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This webinar presents a neurodiversity-affirming and integrative framework for the assessment and treatment of Complex Post-Traumatic Stress Disorder and dissociation in Autistic and ADHD individuals. Autistic and ADHD people experience disproportionately high rates of chronic relational trauma, sensory overload, invalidation, bullying, medical harm, and systemic exclusion across the lifespan. These experiences significantly increase vulnerability to Complex PTSD and dissociative responses, yet are frequently misdiagnosed, minimised, or misunderstood within traditional mental health frameworks. This session will explore how trauma and dissociation present differently in autistic and ADHD clients, including responses such as masking, fragmentation, sensory-based dysregulation, and identity-based distress.
Participants will be guided through affirming adaptations to trauma assessment, including history taking, dissociation screening, sensory profiling, attachment formulation, and risk assessment that prioritise safety, consent, predictability, and autonomy. An integrative treatment model will be discussed, drawing on EMDR, Schema Therapy, parts-based approaches, somatic and sensory regulation, and relational interventions, with attention to pacing, interoception, communication differences, and accessibility.
Key clinical tensions will be addressed, including diagnostic overshadowing, therapist bias, internalised ableism, and the risks of inadvertent re-traumatisation through misattuned interventions. This webinar supports clinicians toward genuinely identity-safe, trauma-informed, and neurodiversity-affirming practice.
Liam Spicer (he/him) is a Senior Lecturer in Psychology, Psychologist, EMDR Trainer & Consultant, and Accredited ISST Schema Therapist with lived experience of being neurodivergent as an Autistic ADHDer. He is the course co-ordinator for Cairnmillars Postgraduate Certificate in Trauma Informed Care, and delivers EMDR level one training for Psychology Training.
Liam has presented at both International and National conferences including in Europe, the United States, and Asia on the topics of EMDR, Schema Therapy, trauma, grief, Autism and ADHD and has delivered guest webinars and trainings for the EMDR Association of Australia, AAPi, Headspace, APS, and other organisations.
Liam has been a contributor to the Routledge International Handbook of Child and Adolescent Grief, has published in various academic journals including their paper with colleagues on Understanding Early Maladaptive Schemas in Autistic and ADHD individuals which has gained widespread international interest, and is currently apart of Australia’s first working group on developing clinical practice guidelines on MDMA-AP for PTSD. He is recipient of the 2026 International Society for Schema Therapy Research Grant, for a project on Unmet Core Needs, Adverse Childhood Experiences, Schemas and Schema Modes in Autistic and ADHD Adults.
As a psychologist, he has a special interest in working with trauma, dissociation and grief, and predominantly works with Autistic and ADHD adults through a neuroaffirming lens. He is the director of the Neurodiversity Affirming Therapy Conference Australia and is currently involved in several academic and research projects in this space.
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