In one sentence
In women and people assigned female at birth, a cross-sectional comparison found clearer average differences between autism and borderline personality disorder (BPD) than many expect — especially sensory processing versus identity disruption — while still acknowledging real-world overlap.
What the researchers did
Researchers compared 51 autistic women/PAFAB with few or subclinical BPD traits and 51 BPD-diagnosed women/PAFAB who were not autistic. Participants completed self-report questionnaires on emotion, identity, social cognition and camouflaging, sensory processing, sameness preference, and related traits. The design was cross-sectional (one time point), not a treatment trial.
What they found
- BPD-diagnosed participants scored higher on emotional reactivity and dysregulation, identity disruption, difficulty being alone, and rejection sensitivity; identity disruption showed the largest group difference.
- Autistic participants scored higher on sensory processing, social-cognition/behaviour measures, preference for sameness, and repetitive motor behaviour; sensory processing was the largest autism-side difference.
- A combination of social cognition, social camouflaging, identity disruption, impulsivity, and coping with being alone correctly classified about 95% of participants in this sample.
- Authors still note that each group may resemble the other more than the general population does — differentiation is about patterns, not single symptoms.
What this means for families and therapists
- Ask about sensory load and camouflaging when BPD is the working label but autism is suspected — and about identity instability and alone-coping when autism is diagnosed but BPD traits appear.
- Do not self-diagnose from one questionnaire; use findings as prompts for a thorough clinical differential.
- Related context: gender bias in autism diagnosis and camouflaging measurement issues.
Limitations and what we don't know yet
- Women/PAFAB only; small groups; self-selected online sample.
- Groups were selected to minimise dual diagnosis — real clinics often see co-occurrence.
- Self-report only; cross-sectional; not a diagnostic gold-standard study.
This is a plain-language summary of Overlapping And Differentiating Clinical Features of Autism and Borderline Personality Disorder in Women and People Assigned Female at Birth: A Cross-Sectional Study by Barnicot K., Thompson E., Turner S. et al., Autism (2026). Source license: CC-BY-NC. It is not medical advice — talk to a qualified clinician before changing therapy.