Autism spectrum disorder (ASD)

Autism spectrum disorder (ASD) refers to a set of developmental and functional characteristics that persistently affect social communication and the presence of restricted, repetitive patterns of behaviour, interests or activities. We speak of a “spectrum” because the intensity, form and impact of these characteristics vary considerably from one person to another.

An autistic person — or a person with ASD — may present a very different profile from another: some need substantial daily support; others build a rich professional, family and social life, while encountering specific difficulties in certain contexts. Current clinical language emphasises this diversity, rather than a single fixed image.

This page aims to offer clear, nuanced educational reference points. It does not allow you to diagnose yourself, nor to diagnose someone close to you. A diagnosis of ASD is made by a doctor, within a multidisciplinary assessment. The clinical psychologist can contribute through clinical listening, developmental history-taking and certain structured tools, without substituting for the medical act.

In current classifications (notably the DSM-5), autism spectrum disorder is organised around two broad domains. The first concerns characteristics of social communication and interaction. The second concerns restricted, repetitive patterns of behaviour, interests or activities. These domains combine in very diverse ways depending on the person and their stage of life.

Social communication and interaction

This may include, for example, difficulties initiating or maintaining reciprocal exchanges, grasping certain implicit conventions, adjusting gaze, gesture or tone to context, or spontaneously sharing interests and emotions. These characteristics do not mean an absence of interest in others: many people with ASD want relationships, but sometimes struggle to understand the unwritten rules.

Spoken language may be fluent, even highly developed, or conversely limited. It is not the volume of speech that defines ASD, but the way social communication is organised in terms of reciprocity, context and shared attention.

Restricted, repetitive patterns of behaviour, interests and activities

This domain encompasses repetitive movements, rituals, a marked need for predictability, highly focused interests, or particular sensory sensitivities. These elements can be sources of pleasure, competence and stability — and, in certain contexts, sources of fatigue or conflict with the environment.

• Characteristics of social communication and reciprocity
• Focused interests, routines or rituals
• Repetitive movements or vocalisations
• Sensory sensitivities (hyper- or hyposensitivity)
• Need for predictability in the face of change

Sensory processing occupies an important place in the experience of many autistic people. Sounds, lights, textures, smells, physical contact, temperature or internal bodily sensations may be perceived more intensely, more diffusely, or conversely more attenuated than for others. These characteristics are not “in the head” in the sense of being imagined: they reflect different sensory processing.

Hypersensitivity to noise in an open-plan office, an aversion to certain food textures, a need for movement to self-regulate, or a search for deep pressure may all be part of the same sensory picture. A person with ASD often learns, alone or with support, strategies to adapt — sometimes at the cost of considerable fatigue.

Recognising the sensory dimension helps to avoid purely behavioural interpretations (“he’s doing it on purpose”, “she’s exaggerating”). Adapting the environment, planning breaks and identifying saturation thresholds are often concrete levers, well before any discussion of a label.

In childhood, questions may emerge early — sometimes from the first years — or later, when social and school demands become more complex. Parents, school or a healthcare professional may notice atypical development of language, symbolic play, shared attention, or an unusual reaction to changes and sensory stimulation.

Not every child who presents relational difficulties, a focused interest or sensory sensitivity has ASD. Other explanations exist: language delay, anxiety disorder, ADHD, learning difficulties, a stressful family context, and so on. This is precisely why a careful, multidisciplinary and contextualised assessment is necessary.

Early support, when indicated, does not aim to “normalise” the child, but to support their development, communication, wellbeing and the adjustment of their environment (family, school, leisure). French recommendations emphasise identification, referral and interventions adapted to individual needs.

Adolescence often intensifies social, school and identity-related challenges. For an autistic person, this period may reveal difficulties that had until then been compensated: fatigue linked to camouflage, isolation, anxiety, bullying, disengagement, or conversely a clearer assertion of their needs and interests.

Some adolescents with ASD then discover communities, passions or ways of learning that suit them better. Others go through a period of significant distress. Those around them may be puzzled by a gap between strong intellectual abilities and relational or sensory suffering that is not readily visible.

Support at this age often combines clinical listening, possible school adjustments, work on self-esteem, and respect for the person’s pace. Diagnosis, when relevant, can offer a framework for understanding — without becoming an imposed identity.

Many adults discover the possibility of ASD late in life, sometimes after years of questioning, burnout, repeated relational difficulties or a diagnosis in a child. The experience of a person with ASD in adulthood is highly variable: stable or intermittent employment, couple life, parenting, isolation, professional success in a specialised field, chronic exhaustion.

French recommendations concerning adults emphasise the importance of careful clinical assessment, developmental history-taking and consideration of functional impact. The aim is not to apply a label, but to better understand a way of functioning and to open pathways for adjustment and care.

A late diagnosis may be experienced as a relief, a reassessment, or a mixture of both. It deserves to be received with caution, without idealisation or dramatisation. Psychological support can help to integrate this information into an already rich personal history.

Historically, clinical descriptions of autism have relied mainly on observations of boys and male adolescents. Yet many women — and more broadly many people socialised to hide their difficulties — present profiles that are less immediately recognisable. We often speak of camouflage or masking: conscious or automatic efforts to imitate social codes, prepare conversations, inhibit self-regulatory movements, or conceal sensory fatigue.

This camouflage may allow apparent integration, at the cost of a high mental and emotional load. It sometimes contributes to late diagnoses, confusion with anxiety, depression, eating disorders or personality difficulties, and invalidation of lived experience (“you don’t look autistic”).

Recognising these mechanisms does not amount to diagnosing. It simply invites clinicians and those around the person not to rely solely on a fluent social appearance, and to explore developmental history, sensory processing, interests and the cost of adaptation.

Current research converges towards a multifactorial origin, largely neurodevelopmental, with a significant genetic contribution and complex interactions across development. There is no single cause, nor any simple environmental factor that “produces” autism on its own.

It is essential to recall what science does not support. Vaccines do not cause autism: this claim has been widely refuted. Similarly, screens or a parenting style do not “cause” ASD. Sensationalist content still circulates; relying on institutional sources (WHO, Inserm, HAS) helps to avoid unjustified blame.

Understanding causes, in the current state of knowledge, mainly helps to shift the perspective: from blame towards support, from searching for a culprit towards adjusting needs and environments.

In France, a diagnosis of ASD is a medical act. It relies on in-depth clinical assessment, developmental history-taking, and often standardised tools and the opinion of several professionals (doctor, psychologist, speech and language therapist, etc.). The Haute Autorité de Santé (HAS) has published recommendations for identification, diagnosis and support, including in adulthood.

The clinical psychologist contributes to this process: they listen, explore the history, may administer certain tools, and participate in understanding the person’s functioning. They do not make the medical diagnosis of ASD alone. This distinction protects the person from a conclusion reached too quickly and clarifies roles.

Before any conclusion, differential diagnoses and possible comorbidities (anxiety, depression, ADHD, learning disorders, etc.) must be considered. An isolated questionnaire completed online is never sufficient.

1. Listening to the request and its impact on daily life
2. Developmental history and gathering of contextual information
3. Multidisciplinary clinical assessment when indicated
4. Medical synthesis and referral towards appropriate support

The ADI-R (Autism Diagnostic Interview – Revised) is a structured clinical interview, most often conducted with a parent or someone close who knew the person in childhood. It explores developmental history, social interactions, communication and certain behaviours.

Within an ASD diagnostic process, the ADI-R can help to clarify the pathway and functioning. It does not “diagnose” on its own. Its value lies in the richness of the developmental history and in structuring information gathering, as part of a broader assessment.

In the practice, when an ASD diagnostic process is being considered, this tool may form part of careful clinical work, in connection with other elements of the file and, where applicable, with the doctor responsible for the diagnosis.

The RAADS-R (Ritvo Autism Asperger Diagnostic Scale – Revised) is a self-report questionnaire intended mainly for adults. It has been the subject of validation work (notably Ritvo et al., 2011) and may serve as a screening tool or aid to clinical questioning.

It does not constitute a diagnosis. A high score does not confirm ASD; a low score does not rule it out. Studies in outpatient settings (notably Dutch research) have highlighted limitations: sensitivity and specificity vary according to population, risk of false positives or false negatives, and the need for clinical interpretation.

Used with caution, the RAADS-R can open a conversation. Used as a verdict, it misleads. Any lasting conclusion requires a complete professional assessment.

The same person may present ASD alongside other associated characteristics or conditions. This does not imply automatic causality: profiles combine in very diverse ways, and each combination calls for careful clinical reading.

Among associations frequently discussed in the literature and clinical practice, we find notably ADHD, certain anxiety disorders, learning disorders, sleep disorders, as well as marked sensory characteristics. These dimensions can amplify fatigue, complicate schooling or work, or temporarily mask other aspects of functioning.

• ADHD — attention, impulsivity, organisation depending on profile
• Anxiety disorders — social anxiety, anticipation, exhaustion
• Learning disorders — reading, writing, maths, language
• Sleep disorders — falling asleep, waking, rhythm
• Sensory characteristics — hypersensitivity, hyposensitivity, overload

Seeking help may be relevant when persistent characteristics of social communication, interests, routines or sensory processing cause distress, exhaustion, school or work difficulties, or family tension. Doubt itself, when it occupies the mind persistently, sometimes deserves to be placed within a clinical framework.

You do not consult to “obtain a label at all costs”, but to better understand a way of functioning and identify what might help. Sometimes assessment points towards ASD; sometimes towards something else; sometimes towards support without an immediate formal diagnosis. Each pathway remains individual.