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Intellectual Disability

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Intellectual Disability

What is considered an intellectual disability? How can we determine if someone has a disability?

There are many factors to be considered in such an important subject. Let's take a look at the differences in behaviors and symptoms.

  • What is an intellectual disability?
  • What are symptoms of intellectual disabilities?
  • What are types of intellectual disabilities?

Intellectual Disability Definition

Intellectual disability is used in reference to a person who has limitations or conditions, for whom certain functions are found to be more difficult in comparison to someone without those limitations. Intellectual disabilities are often diagnosed in childhood, as most of the symptoms can be identified in the developmental stages of learning to walk or talk. The Diagnostic and Statistical Manual of Mental Disorders 5 (DSM-5) defines someone who has below-average abilities in social and practical ideas as having an intellectual disability (2013).

It is not only a child's difficulty with learning to walk or talk that can categorize them as having an intellectual disability. There are symptoms to identify before a diagnosis can be made.

Intellectual Disability Symptoms

Symptoms of intellectual disabilities can manifest in several ways. The National Down Syndrome Society (NDSS) mentions that behaviors such as trouble with remembering, talking much later in age, problems understanding social rules, or consequences of actions can be early signals that there may be an intellectual disability present. As these children grow, actions such as planning, reasoning, and judgment can be difficult areas to learn and comprehend (NDSS.org, 2022). As the child ages, the symptoms or behavior is described as having trouble with taking care of one's self.

These symptoms alone are not the sole way of diagnosing an intellectual disability. So what else is used? Intelligence testing or IQ testing is implemented in diagnosing intellectual disabilities.

Intellectual Disability Test

IQ testing is important to solidify suspicions of intellectual disabilities, so as not to rely solely on behavioral observations. The IQ level is also very important and shows the severity of intellectual disability in categories like borderline, mild, moderate, severe, and profound (Myers' Psychology for AP, 2012). Those with intellectual disabilities are said to have an IQ below 70, in addition to being unable to meet the basic requirements of taking care of themselves. Myers also states that only 1 percent of Americans meet these criteria; of that group, 50 percent are males (2012). These IQ levels can dictate or correspond to a person's abilities both in life and education. The chart below includes the levels of IQ that are associated with life adaptations.

Clinical Term IQ LevelEducation PossibleLife Adaptation Possible
Borderline70-84
Mild50-70Special education is helpful at this level. 6th-grade level education possible in late teens. May need help in stressful situations. Self-supporting vocationally and socially.
Moderate35-50Special education is necessary at this level. 2nd to 4th-grade education by late teens.Semi-independent. Can work in an easier environment.
Severe20-35Limited speech and toilet habits.Learns simple tasks but will need total supervision.
ProfoundBelow 20Unresponsive. Little to no speech. No toilet training.Requires total care and supervision.

(Myers' Psychology for AP, 2012)

IQ testing is incredibly important to the diagnosis of an intellectual disability and goes hand-in-hand with displayed symptoms and behaviors. Once the IQ testing is finished and combined with the observed behaviors, there is a question to be answered.

What type of intellectual disability is being observed?

Types of Intellectual Disabilities

Certain disorders such as attention deficit hyperactivity disorder (ADHD) are often assumed to be intellectual disabilities. This is incorrect. There are blurred lines between what a learning disability is and neurodevelopmental disorders. For example, those with intellectual disabilities may also have autism spectrum disorder (ASD) in a comorbid state.

How is autism different from an intellectual disability? Those with ASD can learn new information and can lead lives with supervision. One of the differences in this example is that those with ASD often find it difficult to read emotions and feelings from individuals. Attention deficit disorder is also different in that there is the ability to learn new information, but often there are behaviors such as the subject being very talkative or easily distracted, which leads to problematic labeling and treatment.

Examples of Intellectual Disabilities

The disorders below are actual examples of intellectual disabilities.

22q11.2 Deletion Syndrome (22q11.2.DS)

22q11.2 deletion syndrome (22q11.2 DS) is considered an intellectual disability. It does not have much public awareness compared to other disabilities. A Comprehensive Guide to Intellectual and Developmental Disabilities (Wehmeyer, 2017) explains that this disability manifests in significant intellectual impairment and delays in development, and is a result of a small deletion of DNA on chromosome 22.

Fetal Alcohol Spectrum Disorder (FASD)

Fetal alcohol spectrum disorder (FASD) is one of the most common reasons for the diagnosis of intellectual disabilities. Children who are diagnosed with FASD are known to have many issues including delayed speech and language acquisition and cognition (Wehmeyer, 2017). Children develop FASD when their mother heavily drinks when pregnant.

Fragile X Syndrome (FXS)

Fragile X syndrome (FXS) is the most commonly known inherited type of intellectual disability. This gene mutation affects the x chromosome and is more prevalent in males as compared to females. Children who have this diagnosis have learning delays, hyperactivity, sensitivity to touch and sound, and aggressive outbursts (Wehmeyer, 2017).

Intellectual Disability - Key takeaways

  • Intellectual disability refers to a person who has limitations or conditions for which certain functions are found to be more difficult in comparison to someone without those limitations.
  • The Diagnostic and Statistical Manual of Mental Disorders 5 (DSM-5) defines someone who has below-average abilities in social and practical ideas as having an intellectual disability (2013).
  • Behaviors such as trouble with remembering, talking much later in age, problems understanding social rules, or consequences of actions can be early signals.
  • IQ testing is important to solidify suspicions of intellectual disabilities and those with intellectual disabilities are said to have an IQ below 70.
  • There are three common types of intellectual disabilities: Fetal alcohol spectrum disorder (FASD), 22q11.2 deletion syndrome (22q11.2 DS), and Fragile X syndrome (FXS).
    • Children who have FASD are known to have many issues including delayed speech and language acquisition and cognition.
    • 22q11.2 deletion syndrome (22q11.2 DS) shows up as significant intellectual disability and delays in development and showcases a small deletion of DNA on chromosome 22.
    • Fragile X syndrome (FXS) is the most commonly known inherited type of intellectual disability.

Frequently Asked Questions about Intellectual Disability

Intellectual disability refers to a person who has limitations or conditions for which certain functions are found to be more difficult in comparison to someone without.

Early childhood.

No, because those with AD can learn new information and can lead lives with supervision. One of the differences in this example is that those with AD often find it difficult to read emotions and feelings from individuals.

No, it is not. Those with ADHD can still learn new information, but it can be a comorbid diagnosis.

Fetal alcohol spectrum disorder (FASD), 22q11.2 deletion syndrome (22q11.2 DS), and Fragile X syndrome (FXS).

Final Intellectual Disability Quiz

Question

When is an intellectual disability most often diagnosed?

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Answer

In early childhood.

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What are early signs or symptoms that a child may have an intellectual disability?

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Answer

Difficulty remembering

Late speech development

Problems understanding social rules or consequences of actions 

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Question

What test(s) are used in order to help diagnose an intellectual disability?

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Answer

IQ tests are administered 

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Question

What is the IQ level with "borderline" intellectual disability levels?

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Answer

IQ level 70-84

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What is the IQ level with "Mild" intellectual disability levels?

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Answer

IQ level 50-70

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What is the IQ level with "moderate" intellectual disability levels?

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Answer

IQ level 35-50

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What is the IQ level with "severe" intellectual disability levels?


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Answer

IQ level 20-35

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What is the IQ level with "profound" intellectual disability levels?


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Answer

IQ level below 20

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Are intellectual disabilities more prevalent in males or females?


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Answer

Males 

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ADHD is considered an intellectual disability. True or false?

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Answer

False. It is, however, often a comorbid diagnosis to an intellectual disability.

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Autism is considered an intellectual disability. True or false?

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Answer

False. It is, however, often a comorbid diagnosis to an intellectual disability.

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What is the most commonly known inherited form of intellectual disability?


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Answer

Fragile X Syndrome (FXS)

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What are the three most common forms of intellectual disability?

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Answer

Fetal alcohol spectrum disorder (FASD). 

22q11.2 deletion syndrome (22q11.2 DS). 

Fragile X syndrome (FXS).

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Question

In older children, what are common symptoms that may identify an intellectual disability?


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Answer

Difficulties with planning, reasoning, and judgement. 

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Question


An example of an intellectual disability is:

A. Attention deficit hyperactivity disorder (ADHD)

B. Fetal Alcohol Spectrum Disorder (FASD)

C. Dyslexia 

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Answer

B. Fetal Alcohol Spectrum Disorder (FASD)

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What stage of development do intellectual disability symptoms present themselves?

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Answer

Learning to walk and talk

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What is not an early sign or symptom of an intellectual disability?

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Answer

Difficulty remembering parents

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What two things are typically used by clinicians to make a diagnosis?

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Answer

IQ test and behavioral observations

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Question

True or false? 


Someone with mild intellectual disabilities cannot live fully independently. 

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Answer

False

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Around what level of education is someone with a mild intellectual disability able to receive by their late teenage years?

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Answer

4th grade

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Around what level of independence can someone with a moderate intellectual disability get?

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Answer

Full independence

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Can someone with an intellectual disability also have autism?

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Yes

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Question

How is 22q11.2 Deletion Syndrome an intellectual disability?

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Answer

There is missing DNA on chromosome 22 which causes intellectual impairment and developmental delays

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Why is fetal alcohol spectrum disorder an intellectual disability?

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Answer

People with fetal alcohol spectrum disorder have delayed speech and language acquisition and cognition

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Why does someone develop fetal alcohol spectrum disorder?

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Answer

Their mother drinks during pregnancy

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Why is fragile x syndrome an intellectual disability?

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Answer

Among other symptoms, people with fragile x have learning delays

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How does someone develop fragile x syndrome?

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Answer

They inherit a gene mutation on their x chromosome 

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How does the DSM-5 describe someone with an intellectual disability? 

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Answer

Someone with below-average abilities in social and practical ideas

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Question

Which is the most commonly known inherited intellectual disability?

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Answer

Fragile x syndrome

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Question

What is not impacted when someone has an intellectual disability?

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Answer

Reasoning

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