The Autism Experience


Autism Spectrum Disorder

Autism Spectrum Disorder

What is Autism Spectrum Disorder (ASD)?

Autism Spectrum Disorder (ASD), hereafter referred to as Autism (which includes Asperger’s Disorder and Pervasive Developmental Disorder – Not Otherwise Specified [PDD-NOS]), is a complex, lifelong developmental condition that typically appears during early childhood and can impact a person’s social skills, communication, relationships, and self-regulation. The Autism experience is different for everyone. It is defined by a certain set of behaviors and is often referred to as a “spectrum condition” that affects people differently and to varying degrees.

While there is currently no known single cause of Autism, early diagnosis helps a person receive resources that can support the choices and opportunities needed to live fully.

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Screening & Diagnosis

Autism is characterized in the American Psychiatric Association’s Diagnostic and Statistical Manual (DSM-5), which is used by clinicians to diagnose Autism by: Persistent differences in communication, interpersonal relationships, and social interaction across different environments. What this can look like:

  • Being nonverbal, nonspeaking, or having atypical speech patterns, having trouble understanding nonverbal communication, difficulty making and keeping friends, difficulty maintaining typical back-and-forth conversational style.

Restricted and repetitive behavior, patterns, activities and interests. What this can look like:

  • Repeating sounds or phrases (echolalia), repetitive movements, preference for sameness and difficulty with transition or routine, rigid or highly restricted and intense interests, extreme sensitivity to, or significantly lower sensitivity to, sensory stimuli.


Autism is prevalent across the world, although tracking rates can vary due to differences in reporting. In 2023, the Centers for Disease Control and Prevention (CDC) issued its Autism prevalence report.

  • The report concluded that the prevalence of Autism had risen to 1 in every 36 – more than three times as great as the 2004 rate of 1 in 125.
  • Children who receive an Autism diagnosis by age 4, are fifty times more likely to receive services.
  • The 2023 report noted that more White and Black children were identified with Autism than Hispanic children.
  • Previous studies have shown, that children of color may still receive their diagnoses later than White children. Stigma, lack of access to healthcare services due to non-citizenship or low income, and non-English primary language are potential barriers to the early identification of Hispanic children and children of color with Autism.
  • Currently, boys are also approximately 4 times more likely to have an Autism diagnosis than girls of the same age. However, recent research suggests that girls may not display characteristics of Autism in the same way as boys and might go undiagnosed because of their different presentation.

The DSM-5

The DSM-5 is used by clinicians to diagnose Autism and the features of Autism are described in this document. The DSM-5 criteria require that the core features of Autism be present in early childhood. However, for some children, the symptoms may not fully manifest until social demands exceed the person’s capacity to cope with them. In addition, challenges may be masked by learned coping strategies and support.

To learn more about receiving an Autism diagnosis, visit our Screening & Diagnosis page.

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Signs & Characteristics

Autism impacts an individual throughout the lifespan. However, research shows that early diagnosis can lead to improved quality of life. The behaviors of Autism may be apparent in infancy, but they usually become clearer during early childhood. As part of a regular health visit, your child’s doctor should perform developmental screenings focused on Autism. This screening is recommended at ages 18 and 24 months for all children.

Your doctor will encourage you to ask specific questions about your child’s developmental progress. The National Institute of Child Health and Human Development (NICHD) developed a detailed list of behaviors, listed in four categories: communication, social behavior, stereotyped behavior, and other behavior. Additionally, the Centers for Disease Control and Prevention (CDC) developed a list of Signs and Symptoms, which can be found here.

Social Behavior

  • Prefers solitary or parallel play rather than engaging in associative or cooperative play with other children
  • Preference for predictable, structured play over spontaneous or make-believe play
  • May not respond to name being called
  • Struggles to make eye contact to communicate interests and/or needs


  • Develops speech later than typical or not at all (nonspeaking)
  • Repetition in language or movement, such as repeating the same word or sounds, hand flapping, or any repeated movement
  • Atypical nonverbal communication, including avoiding eye contact, giving few facial expressions, or having a monotone voice

Stereotyped Behavior

  • Extremely distressed by changes, including new foods or changes in schedule or routine
  • Strong, persistent interest in a specific topic, part of a toy, or item

Other Behavior

  • These characteristics vary widely and do not necessarily mean your child has Autism. However, if your child is showing these behaviors, a screening is encouraged. Many families start by voicing their concerns with their child’s primary physician, with referrals being made to a specialist for further evaluation. For more information, visit our Screening & Diagnosis page

Causes & Factors

There is no known single cause for Autism, but it is generally accepted that it is caused by differences in brain structure or function. Brain scans show differences in the shape and structure of the brain in people with Autism compared to in neurotypical development. Researchers do not know the exact cause of Autism but are investigating a number of theories, including the links among heredity, genetics, and medical problems. There has been misinformation about the cause of Autism. It is not caused by vaccines or due to parenting style or nutrition.

In many families, there appears to be a pattern of Autism or related disabilities, further supporting the theory that the disorder has a genetic basis.

While no one gene has been identified as causing Autism, researchers are searching for irregular segments of genetic code that people with Autism may have inherited. It also appears that some people are born with a susceptibility to Autism, but researchers have not yet identified a single “trigger” that causes Autism to develop.

Other researchers are investigating the possibility that under certain conditions, a cluster of unstable genes may affect brain development in an unexpected way, resulting in Autism. Still other researchers are investigating complications during pregnancy or delivery as well as environmental factors such as viral infections, metabolic imbalances, and exposure to chemicals.

Genetic Vulnerability

Autism tends to occur more frequently than expected among individuals who have certain medical conditions, including fragile X syndrome (FXS), tuberous sclerosis, congenital rubella syndrome (CRS), and untreated phenylketonuria (PKU). Some harmful substances ingested during pregnancy also have been associated with an increased likelihood of Autism.