Poor Reading: A Deep Dive
Causes of dysgraphia
Environmental and neurological factors related to dysgraphia
Dysgraphia does not have a single, pinpointed cause; rather, research suggests it arises from a combination of neurological differences and, in some cases, environmental factors. Here’s what is known about potential causes:
Neurological factors
Dysgraphia is fundamentally a brain-based condition. Writing is a complex task that requires coordination of multiple brain regions – those controlling fine motor skills, language processing, working memory, and visual-spatial perception. In individuals with dysgraphia, neuroimaging studies show the brain works less efficiently in some of these areas. For example, children with dysgraphia have been found to have fewer white matter connections (the wiring that helps brain regions communicate) related to writing and language, meaning their brains must work harder to write. Specific neurological underpinnings include:
Working memory and orthographic coding
Many cases of dysgraphia are linked to a problem with orthographic coding in working memory. This is the brain’s ability to remember and mentally visualize letter shapes and sequences, and to recall the motor patterns needed to write them. If this function is weak, a child may know what they want to say and even spell orally, but struggle to remember how to form letters or spell words on paper. Research by the International Dyslexia Association notes that children with dysgraphia often have impaired orthographic working memory, making it hard to store and retrieve written words and letter patterns.
Motor skill and motor planning impairments
Some children with dysgraphia have subtle difficulties with fine motor control or motor planning. They might have trouble with sequential finger movements (like tapping each finger to thumb in order) without looking. This suggests an underlying issue in the brain’s motor circuits. Poor fine motor coordination or timing can cause the painstaking, labored handwriting seen in dysgraphia. Neurologically, this may involve less efficient activation of motor areas and the cerebellum (a brain region important for coordination and automatic movements). Case studies have shown that cerebellar injury can produce dysgraphia-like symptoms, indicating the cerebellum normally helps automate writing movements.
Visual-spatial processing deficits
Some individuals (often labeled as having “spatial dysgraphia”) have normal motor strength but poor visual-spatial perception. Their brains struggle to judge space and position, affecting writing. They may write letters on top of each other, leave uneven spaces, or have lines of text drifting up/down. This subtype suggests an issue in the brain’s parietal lobe or visual processing centers, which interpret spatial relationships. Indeed, injuries to the left parietal lobe in adults can cause acquired dysgraphia, and developmental dysgraphia sometimes reflects mild dysfunction in similar regions.
Language processing differences
In some cases (sometimes called “linguistic dysgraphia”), the root cause lies in language networks. There may be an inefficiency in the “graphomotor loop” – the pathway that takes thoughts and language (phonological memory) and encodes them into written form (orthographic output). A child with this profile might have more trouble with spelling, grammar, and getting ideas onto paper (even if they can form letters okay). Neurologically, this overlaps with dyslexia’s territory. Notably, dysgraphia often co-occurs with dyslexia, but it can occur alone; when it does, the primary issue might be in this language-to-writing conversion process.
Genetic factors
Genetics likely play a role. Dysgraphia and other learning disabilities often run in families, suggesting an inherited component. If a parent had similar writing difficulties, a child is at higher risk. However, genetics are complex – it’s usually not a single “writing gene” but rather a mix of subtle genetic factors affecting brain development. Research is ongoing, but early findings show family members of individuals with learning disabilities can show different brain activation patterns on MRI, hinting at genetic contributions.
Developmental and environmental differences
Being born prematurely or experiencing complications as an infant can affect brain development. Studies note that children who were preemies have higher rates of learning disabilities including dysgraphia. Early developmental delays in fine motor or visual-motor skills can also set the stage for later writing struggles.
Prenatal and birth factors
Similar to other developmental disorders, factors such as prenatal exposure to toxins (e.g. high levels of alcohol, lead, or certain drugs), maternal smoking, or birth trauma/lack of oxygen could potentially contribute to learning disabilities including dysgraphia. These factors can subtly impact the brain areas involved in motor and cognitive development. (For instance, Fetal Alcohol Syndrome is known to cause a range of learning issues including impaired handwriting in some cases.) Most cases of dysgraphia don’t have a clear event like this, but these conditions are considered general risk factors.
Early childhood experiences
Unlike some skills, lack of practice alone is usually not a primary cause of dysgraphia (since dysgraphia is defined by difficulties despite adequate instruction). However, limited exposure to drawing/writing in early years could exacerbate a mild predisposition. Conversely, proper early support can sometimes alleviate later problems. In short, environment can help or hinder but doesn’t outright cause true dysgraphia.
Co-occurring conditions
Sometimes what looks like dysgraphia is partly caused by another condition. For example, ADHD is common alongside dysgraphia, and attention difficulties can worsen writing by making the child inattentive to detail or impatient with slow tasks. In fact, having ADHD may raise the risk of dysgraphia because attention and focus are required for writing sequences of letters. Autism Spectrum Disorder or Developmental Coordination Disorder (DCD) can also involve poor handwriting. These conditions share some neurological features with dysgraphia, and a child can have both, compounding the writing issues.
Summary
The exact cause of developmental dysgraphia remains somewhat elusive – it’s often a mix of brain-based factors that interfere with writing development. Unlike acquired dysgraphia (which can be traced to a specific brain injury or stroke in adulthood), developmental dysgraphia usually doesn’t have a single event as a cause. Instead, a “perfect storm” of genetics, subtle brain differences, and developmental factors lead to the child’s difficulty with writing. Knowing these causes helps professionals target the right skills during intervention (for example, if orthographic memory is the issue, therapy will focus on that). It also reassures parents that dysgraphia is not caused by poor parenting or teaching – it’s a real neurological issue that the child needs support to manage.
Next up: The visual connection
How visual skills shape writing
Dysgraphia isn’t just about handwriting—it’s also about how your child processes what they see. Our next article explores how visual processing issues can affect writing.