5.2 Autism Spectrum Disorder

Autism Spectrum Disorder (ASD)

  • Definition: Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder characterized by impairments in social communication and the exhibition of restricted, repetitive behaviors.

    • This disorder includes a broad range of difficulties in how individuals interact and communicate, as well as their specific interests and activities.

    • The diagnostic criteria for ASD can last a lifetime, but individuals may function independently with appropriate support.

  • Terminology:

    • The term ASD replaces the previous designation of "autistic disorder" found in earlier classifications, separating it from related conditions such as Asperger's Disorder and Childhood Disintegrative Disorder.

    • ASD presents a continuum of disorders, demonstrating various severity levels based on social and communication deficits, alongside interests and behaviors.

    • The transition to the term ASD reflects a more accurate evaluation of communication and social behavior deficits, emphasizing the distinction between neurotypical development and autistic traits.

  • Diagnostic Approach:

    • Diagnosis involves two core domains, with three levels of severity based on support needs:

      1. Social Relationship and Communication Disturbances

      2. Restricted and Repetitive Interests and Behaviors

    • Social Relationships and Communication:

      • Children with ASD may exhibit delays in language use, however, the unique deficits are particularly within social communication aspects, including:

        • Avoidance of eye contact

        • Odd or unusual facial expressions and gestures

        • Difficulty interpreting body language

    • Restricted Interests and Behaviors:

      • Interests appear narrow yet intense with extreme repetition and rigidity in behaviors:

        • Lack of enjoyment in play, sharing, or reciprocity during social interactions

        • Difficulty engaging in imaginative play or imitative patterns prevalent in typical peer interactions

        • Exhibit stereotypical behaviors such as repeated tapping or body twisting

        • May experience echolalia: repetition of sounds or phrases

        • Strong preference for established routines; variations lead to distress.

  • Case Example - Jeong:

    • 6-year-old boy with notable developmental challenges:

      • Did not respond to social engagement; stiffened when picked up.

      • Displayed no interest in playing with peers, showing distress through rocking behavior.

      • Language development was severely delayed and peculiar, exhibiting high-pitched, monotonous babbling without communicative intent.

  • Sensory Sensitivity:

    • Individuals with ASD may have altered sensitivity to stimuli:

      • Hyposensitivity: Little response to pain or temperature, risking injury.

      • Hypersensitivity: Intolerance to noise, light, or smells, affecting everyday experiences.

  • Developmental Trajectory:

    • Some children may initially show typical development before regressing after age 2, losing language, motor skills, and other capabilities.

      • This behavior aligns with what was previously known as Childhood Disintegrative Disorder, now encompassed within ASD.

  • Autistic Savant Syndrome:

    • Characterized by extraordinary capabilities (e.g., advanced numerical skills or artistic talent) often present early in life, showcasing abilities not prevalent in the general ASD population:

      • Examples include music recall by young children.

      • Individuals with savant skills may show average memory beyond their exceptional areas.

Theories and Treatment of Autism Spectrum Disorder

  • Biological Basis and Inheritance:

    • Studies indicate a significant genetic component underlying ASD:

      • Estimated heritability index of 0.98, with multiple genes (over 60 identified) contributing to susceptibility in large sample sizes.

    • Research discusses variations in the brain's Default Mode Network (DMN) correlating to social communication deficits related to ASD.

  • Behavioral Interventions:

    • Applied Behavior Analysis (ABA) is the predominant treatment methodology, aiming to alter behavior through structured reinforcement.

    • Naturalistic Developmental Behavioral Interventions (NDBI) involve shaping behaviors through play and routine developments to enhance functional behaviors.

      • Example: Teachers increase targeted behavior in functional play through role establishment.

    • Token Economies:

      • Child reinforcement linked to tangible rewards; effectiveness requires thoughtful selection of tokens.

  • Peer-Mediated Interventions:

    • Interaction with peers encourages natural social behaviors, allowing for spontaneous activities without adult interruptions.

    • Some peers may use picture exchanges as a communication method.

  • Emerging Technologies:

    • Potential future treatments include the use of virtual and augmented reality to practice social skills in simulated environments.

    • Current studies are limited in participant size and diversity, indicating a need for further research.

  • Family Involvement:

    • Family values are integral in treatment planning and must align with evidence-based interventions for optimal care.

Rett Syndrome

  • Overview:

    • Rett syndrome is a rare genetic neurological disorder that primarily affects girls, developing within the first 18 months of life.

    • Symptoms include repetitive hand movements, loss of spoken language, atypical gait, and reduction in purposeful hand use.

  • Diagnosis and Gene Involvement:

    • Symptoms emerge around 5 years old, with disorganized social interaction noted in the regressive phase.

    • The MeCP2 gene was identified in 1999; mutations influence neuronal function and may guide treatment strategies involving genome editing.

  • Current Therapeutic Approaches:

    • Progress is being made in psychopharmaceutical studies, but none effectively advanced through clinical trials.

    • Rehabilitation techniques appear promising for improving communication, motor skills, and cognitive impairments.

Asperger's Syndrome

  • Historical Context:

    • Asperger's syndrome, although absent in current DSM editions, previously defined high-functioning autism.

  • Characteristics:

    • Individuals often have narrow and intense interests, difficulty with social cues, language subtleties, and may engage in one-sided conversations without recognizing social inappropriateness.

    • Parents might view these children as gifted until challenges arise in social interactions as they grow older.

Real Stories - Greta Thunberg

  • Activism:

    • Greta Thunberg, diagnosed with autism spectrum disorder (Asperger's) and selective mutism, initiated a global climate strike movement at 15 years old, which exemplified her commitment to climate issues.

    • Her unique perspective shaped her effective advocacy, defining her experiences in clear, emphatic terms.

    • Emphasizing black-and-white thinking, she highlighted the urgency surrounding climate change, viewing inaction as unacceptable.

      • Notable public engagements include an Atlantic crossing to speak at a UN conference and participation in widely publicized protests.

  • Public Perception:

    • Thunberg faces substantial public scrutiny yet maintains her dedication; she regards her diagnosis as a "superpower" that enhances her focus and clarity in advocacy.

  • Cognitive Impact:

    • Research indicates deficits in executive functioning and cognitive flexibility within the high-functioning autism community, emphasizing the need for practical support in daily life management and planning tasks.