Low/High Functioning vs. Severe/Mild Autism

Low/High Functioning vs. Severe/Mild Autism

The problem with labeling someone low/high functioning or severe/mild comes from the fact that a person can be high functioning (verbal, good academic skills, fair to good personal care), but have moderate to severe autism (rigid inflexible thinking, strong sensory issues, poor emotional regulation, delayed processing, and impaired ability to relate with others). Also, a person can be considered low functioning (poor verbal skills, limited academic skills, and minimal personal care skills) but only have mild autism (more flexibility, calmer emotionally, less sensory sensitivities, and more socially connected).

This appears contradictory at first, but when we look closer we see that these labels actually represent two different dimensions. The first, level of functioning dimension, represents the degree of cognitive functioning, or intellectual disability. The second dimension represents the severity of autism symptoms. You could look at these two dimensions as crisscrossing on perpendicular planes, with the dimension of intellectual abilities (high, moderate, low) running vertically and the dimension of autism symptoms (severe, moderate, and mild) running horizontally. The moderate levels of each dimension meeting at the intersection of the two dimensions. Consequently, you can have people who are very high functioning verbally and intellectually, and be moderately to severely impaired in autism symptoms. This can be confusing for many people who initially see the very bright, verbal child, and not initially see the severity of the autism. Or, assume that the nonverbal child is severely autistic. It is not that easy to diagnosis.

Making matters even more complicated, is the variability of verbal skills. Although verbal skills are highly correlated with intelligence, it isn’t always the case. Do not assume that the child who is nonverbal has poor intellectual abilities. There are some children who find it difficult to talk due to auditory processing and motor planning difficulties, not lack of cognitive skills. People often assume that the nonverbal child is severely impaired and place lower expectations on them. The same is also true for the child who is very verbal, but most speech is hidden in scripting and echolalia, and appears to have higher cognitive abilities then he actually may have. So, even for the two basic dimensions (intelligence and autism symptoms), the mixing in of verbal abilities can be deceiving.

The use of labels like high and low functioning, and severely and mildly impaired, are not diagnostic terms, but used more as descriptors when people try and categorize level of impairments. Hopefully the diagnostic criterion in the new DSM will be more descriptive and accurate. Until then, and probably for some time, people will be adding their own descriptive labels to the diagnoses.

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