Research figure: Jean Piaget · Written by Artificial Sapiens
What Piaget's The Construction of Reality in the Child Investigates
Jean Piaget's The Construction of Reality in the Child examines how infants come to organize experience as a world populated by enduring objects, coherent spatial relations, causal connections, and events ordered in time. Its central scientific question is how a child whose earliest intelligence is expressed in perception and action develops practical knowledge of a reality that continues independently of any particular movement or momentary view. Published originally as La construction du réel chez l'enfant in 1937, the monograph analyzes four interdependent achievements: object permanence, spatial organization, causal understanding, and temporal organization. Its claim is developmental and explanatory: coordinated actions gradually produce more stable ways of representing things and relationships. Piaget, 1937, complete original edition; University of Geneva, work history.
The book occupies a distinctive position in Piaget's research. It examines the organization of the infant's world rather than providing a general survey of the four later-famous stages of cognitive development. The six sensorimotor substages form its historical analytic framework, but each chapter asks how one domain of reality becomes organized through coordinated activity. Piaget treats object, space, cause, and time as mutually dependent: the meaning of a hidden object presupposes positions and possible displacements, while an intelligible displacement presupposes a persistent thing whose history can be followed. Piaget, 1937, Introduction; Piaget, 1937, Chapter I.
The enduring contribution of this work is an explicit developmental research program joining epistemological questions to observable infant behavior. Its specific age estimates and some inferences from search failures have been revised by later experiments. Contemporary findings retain the importance of developmental change while distinguishing infants' expectations, their attention to physical events, their memory, and their ability to execute a successful search. That distinction is essential for interpreting both the original monograph and the evidence that followed. Baillargeon, 2004; Keen, 2003.
Publication History, Original Title, and English Translation
The historical work is Jean Piaget's La construction du réel chez l'enfant, first issued in 1937 by Delachaux et Niestlé in Neuchâtel and Paris. The first English-language edition, translated by Margaret Cook, appeared in New York in 1954 from Basic Books under the title The Construction of Reality in the Child. The two dates identify distinct publication events: 1937 belongs to Piaget's original French monograph, while 1954 identifies the widely cited English translation. English citations that use only 1954 can obscure the chronology of Piaget's argument and the historical order of related works. Fondation Jean Piaget, bibliographic record; WorldCat, 1954 English edition; English edition DOI.
The monograph belongs to Piaget's group of early investigations of infancy, especially La naissance de l'intelligence chez l'enfant (1936) and La formation du symbole chez l'enfant (1945). The 1936 book concentrates on the emergence and coordination of practical intelligence; the 1937 book asks how those achievements organize an enduring reality; the 1945 book examines symbolic and representational functions. The trilogy is a historical description of a connected research program, with the years indicating the original French publications. The University of Geneva and Fondation Jean Piaget preserve the corresponding bibliography and original text. Fondation Jean Piaget, book catalog; University of Geneva, online Piaget corpus.
The archival record also clarifies the family setting of the observations. Piaget's analyses of infancy draw heavily on systematic records of his children, assembled in collaboration with his wife Valentine Piaget. Their observational contributions are essential to the provenance of the research even though the monograph's formal bibliographic author is Jean Piaget. His daughters and son appear as research participants in a domestic longitudinal setting, not as a representative random sample of the population. Accurate historical description acknowledges both the scholarly authorship and the collaborative observational labor. University of Geneva, 1937 work history; Fondation Jean Piaget, historical description.
The Architecture of the Original Book
The original text proceeds from an introduction through four major chapters and a concluding synthesis. Chapter I addresses the development of the notion of the object; Chapter II studies the spatial field and the construction of displacement groups; Chapter III examines the development of causality; and Chapter IV traces the temporal field. The conclusion connects assimilation and accommodation, the transition from sensorimotor intelligence to conceptual thought, and the larger construction of an intelligible world. This order is analytical rather than a claim that infants finish acquiring objects before beginning to acquire space, causality, or time. Piaget repeatedly insists on their reciprocal organization. University of Geneva, original table of contents.
The architecture is also epistemological. Piaget asks how an objective world becomes knowable to the developing subject. His use of construction refers to the organization of experience through increasingly coordinated actions and representations. It does not mean that the infant physically creates external objects or that external reality depends on an infant's beliefs. The scientific object of analysis is the changing cognitive organization through which independently existing things become recognizable as enduring, located, connected, and temporally ordered. Piaget, 1937, Introduction; Piaget, 1937, Chapter I.
Chapter I: How the Notion of a Permanent Object Develops
The first chapter asks whether the infant understands a visible thing as a permanent entity that continues to exist after it disappears from sight. Piaget operationalizes this question through coordinated observation and practical search. If an adult hides a toy and the infant does not search, what can be inferred about the infant's conception of that object? If the child searches in the location where the object was previously found rather than where it has just been hidden, what does that error reveal? These concrete behaviors generated a powerful sequence of hypotheses about increasingly coordinated object knowledge. Piaget, 1937, Chapter I.
The first three sensorimotor substages
In the first two substages, Piaget described reflex organization and early habits without systematic attempts to recover fully disappeared objects. In the third, roughly associated with the development of secondary circular reactions, infants sometimes prolong a movement or visually anticipate the reappearance of something recently seen. Piaget interpreted such behavior as an emerging permanence still linked to a particular action or perceptual continuation. Modern research cautions against equating absence of manual retrieval with absence of any expectation about an unseen object: the infant must also control reaching, remember the hiding event, sustain attention, and identify an achievable action. Piaget, 1937, Chapter I; Keen, 2003.
The fourth substage and the A-not-B error
Piaget's influential observation concerns infants who successfully retrieve an object repeatedly hidden at position A, then continue reaching toward A after visibly watching the same object moved to position B. The A-not-B error is a perseverative response to the previously rewarded location. For Piaget, it illustrated an object concept still organized partly around the infant's habitual action: the object had not yet become fully independent of a familiar pattern of retrieval. Crucially, the child may witness the new hiding and still search at the old place. The phenomenon therefore raises questions about the relation between knowledge, intention, memory, and action. Piaget, 1937, Chapter I; Wellman, Cross, and Bartsch, 1987.
A subsequent meta-analysis by Henry Wellman, David Cross, and Karen Bartsch examined the variability of A-not-B findings and the influence of experimental procedure. The literature did not yield a single uniform developmental pattern consistent with a fixed age boundary. Adele Diamond's longitudinal study subsequently tested 25 infants approximately every two weeks, demonstrating that delays between hiding and action affect perseveration; increasing delays made a formerly correct response more difficult. The result linked performance to developing memory-guided action and inhibitory control rather than to the presence or absence of one isolated idea. Wellman, Cross, and Bartsch, 1987; Diamond, 1985.
The fifth and sixth substages: visible and invisible displacement
At the fifth substage, Piaget described more successful tracking of successive visible moves: a hidden object could be sought in the place to which its observed trajectory led. The sixth substage involved the increasingly flexible inference of invisible displacement, such as following the likely location of an object carried beneath a cover or inside a container, even when the precise movement was not directly visible. The distinction goes beyond remembering a location. It concerns the ability to coordinate multiple transformations into a coherent account of one persisting object. These behaviors supplied historical grounds for a transition from directly organized action to internal representation. Piaget, 1937, Chapter I.
The original text describes this developmental progression using approximate ages, tasks, and observations from a very small group of children. These are historically significant analytic distinctions, not contemporary diagnostic thresholds. Individual differences, the timing of visible and invisible displacement tasks, visual attention, and the physical demands of a particular procedure can shift performance. The appropriate scientific conclusion is that object representation and successful object-directed action develop through interrelated processes whose different components can mature at different rates. Diamond, 1985; Keen, 2003.
Chapter II: Space and the Composition of Displacements
Piaget's second chapter concerns spatial organization. For the infant, a sequence of reaching, turning, moving, and looking can initially be tied to separate situations. A more objective spatial system requires integrating multiple routes and transformations: an object occupies positions that can be connected through displacement, the same location can be approached through different actions, and a movement can in principle be reversed. The original French chapter calls this the elaboration of groups of displacements. Its concern is structural: a coherent spatial system must coordinate relations among things instead of indexing every position solely by the infant's current bodily action. Piaget, 1937, Chapter II.
The term group is derived from mathematical thinking about transformations, although an infant is not proposed to possess a formal group-theoretical proof. Piaget uses the concept to describe the coherence of practical displacements: continuity of a route, composition of successive movements, alternative paths between positions, and reversibility. A ball that rolls behind a screen can be represented as occupying a further position in one continuous space. A toy moved from one container to another can remain the same toy, now in a new location. The emergence of these relationships is the original chapter's central explanatory concern. Piaget, 1937, Chapter II.
In early development, bodily and perceptual frames of reference are important: near and far, reachable and unreachable, visible and hidden are initially intertwined with active movement. Piaget's more advanced sensorimotor organization extends spatial relations among objects. The child can follow an object across changes in viewpoint or across successive hiding locations, and can begin to integrate movements into a stable layout. He connects these accomplishments to the same coordination of schemes underlying object permanence, showing why the chapters are conceptually interdependent. Piaget, 1937, Chapter II; Piaget, 1937, Conclusion.
Contemporary work supplies a richer picture of early spatial capacities. Research on core knowledge proposes early-developing systems for objects, actions, number, and space that organize attention before the child can solve all manual problems. This literature challenges the strongest interpretation of Piaget's claim that objective spatial relations must await a late, unified sensorimotor achievement. Yet early sensitivity to a spatial relation does not automatically demonstrate the mature ability to navigate, plan, update positions, or explain transformations verbally. Current evidence thus favors decomposing spatial competence by representational demands and response method. Spelke and Kinzler, 2007; Keen, 2003.
Chapter III: Causality and the Organization of Events
The third chapter investigates how infants connect actions and events into relations of cause and effect. Piaget describes a progression from initially action-centered regularities to causal relationships attributed to external objects and their interactions. In his account, very young infants may associate an effect with the total situation in which their own action occurs; a repeated movement that produces an attractive sound or spectacle can become part of a meaningful action scheme. The later achievement is the ability to connect objects and events independently of one's current bodily intervention. Piaget, 1937, Chapter III.
Piaget called some earlier patterns magico-phenomenistic causality, a historical theoretical label for expectations that do not yet distinguish a child's action from the independent physical chain linking events. Its use is explanatory in the original monograph, not a clinical label or a judgment about a child's irrationality. As means and ends become more clearly separated, infants coordinate sequences in which moving one object affects another. The child begins to treat things as capable of producing effects in their own right. The book's larger argument is that causal organization develops alongside permanent objects in an increasingly objective spatial and temporal order. Piaget, 1937, Chapter III.
There is a philosophical dimension to this argument. Piaget contrasts simple habit-based association, interpretations emphasizing the felt efficacy of one's own action, fixed a priori causal categories, pragmatic trial and error, and a relational construction of causality. He adopts the last approach in the original conclusion of the chapter: causal explanation develops through interaction between the acting subject and organized external events. This passage is a theoretical position in genetic epistemology. Whether infants possess particular causal expectations at a certain age is a separate empirical question requiring independent tests. Piaget, 1937, Chapter III, Section 6.
Modern physical-reasoning studies indicate that young infants may anticipate some constraints of occlusion, solidity, and continuity much earlier than Piaget's practical-search stages suggest. The development is also domain-specific. Hespos and Baillargeon found that infants at 4.5 months used relative height information in an occlusion event but not in a comparable containment event; the latter expectation emerged later in their tests. This difference suggests that physical expectations can be organized by event category rather than appearing simultaneously as one comprehensive causal system. These findings are consistent with graded learning, and they challenge a single universal threshold for all causal competence. Hespos and Baillargeon, 2001; Baillargeon, 2004.
Chapter IV: The Construction of a Temporal Field
The fourth chapter analyzes temporal organization. Piaget distinguishes the duration associated with the infant's own activity, effort, anticipation, and satisfaction from the more developed ordering of events that continue beyond the current action. An infant can feel a sequence in an immediately unfolding activity while still having difficulty integrating distinct episodes into a common history. His developmental question is how lived sequences become organized as relations among external events. Piaget, 1937, Chapter IV.
In Piaget's account, increasing coordination of displacement, permanent objects, and causal sequences makes temporal ordering more objective. Events can be represented as happening before or after other events, including those the infant did not directly cause. At the later sensorimotor levels, remembering an absent thing and reconstructing an unobserved movement depend on relating past states to the present. Temporal order is therefore more than clock time. It is the developing capacity to situate actions and environmental events within one intelligible sequence. Piaget, 1937, Chapter IV.
The historical discussion also avoids identifying practical sequencing with mature quantitative concepts of time. Piaget explicitly connects sensorimotor temporal organization to subsequent developments in representational thinking; the later ability to order complex events, judge duration, and use conventional measures involves further cognitive and social learning. Contemporary interpretations should distinguish memory for order, sensitivity to duration, and verbal or numerical judgments of time instead of treating temporal knowledge as a single unitary skill. The 1937 text provides a theory of their coordination; independent experiments are needed for particular claims about each component. Piaget, 1937, Chapter IV; Piaget, 1937, Conclusion.
Assimilation, Accommodation, and the Construction of Objectivity
The book's concluding synthesis connects its four domains to Piaget's mechanisms of cognitive adaptation. Assimilation refers to interpreting or incorporating events through existing action schemes. Accommodation refers to modifying those schemes in response to the organization and constraints of experience. A child who repeatedly reaches for a toy at the old hiding place illustrates persistence of an established coordination; when new information changes the search, the action scheme is being reorganized. Piaget does not define learning as a simple accumulation of separate impressions. He proposes reciprocal adjustments between the active organism's schemes and the structures disclosed by the environment. Piaget, 1937, Introduction; Piaget, 1937, Conclusion.
Equilibration, a broader term in Piaget's genetic epistemology, describes the organization and reorganization of these relations toward greater coherence. In the 1937 work, the key idea is that permanent objects, displacement systems, causes, and temporal series acquire their significance together. A child does not first learn a list of unconnected factual propositions about a ball. The child gradually organizes what counts as the same ball across appearances, what transformations account for changed locations, what interactions cause its movement, and where the movement belongs in an event sequence. These relationships make the experience of reality more stable and predictable. Piaget, 1937, Conclusion.
Piaget's invocation of construction is closely related to genetic epistemology: an account of how forms of knowledge arise and develop. An epistemological interpretation should be kept distinct from direct empirical measurement. A coherent theory of objectivity does not by itself establish a precise emergence age, a unique mental mechanism, or the universality of six stages. Those are testable claims, and later evidence has altered their status. The book is best understood through this dual contribution: an ambitious theory of cognitive organization and an observational research design whose interpretations can be examined empirically. University of Geneva, original 1937 text; Spelke and Kinzler, 2007.
The Original Research Method and Its Scientific Limits
Piaget's procedure combines longitudinal naturalistic observation with interventions designed to elicit telling behavior: hiding an object, changing its location, arranging successive movements, and observing whether an infant searches or anticipates an outcome. The detailed observational sequences are historically valuable because they show how one child responds differently as actions become organized. The clinical-experimental style permits hypothesis generation and rich descriptions of developmental transitions. It also requires caution in generalizing beyond the observed situations. University of Geneva, 1937 work history; Piaget, 1937, Chapter I.
The central sampling limitation is the intimate, small longitudinal group. The domestic context offers sustained observation, but it also concentrates participants in one social and physical environment. The observer knows the child, interprets unspoken intentions, and may adjust the sequence of trials while developing a theory. This creates opportunities for detailed clinical insight and possible expectation effects. Modern experimental practice seeks independent replication, preregistered or explicitly specified procedures when appropriate, transparent coding, comparison conditions, and samples that support the intended generalization. These criteria are methodological standards applied to the historical work; they do not imply that Piaget claimed his household observations constituted a representative population survey.
A second limitation is measurement. A failed reach for a hidden object is a composite outcome: it depends on the infant's representation, working memory, motor coordination, inhibitory control, motivation, perceptual tracking, delay between hiding and response, and the physical arrangement of the display. Likewise, looking for longer at a surprising event depends on perceptual salience, habituation, novelty, and how an investigator interprets looking behavior. A single dependent measure rarely isolates an abstract concept. For this reason, active retrieval tasks and visual-expectation tasks should be considered jointly, with their different processing demands clearly stated. Diamond, 1985; Keen, 2003.
Modern Experimental Challenges to Piaget's Interpretation
Early object expectations in looking-time experiments
Renée Baillargeon's 1987 experiments used a rotating screen and an occluded box to compare an apparently possible event with one in which the screen appeared to pass through the hidden solid object. Some infants around three and a half to four and a half months looked longer at the physically anomalous event. Such results suggest sensitivity to continued object existence and physical constraints well before infants reliably solve the manual-search problems used by Piaget. The experiments challenged a strong inference from the absence of search to the absence of object-related expectation. They did not establish that every component of adult-like object knowledge is present in the earliest months. Baillargeon, 1987; Baillargeon, 2004.
Looking-time methods create their own inferential problem. Differential looking can support the hypothesis that an event violated an expectation, but the precise knowledge producing that response requires careful control conditions. Perceptual novelty, the sequence of habituation, relative visual complexity, and attention can all affect viewing time. This is why the more robust conclusion concerns early differentiated sensitivity to certain physical events, alongside subsequent learning about distinct physical event categories. It is a weaker and more defensible claim than assuming a fully integrated, explicit, adult-like concept of object permanence from one response. Baillargeon, 2004; Keen, 2003.
A-not-B as a memory-and-action problem
Later research substantially broadened the interpretation of the A-not-B error. Wellman, Cross, and Bartsch's meta-analysis documented variability across the experimental literature. Diamond demonstrated that response delays matter and that children can show a perseverative error under conditions where a shorter delay permits success. Munakata developed a parallel distributed processing model in which memory traces, current activation, and habitual response tendencies jointly generate perseveration. Together, these studies make the task valuable precisely because it joins cognitive representation to action under processing constraints. Wellman, Cross, and Bartsch, 1987; Diamond, 1985; Munakata, 1998.
This interpretation also explains why performance need not change at one sharp biological age. An infant might visually register the new location, yet a delay, competing habitual reach, or inefficient control of the movement can favor the old response. Improved execution could reflect changes in the coordination of attention, memory, and reaching rather than a sudden emergence of object existence as a concept. Piaget's original observation survives as a reproducible question about development; his exclusive theoretical interpretation of that behavior does not survive unchanged. Diamond, 1985; Munakata, 1998.
Event categories, continuity, and solidity
Research after Piaget has differentiated what infants expect of occlusion, containment, covering, support, and other physical relationships. Hespos and Baillargeon found different developmental time courses for reasoning about an object's height in occlusion and containment displays. Baillargeon's later review describes the progressive identification of variables relevant to particular classes of physical events. This work suggests a more finely structured developmental picture than the simultaneous arrival of one all-purpose object concept. Hespos and Baillargeon, 2001; Baillargeon, 2004.
An alternative framework emphasizes core knowledge systems. Spelke and Kinzler argue that humans possess early systems representing objects, actions, numbers, and space, while higher-order flexible concepts develop through combination and subsequent learning. This program differs from a strictly late-emerging account of early object representations, although both recognize substantial postnatal development. The disagreement is partly about the initial structure of cognitive capacities and partly about which behavioral measures justify claims of knowledge. The 1937 monograph remains a useful starting point because it posed the representational questions that such contemporary theories attempt to answer experimentally. Spelke and Kinzler, 2007.
What Remains Supported, Revised, or Contested
The historical fact that Piaget published the monograph in 1937, organized it around four related categories, and based major observations on his own children with Valentine Piaget's assistance is well documented by archival sources. His description of infants' developing search behaviors and their dependence on the organization of actions established influential phenomena for developmental research. Independent studies confirm that successful retrieval of displaced or hidden objects varies with the demands of a task, particularly memory and response control. University of Geneva, 1937 work history; Wellman, Cross, and Bartsch, 1987; Diamond, 1985.
Piaget's claim that infants construct increasingly coordinated representations of physical relations remains influential as a broad developmental insight. His exact sequence of conceptual achievements and the inference that a child lacks enduring object representations whenever manual search fails are substantially revised. Earlier visual expectations and category-specific physical knowledge make the original timetable insufficient as a general description of all infant competence. The strongest modern account is multidimensional: what a child notices, remembers, anticipates, and can physically act upon may show partially different developmental trajectories. Baillargeon, 1987; Hespos and Baillargeon, 2001; Keen, 2003.
Contested questions remain about how early expectations should be represented theoretically: as core object knowledge, emerging learned expectations, distributed traces of experience, or some combination of initial structures and subsequent learning. There is strong evidence of early sensitivity to physical events, and significant evidence that practical action develops under independent memory and motor constraints. Determining the exact architecture linking these findings requires converging measures rather than elevating one task to the status of a universal developmental test. Munakata, 1998; Spelke and Kinzler, 2007; Baillargeon, 2004.
Relationship to Piaget's Other Books and Research Programs
The Construction of Reality in the Child complements The Origins of Intelligence in Children, the English title associated with the 1936 French volume La naissance de l'intelligence chez l'enfant. The 1936 research studies the organization of intelligent action; the 1937 research develops the corresponding organization of the external world through object, space, causality, and time. The two books should be read as consecutive analyses of sensorimotor intelligence, with different central scientific questions. The later 1945 monograph La formation du symbole chez l'enfant extends the inquiry toward imitation, symbolic function, play, and representation. These chronological relationships help place the book without replacing the distinct subject matter of its individual chapters. Fondation Jean Piaget, original works catalog.
The 1937 volume also anticipates later work on concrete reasoning about space, time, and conservation. Its conclusion compares the organization of a practical sensorimotor universe with later representational and operational thought. The comparisons identify a transformation in the means of thinking: a child who can successfully manage physical events in action may still need further development to reason explicitly about their relations. Piaget's later investigations with colleagues such as Bärbel Inhelder and Alina Szemińska belong to distinct joint research programs and must be attributed to their actual coauthors. The 1937 monograph itself remains a Piaget-authored book grounded partly in family collaborative observation. Fondation Jean Piaget, commentary on the 1937 conclusion; University of Geneva, corpus bibliography.
Implications for Infant Development Research and Education
The most direct practical consequence of the monograph is methodological. Observing a child repeatedly, changing one feature of an event at a time, and asking how a particular response depends on what preceded it can reveal developmental processes that a single milestone checklist overlooks. Piaget's book demonstrates why the pathway toward a successful action matters as much as the action itself. Modern studies refine this insight by independently measuring attention, recognition, expectation, delay tolerance, response choice, and manual performance. Diamond, 1985; Keen, 2003.
For caregivers and educators, varied opportunities for safe exploration, watching movement, handling objects, and experiencing predictable consequences can be developmentally meaningful. The 1937 work provides theoretical reasons to take infant action seriously as a source of learning, but it does not establish a proprietary teaching program or prove that a particular exercise accelerates object permanence. Observing an infant's response to a hidden toy is an informal window into behavior, not a medical or developmental diagnostic instrument. Variability across context and task should shape interpretation. Piaget, 1937, Chapter I; Keen, 2003.
The book is also valuable in the history of cognitive science. It joins questions of knowledge and representation to observable behavior at an age before linguistic explanations are possible. It demands an account of how coherent world representations can emerge through interaction with physical events. Modern computational, experimental, and cognitive-developmental approaches differ in their explanations, yet they address several of the same questions Piaget articulated. Its scholarly value lies in that continuing research agenda as well as its precise historical descriptions. Piaget, 1937, original work; Munakata, 1998; Spelke and Kinzler, 2007.
Frequently Asked Questions About the Book
When was The Construction of Reality in the Child first published?
The original French edition, La construction du réel chez l'enfant, appeared in 1937. Margaret Cook translated it into English, and Basic Books published the English-language The Construction of Reality in the Child in 1954. Citations should distinguish the two editions. Fondation Jean Piaget, bibliographic record; WorldCat, English edition.
What are the book's four principal subjects?
Piaget studies the development of the notion of the permanent object, the organization of space and displacements, the development of causality, and the temporal field. He argues that these aspects of a coherent reality develop in mutual relation through sensorimotor activity. University of Geneva, contents.
Is the book mainly about object permanence?
Object permanence is its most widely remembered topic, but it occupies the first of four major chapters. Piaget's wider explanatory purpose concerns how an infant organizes objects, locations, events, causal interactions, and temporal sequences into an intelligible external world. Reducing the text to one hidden-toy task misses its principal structure. Piaget, 1937, original edition.
Did modern research disprove the entire theory?
Modern experiments have revised important age-related and inferential claims, especially the assumption that failure in manual search demonstrates absence of any representation of hidden objects. The broader developmental question of how perceptual expectations, memory, movement, and integrated world knowledge become coordinated remains active. It is scientifically more precise to identify which hypotheses and tasks have been revised than to label the book in its entirety as confirmed or refuted. Baillargeon, 1987; Diamond, 1985; Keen, 2003.
Related Articles
Jean Piaget's Theory of Cognitive Development and Four Stages — The integrated stage framework that gives the book its original developmental context.
Jean Piaget's Object Permanence Research and Its Modern Evaluation — A focused evaluation of hidden-object experiments, A-not-B errors, and modern methodological revisions.
Jean Piaget's Sensorimotor Stage and Infant Cognition — The larger sensorimotor sequence within which Piaget organized his early infant observations.
Jean Piaget's Major Books and Publications: A Chronological Guide — A bibliographic guide distinguishing original French editions, English translations, and coauthored research.
References
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