What is Hyperlexia? 

By Pranali Shah MS, CF SLP

Definition and Characteristics:

Hyperlexia is a term used to describe an intense interest in reading, often demonstrated by young children who can decode words and read at a level well beyond what is considered typical for their age. While hyperlexic children may exhibit advanced word recognition skills, their comprehension and language abilities may not necessarily align with their reading proficiency. This condition is characterized by an early and sometimes obsessive fascination with letters, numbers, and written language.

It’s important to note that hyperlexia is often identified in the context of other developmental disorders, with a notable association with autism spectrum disorder (ASD). However, not all children with hyperlexia have an autism diagnosis.

Types of Hyperlexia:

There are two main types of hyperlexia:

Type 1 (Hyperlexia I): Children with this type typically demonstrate early decoding skills but experience a significant delay in the development of other language-related abilities, such as expressive language, social language, and comprehension.

Type 2 (Hyperlexia II): In this type, children exhibit early decoding skills, but their language abilities, including comprehension, are at or above age-appropriate levels.

Signs and Symptoms:

Early Reading Skills:

Children with hyperlexia demonstrate advanced reading abilities, often reading well before their peers and often self-taught. Although, often times that they are not comprehending what they can decode. 

Language and Social Challenges:

It is common for a child with hyperlexia to have difficulties with expressive language, and challenges in social interactions. They have very high reading skills but can have lower than average receptive language.  

Diagnosis and Assessment:

Diagnostic Criteria:

There is no specific test to diagnose hyperlexia. Hyperlexia is normally diagnosed based on what symptoms and changes a child shows over time. It usually doesn’t occur as a condition on its own- typically listed as a part of autism (according to DSM-5). It can also occur with other behavioral or learning disabilities. If you suspect your child has hyperlexia it is best to provide intervention earlier than later. 

Assessment Process:

Informal assessment of Hyperlexia can include language assessments, cognitive testing, and observations of social behaviors.

Causes and Theories:

The exact causes of hyperlexia are not fully understood, and research suggests that a combination of genetic, neurological, and environmental factors may contribute to its development. Early intervention and tailored educational strategies, including speech and language therapy, can be beneficial in supporting children with hyperlexia in their overall language and cognitive development.


Overall, hyperlexia can present with various different developmental disorders, language delays, or even behavioral delays. It is not certain that your child had Autism Spectrum Disorder if they have hyperlexia. Every child is different and it is imperative to help the child communicate and learn in the way that is beneficial to them. 


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