Language acquisition is the process by which humans develop the ability to understand and produce language, moving through predictable stages (cooing, babbling, one-word, telegraphic speech) and shaped by both innate biology and social interaction.
Language acquisition is how humans go from crying newborns to fluent speakers. It covers learning the building blocks of language (phonemes, morphemes, syntax, semantics) and putting them together to actually communicate, verbally and through gestures.
The process follows a remarkably predictable sequence across cultures. Babies start with cooing and babbling, hit the one-word stage around their first birthday, then move to telegraphic speech ("want cookie") around age two. A classic sign that kids aren't just imitating adults is overgeneralization, where they apply grammar rules too broadly and say things like "I goed to the store." Nobody taught them that word. They built it themselves from a rule they figured out, which is exactly why psychologists argue language learning isn't pure imitation. The big theoretical fight here is nature versus nurture. Behaviorists like B.F. Skinner said language is learned through reinforcement and imitation, while nativists argued we're born with an innate capacity for language that just needs exposure during a critical period to switch on.
Language acquisition sits at the intersection of Topic 5.11 (Components of Language and Language Acquisition) and Topics 6.1 and 6.2 (physical and social development in childhood). That overlap is the point. It's a cognition topic that's tested as a development topic, because the stages of language line up with the broader developmental milestones you learn in Unit 6. It's also one of the cleanest examples of the nature-nurture theme that runs through the whole course. Skinner's reinforcement account, Chomsky-style innateness, Piaget's cognitive development, and Vygotsky's social interaction theory all make different predictions about how kids learn to talk, and the exam loves asking you to match the right theorist to the right claim.
Critical Period (Units 5-6)
The critical period hypothesis says there's a window in early childhood when language acquisition happens easily, and after it closes, full fluency may be impossible. Case studies of severely isolated children (like Genie) are the classic evidence, and they raise serious ethical questions since you can't deliberately deprive a child of language to test the idea.
Phonemes and Syntax (Unit 5)
Phonemes are the smallest sound units and syntax is the rule system for word order. Acquisition is basically learning these layers in sequence. Babies babble phonemes first, then stack words into syntax later, which is why telegraphic speech keeps correct word order even with words missing.
B.F. Skinner (Unit 5)
Skinner argued kids learn language through operant conditioning, where parents reinforce correct sounds and words. Overgeneralization errors like "goed" are the standard counterargument, since kids produce words they've never heard reinforced.
Broca's Area and Brain Plasticity (Unit 2)
Broca's area handles speech production, and damage to it causes Broca's aphasia. Young brains are more plastic, which helps explain why children recover language after brain injury better than adults and why the critical period exists at all.
This term shows up almost entirely in multiple-choice questions, usually in one of three flavors. First, theory-matching questions ask which theorist supports a given claim, like "language learning is facilitated by social interactions" (that's Vygotsky's social interactionist view) or how Piaget's cognitive stages connect to language development. Second, stage-ordering questions test whether you know the sequence from babbling to one-word to telegraphic speech, often with ages attached. Third, application questions use the critical period, including its ethical limits, since researchers can't experimentally deprive children of language. Questions may also pull in linguistic relativity, asking how the language you speak shapes cognition. No released FRQ has used this term verbatim, but language acquisition concepts fit naturally into AAQ and EBQ prompts about development and cognition.
Language acquisition is the process itself, the whole journey from babbling to fluent speech. The critical period is a claim about timing, the idea that this process only works fully during an early developmental window. Don't write that the critical period is "how" we learn language. It's about when acquisition can happen, not the mechanism that makes it happen.
Language acquisition follows a universal sequence: cooing, babbling (around 4 months), one-word stage (around 12 months), then telegraphic speech (around 18-24 months).
Overgeneralization errors like "I goed" prove children extract grammar rules rather than just imitating adults, which is the strongest evidence against a purely behaviorist account.
Skinner argued language is learned through reinforcement and imitation, while nativists argue humans have an innate language capacity, making this a classic nature-nurture debate.
The critical period hypothesis says language must be acquired in early childhood for full fluency, supported by case studies of isolated children and by how easily young kids learn second languages.
Vygotsky's social interaction view and Piaget's cognitive development theory both connect language learning to broader childhood development, which is why this term spans Topics 5.11, 6.1, and 6.2.
Telegraphic speech keeps correct syntax (word order) even while dropping words, showing kids learn grammar structure before they have a full vocabulary.
Language acquisition is the process by which humans learn to understand and produce language, moving through predictable stages from babbling to one-word speech to telegraphic speech. On the AP exam it bridges cognition (Topic 5.11) and childhood development (Topics 6.1 and 6.2).
No, and overgeneralization is the proof. Kids say things like "goed" and "foots" that no adult ever modeled, which means they're extracting grammar rules on their own. Imitation and reinforcement (Skinner's view) play a role, but they can't explain the whole process.
Babbling (around 4 months) is meaningless sound experimentation with phonemes, including sounds from languages the baby has never heard. Telegraphic speech (around age 2) is meaningful two-word phrases like "want cookie" that follow correct word order but drop extra words.
It's the hypothesis that language must be learned during a window in early childhood for full fluency to develop. Case studies of children deprived of language early in life, like Genie, support it, but they also raise ethical problems since you can't run a true experiment on language deprivation.
Both, and the exam expects you to know each side. Skinner's behaviorist view says language is shaped by reinforcement (nurture), nativists argue for an innate language capacity (nature), and Vygotsky's view emphasizes social interaction as the engine of learning.