ISKANDAR
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![Sensory overwhelm in autism isn’t a behavior problem — it’s a wiring difference. 🧠 Here’s what’s actually happening in the brain: 🔹 The thalamus (your brain’s sensory filter) shows too much connection to sensory cortices but too little connection to prefrontal regulatory regions — so sensory input floods in without the top-down filtering that usually calms it. This pattern shows up as early as 6 weeks old [4,5]. 🔹 It’s not that the initial reaction is bigger — it’s that the amygdala and sensory cortex fail to habituate. The brain doesn’t “get used to it” the way typical brains do [6,7]. 🔹 Brain-wide scans of ~1,800 people show the same story: sensory networks are underconnected, default mode/subcortical networks are overconnected, and the whole system is less flexible — it gets “stuck” instead of adapting [8,9]. 🔹 Zoom in further and you find an excitation/inhibition imbalance at the microcircuit level, tied to genes active in the thalamus and cortex during development [10]. What this means clinically: reduce simultaneous multi-sensory input, build prefrontal regulation skills, and treat sensory overresponsivity as neurologically distinct from anxiety — even though they share some circuitry [11]. This is a connectivity difference, not a discipline issue. Understanding the “why” changes how we support the people living with it. 💙 Full references below 👇 Follow for more evidence-based breakdowns of the neuroscience behind what we see clinically — and share this with someone who needs the reframe. 🔁 #AutismAwareness #NeuroscienceExplained #SensoryProcessing #AutismSpectrumDisorder #PsychiatryEducation References: 1. Baran B, et al. Increased Resting-State Thalamocortical Functional Connectivity in Children and Young Adults With ASD. Autism Research. 2023;16(2):271-279. 2. Cerliani L, et al. Increased Functional Connectivity Between Subcortical and Cortical Resting-State Networks in ASD. JAMA Psychiatry. 2015;72(8):767-77. 3. Nair A, et al. Regional Specificity of Aberrant Thalamocortical Connectivity in Autism. Human Brain Mapping. 2015;36(11):4497-511. 4. Wagner L, et al. Associations Between Thalamocortical Functional Connectivity and Sensory Over-Responsivity in Infants at High Likelihood for ASD. Cerebral Cortex. 2023;33(12):8075-8086. 5. Nair A, et al. Altered Thalamocortical Connectivity in 6-Week-Old Infants at High Familial Risk for ASD. Cerebral Cortex. 2021;31(9):4191-4205. 6. Green SA, et al. Neurobiology of Sensory Overresponsivity in Youth With ASD. JAMA Psychiatry. 2015;72(8):778-86. 7. Green SA, et al. Distinct Patterns of Neural Habituation and Generalization in Children and Adolescents With Autism With Low and High Sensory Overresponsivity. Am J Psychiatry. 2019;176(12):1010-1020. 8. Ilioska I, et al. Connectome-Wide Mega-Analysis Reveals Robust Patterns of Atypical Functional Connectivity in Autism. Biological Psychiatry. 2023;94(1):29-39. 9. Fu Z, et al. Transient Increased Thalamic-Sensory Connectivity and Decreased Whole-Brain Dynamism in Autism. NeuroImage. 2019;190:191-204. 10. Park BY, et al. Differences in Subcortico-Cortical Interactions Identified From Connectome and Microcircuit Models in Autism. Nature Communications. 2021;12(1):2225. 11. Cummings KK, et al. Shared and Distinct Biological Mechanisms for Anxiety and Sensory Over-Responsivity in Youth With Autism Versus Anxiety Disorders. J Neurosci Res. 2024;102(1):e25250.](/video/cover/7668083382273854734.webp)
