How Do Children Develop Language and Thought?

From new words and rules to concepts, causal exploration, and flexible action: explaining change in childhood.

Level: Introductory
Reading load: 10 core readings in 6 units
Prerequisites: No course in child development or linguistics is required. The guides introduce the key terms. How Do Infants Build Knowledge and Skills? offers useful background on early abilities; How Do We Develop Across the Lifespan? supplies the broader developmental framework.
Last reviewed: September 2026

Introduction

A child learns more than a growing store of facts. A familiar word ending is carried to an invented animal, a category suggests an unseen property, and a number word acquires a new meaning. Sometimes the child can explain a rule before acting upon it. Such changes ask us to study how children understand a problem, choose a strategy, interpret other people, and put knowledge to use.

This path begins with how to explain change within a child. It then connects learning word meanings with generalizing language patterns, using categories with constructing new concepts, and causal exploration with learning from teaching. A review and a methods paper examine how children come to guide their attention and actions by a rule. The final framework brings the organization of family and community activity into view: what children are learning depends partly on what they are invited and able to do.

The aim is to compare explanations without turning an age difference into its own explanation. By the end, you should be able to distinguish a child’s observed response from the knowledge or process inferred, propose a comparison that separates competing accounts, and consider how language, instruction, and participation shape a developmental opportunity. Two longer experimental articles provide detailed cases; the shorter conceptual papers supply questions to bring to them.

Unit 1 of 6

How can we explain change in children’s thinking?

Start with the process to be explained. A child can use several approaches before one becomes more frequent or effective. Observing those changes provides a different kind of evidence from comparing average performance at two ages.

Reading
1 of 10
Children’s Learning
Siegler, R. S. (2005). Children’s learning. American Psychologist, 60(8), 769–778. https://doi.org/10.1037/0003-066X.60.8.769
Major synthesis · Methodological contribution · Moderate · Full work: 10 pages
Establish the distinction between describing a developmental difference and observing how it arises. Keep strategy variability, rate, and transfer available as questions for the language and reasoning studies that follow.
A question to consider. If older children give more correct answers, what repeated observations would show whether they acquired a new approach or improved an existing one?

Unit 2 of 6

How do children learn meanings and generalize language?

Learning what a speaker means and extending a pattern to a new word are different achievements. A theoretical account of communicative interpretation introduces one problem; an experimental method makes productive linguistic knowledge visible. Both require attention to the experience and context supporting the response.

Reading
2 of 10
The Social-Pragmatic Theory of Word Learning
Tomasello, M. (2000). The social-pragmatic theory of word learning. Pragmatics, 10(4), 401–413. https://doi.org/10.1075/prag.10.4.01tom
Foundational argument · Major synthesis · Moderate · Full work: 13 pages
Examine the proposed role of understanding another person’s communicative goal. Use Siegler’s distinction between a learning outcome and a process account to ask what the examples establish about the mechanism.
A question to consider. What comparison would distinguish learning from shared communicative context from merely associating a word with the most noticeable object?
Reading
3 of 10
The Child’s Learning of English Morphology
Berko, J. (1958). The child’s learning of English morphology. WORD, 14(2–3), 150–177. https://doi.org/10.1080/00437956.1958.11659661
Landmark empirical study · Methodological contribution · Moderate · Full work: 28 pages
Move from interpreting a word to extending a linguistic pattern. Compare what a novel-word response reveals with what Tomasello’s word-learning examples reveal; neither task provides a complete account of language acquisition.
A question to consider. How would you use unfamiliar words with different sound patterns to investigate the scope of a child’s generalization rather than simply record a correct answer?

Unit 3 of 6

How do categories support inference—and how can concepts change?

Language can guide an inference about a familiar category and can also contribute to the construction of a new conceptual resource. Distinguish using knowledge from explaining its origins. The category experiments and the number-learning argument address different parts of that problem.

Reading
4 of 10
Categories and Induction in Young Children
Gelman, S. A., & Markman, E. M. (1986). Categories and induction in young children. Cognition, 23(3), 183–209. https://doi.org/10.1016/0010-0277(86)90034-X
Landmark empirical study · Moderate · Full work: 27 pages
Examine how a supplied category label changes the information children use. Connect the task to the previous unit’s generalization question while separating inference within a category from learning how to form it.
A question to consider. Why would using a supplied label to predict an animal’s unseen property be insufficient to explain how the child learned the category?
Reading
5 of 10
Bootstrapping & the Origin of Concepts
Carey, S. (2004). Bootstrapping & the origin of concepts. Daedalus, 133(1), 59–68. https://doi.org/10.1162/001152604772746701
Foundational argument · Challenging · Full work: 10 pages
Ask what must change for a child to represent something in a new way. Compare Carey’s proposed starting resources and learning mechanism with Siegler’s account of changing strategies, and keep familiar category use distinct from conceptual construction.
A question to consider. What would distinguish learning more number facts within an existing system from acquiring a new understanding of what the count list represents?

Unit 4 of 6

How do children decide what to explore?

Children encounter evidence through both their own actions and other people’s demonstrations. These experiments ask how uncertainty and the apparent purpose of a demonstration affect exploration. The issue is what information an arrangement makes available, not a universal choice between teaching and discovery.

Reading
6 of 10
Serious Fun: Preschoolers Engage in More Exploratory Play When Evidence Is Confounded
Schulz, L. E., & Bonawitz, E. B. (2007). Serious fun: Preschoolers engage in more exploratory play when evidence is confounded. Developmental Psychology, 43(4), 1045–1050. https://doi.org/10.1037/0012-1649.43.4.1045
Landmark empirical study · Accessible · Full work: 6 pages
Use the controlled demonstrations to connect the structure of evidence with exploratory action. Apply the earlier distinction between an observed response and an inferred mental process to the claim that play can be informative.
A question to consider. Which action would separate two possible causes, and what further measure would show whether the child learned from performing it?
Reading
7 of 10
The Double-Edged Sword of Pedagogy: Instruction Limits Spontaneous Exploration and Discovery
Bonawitz, E., Shafto, P., Gweon, H., Goodman, N. D., Spelke, E., & Schulz, L. (2011). The double-edged sword of pedagogy: Instruction limits spontaneous exploration and discovery. Cognition, 120(3), 322–330. https://doi.org/10.1016/j.cognition.2010.10.001
Landmark empirical study · Methodological contribution · Moderate · Full work: 9 pages
Compare uncertainty after confounded evidence with the expectations created by an apparently knowledgeable teacher. Ask how the meaning of a demonstration can change exploration even when the demonstrated action is similar.
A question to consider. How could a demonstration help a child master a specific function while narrowing discovery of other functions, and which learning goal would matter when evaluating that tradeoff?

Unit 5 of 6

How does knowing a rule become flexible action?

Knowing and doing can diverge. A review introduces deliberate regulation under different motivational demands; a protocol then shows how one part of that broad construct is measured. Trace the steps from theoretical term to procedure to score.

Reading
8 of 10
Hot and Cool Executive Function in Childhood and Adolescence: Development and Plasticity
Zelazo, P. D., & Carlson, S. M. (2012). Hot and cool executive function in childhood and adolescence: Development and plasticity. Child Development Perspectives, 6(4), 354–360. https://doi.org/10.1111/j.1750-8606.2012.00246.x
Major synthesis · Moderate · Full work: 7 pages
Introduce developmental regulation without treating a child’s behavior as a fixed capacity. Compare the review’s age patterns, neural proposals, and training evidence with the earlier distinctions among descriptions, mechanisms, and learning.
A question to consider. A practiced game improves after training. What evidence would justify claiming a change in flexible behavior beyond that game?
Reading
9 of 10
The Dimensional Change Card Sort (DCCS): A Method of Assessing Executive Function in Children
Zelazo, P. D. (2006). The Dimensional Change Card Sort (DCCS): A method of assessing executive function in children. Nature Protocols, 1(1), 297–301. https://doi.org/10.1038/nprot.2006.46
Methodological contribution · Accessible · Full work: 5 pages
Inspect a concrete measure behind a broad developmental claim. Use the rule reminders, switching demand, and scoring criteria to ask what a failure reveals and what alternatives remain.
A question to consider. If a child states the rule correctly but sorts incorrectly, which task modification would help decide whether the difficulty concerns maintaining, selecting, or applying the rule?

Unit 6 of 6

How do communities organize opportunities to learn?

Return to social context with a broader unit of analysis: the activity in which a child participates. The framework asks who may observe, contribute, direct, and evaluate. Use it to reconsider the opportunities assumed by the earlier word-learning, exploration, and regulation tasks.

Reading
10 of 10
Learning by Observing and Pitching In to Family and Community Endeavors: An Orientation
Rogoff, B. (2014). Learning by observing and pitching in to family and community endeavors: An orientation. Human Development, 57(2–3), 69–81. https://doi.org/10.1159/000356757
Foundational argument · Major synthesis · Moderate · Full work: 13 pages
Bring the path’s individual tasks into relation with everyday participation. Compare explicit demonstration with observation and contribution to shared work, while keeping the framework’s cultural claims open to variation and evidence.
A question to consider. Choose an earlier study and propose a change in its participation structure—who acts, observes, or helps. What would you measure to distinguish a change in opportunity from a difference in underlying ability?

Scope and omissions

This path concentrates on the toddler, preschool, and primary-school years, with language meaning and morphology, categories and number concepts, causal exploration, and flexible regulation as its central examples. The executive-function review extends into adolescence where useful for comparison. Cultural and educational experience enter as parts of the developmental process, not as a final explanation for unexplained differences.

It is not a survey of every linguistic system, a complete theory of grammar, or a course in literacy, bilingual development, mathematical education, or clinical assessment. Attachment, peer relationships, moral development, and the fuller development of understanding other minds need their own treatment. The selected experiments draw heavily on restricted samples and particular languages or tasks. A cultural framework broadens the questions without making those samples representative or establishing a universal sequence.

Synthesis

Children's language and thought grow through the meeting of existing knowledge with new patterns, intentions, strategies, and activities. A better answer may signal a new concept, a more effective strategy, a changed interpretation, or greater command of knowledge already present. The readings help us separate these possibilities. Developmental explanation becomes more precise when improvement is the question to be explained rather than its own explanation.

Choose one example and describe five things: the response observed; the knowledge or process inferred; the comparison that supports that inference; the proposed route of change; and the opportunity to learn supplied by the setting. Then propose a second task or a longitudinal observation that could challenge your account. Consider whether the measure would mean the same thing across language backgrounds, ages, and participation arrangements.

A strong explanation must connect what happens within an encounter to change across encounters and time. It must also account for variation: generalization can be partial, knowledge can outstrip action, and learning opportunities can differ without implying a simple ranking of children or communities.

Continue with How Do Relationships and Social Understanding Develop? to examine caregiving, self-awareness, emotion regulation, understanding other minds, friendship, moral judgment, and peer influence.

For a complementary account of observation, imitation, teaching, and source evaluation, continue with How Do We Learn From Other People?. For the organization and use of language beyond its acquisition, follow How Do We Understand and Use Language?.