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Episode 19: AuDHD Is More Than the Sum of Its Parts – Cognitive Differences, Energy Economy & Late Diagnosis

In this episode of the AuDHD Psych Podcast, clinical psychologist Aaron Howearth and co-host Dan explore why AuDHD isn't simply Autism plus ADHD, but a distinct presentation with its own cognitive, emotional, and behavioural fingerprint. Drawing on clinical work, lived experience, and recent research, Aaron traces the diagnostic history back to the DSM-5 (2013) — the first time Autism and ADHD could be formally co-diagnosed — and explains why anyone diagnosed before 2015 may have had half their neurotype missed.

Aaron and Dan dig into the cognitive differences that set AuDHD apart, including a study showing AuDHD young people experience greater difficulties than their autistic or ADHD peers across planning, attention, simultaneous processing, and successive processing. They unpack the energy economy of AuDHD — how the tug-of-war between routine-seeking autistic characteristics and novelty-seeking, impulsive ADHD characteristics drives masking, burnout, anxiety, and depression — and reframe these patterns through a "different, not defective" lens that centres environment, context, and self-knowledge. Throughout, they offer practical, shame-free reflections on self-identification, late diagnosis grief, adaptive functioning, finding affirming clinicians, and the strengths of an AuDHD problem-solving brain.

Key Themes & Takeaways

• AuDHD Is Not Just Additive – AuDHD includes autistic characteristics, ADHD characteristics, and unique features that exist outside either diagnosis on its own.
  
  
• Diagnostic History Matters – Pre-2013 DSM rules blocked co-diagnosis, meaning many adults diagnosed before 2015 likely had half their profile missed.
  
  
• Cognitive Profile Differences – Research suggests AuDHD young people show greater differences across planning, attention, simultaneous and successive processing than autistic-only or ADHD-only peers.
  
  
• Energy Economy & Burnout – Holding routine-seeking and novelty-seeking together costs cognitive and emotional energy, increasing masking, stress, and burnout risk.
  
  
• Anxiety, Depression & Internalising – AuDHDers are more likely to internalise and mask, layering additional anxiety on top of the additive load of both neurotypes.
• Early vs Late Diagnosis – Late identification can bring grief for "what could have been," but also self-forgiveness and the relief of finally understanding your own brain.
  
  
• Adaptive Functioning in Daily Life – From booking holidays to grocery shopping and showering, AuDHD cognitive differences ripple into self-concept, health, and PDA-style avoidance.
  
  
• Strengths of the AuDHD Brain – Systems and detail orientation (Autism) plus associative, tangential thinking (ADHD) creates a powerful problem-solving brain.
  
  
• Self-Advocacy with Clinicians – Ask for assessment of both Autism and ADHD, and check the clinician understands current AuDHD-specific science, masking interactions, and lived experience research.
  
  
• Reframing "In Between" – AuDHDers aren't half-autistic and half-ADHD; they're both and more — a whole buffet of characteristics, not a single dish.
  
  
• Different, Not Defective – Change the environment and expectatio

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Keywords: AuDHD podcast, autism and ADHD, neurodivergent psychologist, neurodiversity affirming, Howearth Psychology, queer psychologist, autism diagnosis, ADHD awareness, lived experience, neurodivergent mental health, clinical psychology podcas