Introduction
Anxiety is a common response to stressors experienced throughout life, such as starting a new school, taking examinations or moving house. In some circumstances, anxiety can be helpful as it triggers adrenaline responses which help the brain and body to cope with the stressors. These adrenaline responses help individuals to run from danger, enhance cognitive functioning in an examination or improve motivation to complete a challenging task. Prolonged and frequent anxiety, however, is physically and emotionally damaging as the body needs time to recover and repair after adrenaline releases. A person who has persistent and pervasive anxiety does not have the opportunity to recover and the impact on mental health can be significant.
Anxiety is a prevalent problem for autistic children (White and Roberson-Nay, 2009; Ozsivadjian and Knott, 2011), affecting at least 40% of individuals who have a diagnosis of autism (Van Steensel et al., 2011). The impact of anxiety on school-age children with autism is significant, adversely affecting school attendance, educational attainment, family quality of life and parental stress (Dabrowska and Pisula, 2010; Carter et al., 2013).
Table 1.1 Diagnostic features of autism
| Deficits in social communication and interaction - May not initiate or respond to social interactions
- Lack of reciprocity in conversations
- Unusual eye contact and body language
- Difficulties understanding gestures
- May not adjust behaviour appropriately to context
- Lack of engagement in imaginative play
- Difficulty in forming and maintaining friendships
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| Restricted and repetitive interests and behaviours - Stereotypes or repetitive movements and/or speech
- Insistence on sameness
- Strict adherence to routines
- Anxiety in response to small changes
- Strong attachment to favourite objects
- Extremely fixated and restricted interest on a topic, activity or object
- Hyper-reactivity or hypo-reactivity to sensory input, or an unusual preoccupation with specific sensory input
|
Autism
Autism is characterised by a spectrum of differences categorised in diagnostic criteria as difficulties in social communication, and restricted, repetitive interests and behaviours (American Psychiatric Association (APA), 2013; World Health Organisation (WHO), 2018). The Diagnostic and Statistical Manual (5th edition) (DSM-5) (APA, 2013) provides criteria for a diagnosis of autism and lists examples of how these criteria may be observed. Examples of the criteria are provided in Table 1.1.
The criteria set out in DSM 5 (APA, 2013) and in the International Classification of Diseases (11th edition) (ICD-11) (WHO, 2018) also highlight that for a diagnosis to be confirmed, autistic features must have been present in early development and significantly impact current functioning.
These autistic features can often become predisposing factors for anxiety, placing autistic children at a higher risk of developing anxiety.
Point to remember
Every autistic child will have a unique set of differences and strengths and they will all be affected by their autism in different ways. A flexible approach to their specific needs and skills is therefore essential.
Prevalence of anxiety in autism
Anxiety is cited as one of the main co-existing difficulties for autistic children (Smith Myles, 2003; White and Roberson-Nay, 2009; Kent and Simonoff, 2017) with up to 84% experiencing anxiety at some time (Ozsivadjian and Knott, 2011). The earliest observations of autism, made by Kanner in 1943 and Asperger in 1944, described autistic children presenting with high levels of worry, obsessions and fear of social encounters (Frith, 1991).
A study by Van Steensel et al. (2011) found that approximately 40% of autistic children have been diagnosed with at least one co-existing anxiety disorder, with the following prevalence rates:
- Specific Phobia: 30%
- ObsessiveāCompulsive Disorder: 17%
- Social Anxiety Disorder/Agoraphobia: 17%
- Generalised Anxiety Disorder: 15%
- Separation Anxiety Disorder: 9 %
- Panic Disorder: 2%
The prevalence of anxiety in autism suggests that there is a correlational relationship between them, but causality is still unclear. Kerns and Kendall (2012) suggest that anxiety is both influential to autism and influenced by autism. There are a number of core autistic characteristics which may predispose a child to developing anxiety.
Causes of anxiety in autism
People with autism may be more prone to experiencing anxiety due to biological differences in brain structure and function and due to the core characteristics.
- Social communication differences
Differences in both expressive and receptive language skills can create high levels of confusion and frustration for autistic children. Interpreting non-verbal cues alongside complex language can be overwhelming, while difficulties in communicating fluently and coherently can lead to anxiety in social interactions. This creates a cycle of negative social communicative experiences, which creates anxiety thought patterns which then further confound communication difficulties.
Events and people may be perceived as threatening, which exacerbates the anxiety and can lead to withdrawal and isolation.
Case example
Becky is a 14-year-old girl with high-functioning autism. She has an extensive vocabulary and her teachers report that she is able to express herself coherently when asked questions in class. Becky, however, finds it difficult to interact with her peers at break and lunchtimes. She cannot process information when several people are speaking at once and cannot easily contribute to conversations about music, movies and fashion. She has now become anxious at these times and withdraws to a quiet classroom to sit alone.
- Insistence on sameness
Many autistic children have a strong preference for predictable routines and familiar places and objects. When inevitable disruptions occur, or when introduced to new situations, anxiety often increases. This anxiety can then create an even greater drive for sameness and routine.
- Intolerance of uncertainty
Intolerance of uncertainty is explained as the ātendency to react negatively on an emotional, cognitive, and behavioural level to uncertain situations and eventsā (Buhr and Dugas, 2009, p. 216). People with autism are thought to have a higher degree of intolerance to uncertainty (Neil et al., 2016) and can find uncertain situations, environments or events stressful, which causes negative thinking and can trigger episodes of intense anxiety.
- Sensory processing differences
Negative reactions to sensory input are common in autistic children. Hyper-reactivity, or over-sensitivity, to sensory input is frequently correlated with anxiety. Many noises, smells, lights, touch and movement are received at a greater intensity by the autistic child, which can lead to sensory overload and anxiety. Unpredictable input, such as a car horn or fire alarm, is particularly stressful. Memories of sensory experiences are stored and affect emotional responses to similar input in the future. The memory of a negative sensory experience is stored and will influence responses to sensory experiences in the future.
- Executive dysfunction
Executive functions include planning, focusing and shifting attention, initiating activity, self-regulation and impulse control. Some autistic children have difficulty with executive functions and demonstrate functions including impulsivity, disinhibition and difficulty controlling emotions (Ozonoff et al., 1991; Ozonoff and Jensen, 1999; Leung et al., 2015). It will also affect the ability to organise themselves and their belongings. This can limit success in daily activities, such as getting dressed or catching a bus, which can fuel negative thinking patterns and contribute to anxieties. Difficulties in executive functioning also impact on the ability to select and utilise emotionally regulating strategies in stressful situations.
Point to remember
The key features of autism are dually causes and outcomes of anxiety. Differences in communication, sensory processing, executive functioning and a need for predictability can create feelings of anxiety. The anxiety then exacerbates these core differences.
These key characteristics of autism create a world which is confusing and chaotic for an autistic child, and this is further confounded by difficulties in recognising and communicating when they feel anxious, or knowing how to ask for help. The factors listed above predispose an autistic child to developing anxiety, but then there are certain events which can trigger anxiety at any time.