The Nativist Theory, also known as the Universal Grammar Theory, proposes that humans are born with an innate capacity for language, including a set of universal grammatical principles.

The One-Word Stage, also known as the Holophrastic Stage, is the initial stage of language development where infants produce single words to represent entire thoughts or ideas.

While genetics, environment, and culture are widely recognized factors influencing language development, intelligence is not directly linked to language acquisition.

The Two-Word Stage is the stage of language development where children start producing two-word combinations, often referred to as telegraphic speech due to its omission of grammatical morphemes.

Aphasia is a language disorder resulting from damage to brain areas responsible for language processing, leading to difficulties in understanding and producing spoken language.

The Interactionist Theory, also known as the Social Interactionist Theory, emphasizes the role of social interaction and environmental factors in language acquisition, suggesting that language is learned through interactions with others.

The Multi-Word Stage, also known as the Grammatical Stage, is the stage of language development where children start producing more complex sentences, using grammatical morphemes, and expanding their vocabulary.

While difficulty understanding language, delayed language development, and problems with speech production are characteristics of language disorders, difficulty with reading and writing is typically associated with learning disabilities.

Dyslexia is a language disorder characterized by difficulty understanding and producing written language, including reading, writing, and spelling.

The Cognitive Theory, also known as the Mentalist Theory, emphasizes the role of cognitive processes and mental representations in language acquisition, suggesting that language is learned through cognitive mechanisms.

The Social Interaction Stage is the stage of language development where children start using language for social interaction and communication, expressing their needs, wants, and emotions.

While genetics, environment, and culture are widely recognized factors influencing language development, nutrition is not directly linked to language acquisition.

Apraxia of Speech is a language disorder characterized by difficulty producing speech sounds correctly, leading to speech that is unclear or difficult to understand.

The Behaviorist Theory, also known as the Habit Formation Theory, emphasizes the role of operant conditioning and reinforcement in language acquisition, suggesting that language is learned through imitation and reinforcement.

The Narrative Stage is the stage of language development where children start using language to express their thoughts, feelings, and experiences, often through storytelling and imaginative play.