variations of basic declarative sentences into questions, negations, or passive constructions.

Relational Contrasts

Semantic pairs such as big/little, tall/short, and in/on whose correct application depends upon relative contextual comparison rather than absolute meaning.

Illocutionary Intent

The real underlying meaning intended by a speaker, which may differ from the literal semantic meaning of the words spoken.

Semantic Integration

The cognitive process of drawing linguistic inferences across multiple statements to understand more information than was explicitly conveyed.

Metalinguistic Awareness

The conscious ability to reflect upon, analyze, and comment on the structural properties and rules of language.

Referential Communication

The ability to formulate informative descriptions that enable a listener to identify a target object or figure, which improves as children become less egocentric and develop role-taking skills.