Supporting Thought Development in Pre-operational Children with Intellectual Disabilities

During the pre-operational period (roughly ages 2 to 7), typically developing children make some of the most dramatic cognitive leaps of their lives. According to developmental research published by the NIH, this is the stage when children begin to use mental representations, symbolic thought, and language – the very building blocks of how human beings plan, communicate, and make sense of the world. For children with intellectual disabilities (ID), however, these milestones do not unfold on the same timeline or with the same depth. The impact is not simply a matter of being “slow” – it touches every facet of pre-operational cognition, from how a child plays and draws to how they understand basic concepts like quantity and categories. This post examines those impacts in clear, concrete terms.

What the pre-operational stage normally involves 🔗

Before exploring how ID affects this period, it helps to understand what typically develops during it. As described by Simply Psychology, children during the pre-operational stage begin using symbols – words, images, gestures – to stand for objects and experiences. This symbolic thinking becomes the engine for three major developmental achievements: language, pretend play, and drawing. Children also develop the capacity for mental planning, begin to understand cause and effect, and start grasping that quantities and categories have consistent properties. All of this requires working memory, abstract reasoning, and executive function – areas directly impacted in intellectual disability.

Impact on representational thought and symbolic thinking 🔗

Representational thought – the ability to hold a mental image of something that is not physically present – is a cornerstone of pre-operational cognition. WebMD’s overview of Piaget’s stages notes that during the pre-operational period, children can think about things symbolically and engage in make-believe play because they are able to let one thing stand in for another. In children with intellectual disability, this foundational capacity is significantly affected.

The degree of impact depends directly on the severity of the disability. Children with mild ID typically show delays in symbolic understanding – they can develop it, but more slowly and with greater support. Children with moderate to severe ID show more substantial limitations, while those with profound ID may have minimal or no functional symbolic representation. This is not a peripheral skill – it directly shapes how a child can mentally plan, use language, engage in play, and express themselves through art. All four of these abilities rest on the same cognitive foundation: the capacity to let one thing represent another in the mind.

Consequences for language development 🔗

Language is, at its core, a symbolic system. Every word is a symbol for something else. Because of this, children with ID face real and consistent challenges in language acquisition during the pre-operational years. Common patterns include delayed onset of speech, limited vocabulary growth, difficulties with grammar, and challenges with pragmatic language – the social and contextual use of communication.

The neurological basis of this is well-documented. As explained by LibreTexts, two key brain areas work together to support language: Broca’s area, in the left frontal lobe, handles speech production and grammatical structure, while Wernicke’s area, in the left temporal lobe, is essential for language comprehension. The two communicate through a bundle of nerve fibers called the arcuate fasciculus. Research on language development published in PMC found that myelination in these classic language areas reaches mature appearance by around 18 months – coinciding with the point when children begin actively producing language and grammar. In children with ID, atypical neural development in these areas can disrupt both the comprehension and production pathways, making language development uneven and often significantly delayed.

A PMC review on Wernicke’s area further explains that its development during infancy and childhood is marked by rapid growth shaped by early language exposure and environmental stimuli – which means that cognitive limitations that reduce how a child engages with language-rich environments can compound the biological challenges already present.

Impact on play and drawing abilities 🔗

Pretend play 🔗

Pretend play is one of the clearest windows into a child’s symbolic thinking abilities. When a typically developing child picks up a stick and calls it a sword, they are performing a sophisticated cognitive act – holding two realities simultaneously (the stick and what it represents) while maintaining awareness that it is “just pretend.” This demands symbolic reasoning and executive function.

For children with ID, this type of play is often limited, repetitive, or absent – not because of a lack of interest, but because the underlying cognitive demands are high. Research on play in children with intellectual disabilities found that their play is typically characterised by greater repetitiveness and less variation and innovation than that of typically developing children. Children with ID also tend to prefer structured materials over open-ended ones because they are generally more engaged by the sensory and exploratory aspects of play than the imaginative ones.

A peer-reviewed study published in the Journal of Intellectual Disability Research examining pretend play in children with ID found that while overall symbolic behavior in dyadic play was similar between groups when matched for mental age, children with ID showed lower self-regulatory involvement – meaning they had more difficulty directing and sustaining their own play actions toward a goal. A separate study from ScienceDirect similarly found that peer interaction could support and improve the play structure of children with ID, suggesting that social scaffolding matters significantly in this context.

Drawing 🔗

Drawing is another area where the effects of impaired symbolic thinking become visible. Producing even a simple representational drawing – a house, a person, a tree – requires a child to hold a mental image, plan how to translate it onto paper, coordinate the motor movements needed, and manage the visual-spatial relationship between what they intend and what appears on the page. Each of these steps is more demanding for children with ID. The result is that drawings tend to be less detailed, less representative, and show slower progression from scribbles to recognizable images. This is not a matter of artistic talent; it reflects the compounding challenges of visual-spatial processing, motor coordination, and symbolic representation working together.

Delayed understanding of conservation 🔗

As explained in Lumen Learning’s lifespan development resources, conservation refers to the understanding that quantity does not change simply because appearance does – the classic example being that pouring water from a short wide glass into a tall thin glass does not change the amount of water. Typically developing children usually grasp conservation of number, mass, and volume progressively through the pre-operational and into the concrete operational stage.

For children with ID, the achievement of conservation is significantly delayed, and in some cases may never be fully reached. Three cognitive difficulties converge to create this challenge:

• Centration: Children focus on one visible feature of an object (like height) and cannot simultaneously consider others (like width).
• Irreversibility: They cannot mentally reverse a transformation to understand it returned to its original state.
• Working memory limitations: A study in PubMed on working memory in children with different degrees of ID found deficits across all components of working memory, with those deficits increasing with the severity of the disability. This directly undermines the ability to track and reason about quantities across transformations.

The degree of delay in conservation understanding maps closely to the severity of the intellectual disability. Children with mild ID may eventually develop conservation with appropriate support; those with severe or profound ID are unlikely to acquire it without sustained, highly structured intervention.

Challenges with classification skills 🔗

Classification – sorting objects into groups based on shared features – appears deceptively simple, but it depends on abstract reasoning, working memory, and executive function. According to the NIH’s clinical overview of intellectual disability, intellectual functioning encompasses verbal comprehension, working memory, perceptual reasoning, quantitative reasoning, and abstract thought – all of which are compromised in ID, and all of which are needed for classification tasks.

Children with ID can often learn to sort by obvious visible attributes – colour, shape, size. This is a concrete, perception-based task, and it is achievable with practice. The real difficulty emerges with more abstract classification: grouping objects by function (things you use for eating versus things you use for writing), or understanding hierarchical categories (a dog is an animal, but not all animals are dogs). These require the child to move beyond what is visually apparent and reason about underlying, invisible relationships – precisely the kind of abstract reasoning that ID compromises.

Research on working memory in children with ID published in MedCrave highlights that children with ID perform poorly on working memory tasks compared to typically developing children of similar mental age. Since holding multiple category attributes in mind at once is a working memory-intensive task, this directly limits how far classification skills can develop without targeted support. A meta-analytic review published in Frontiers in Psychology found that working memory training – particularly mixed approaches addressing both verbal and visual-spatial components – can produce meaningful gains in individuals with ID, suggesting this is a productive area for structured intervention.

Severity matters – and so does support 🔗

A key point running through all of these developmental areas is that the extent of impact is not fixed – it is closely tied to the severity of the intellectual disability, and shaped by the quality of early support provided. Children with mild ID often follow a similar developmental trajectory to their peers, but at a slower pace and with greater need for scaffolding. Those with moderate to severe ID will reach fewer milestones independently, while children with profound ID will require highly individualised support for even basic cognitive functioning.

What does not vary is the underlying principle: all of these skills – symbolic thinking, language, pretend play, drawing, conservation, classification – are interconnected. They draw from the same cognitive resources. Strengthening one area, through structured play, language-rich interactions, or targeted cognitive training, can create ripple effects across the others. That is what makes the pre-operational period – despite its challenges for children with ID – a period of genuine developmental potential rather than simply one of limitation.

What do you think? Given that symbolic thinking underlies language, play, drawing, and logical reasoning all at once, how should early childhood educators prioritise support when resources are limited – and does focusing on one area naturally build capacity in the others? Also, considering that working memory plays such a central role across all these developmental challenges, how might memory-friendly classroom practices change the outcomes for children with intellectual disabilities in early education settings?

References

1. https://www.ncbi.nlm.nih.gov/books/NBK537095/
2. https://www.simplypsychology.org/preoperational.html
3. https://www.webmd.com/children/piaget-stages-of-development
4. https://socialsci.libretexts.org/Courses/Pittsburg_State_University/The_Developing_Child/12:_Cognitive_Development_in_Infancy_and_Toddlerhood/12.07:_Language_Development
5. https://pmc.ncbi.nlm.nih.gov/articles/PMC4437268/
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC11491986/
7. https://www.researchgate.net/publication/316287071_5_Play_in_Children_with_Intellectual_Disabilities
8. https://pubmed.ncbi.nlm.nih.gov/21726322/
9. https://www.sciencedirect.com/science/article/pii/S1877042816000495
10. https://courses.lumenlearning.com/suny-lifespandevelopment/chapter/piagets-preoperational-stage-of-cognitive-development/
11. https://pubmed.ncbi.nlm.nih.gov/20433572/
12. https://www.ncbi.nlm.nih.gov/books/NBK332877/
13. https://medcraveonline.com/JPCPY/working-memory-in-children-with-intellectuality-disability-idworking-memory-in-children-with-intellectuality-disability-id.html
14. https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2015.01230/full