The Neuromicrobiology of Autism
SensorySensory sensitivities (light, sound and touch) can be overwhelming.Busy environments lead to sensory overload.Differences in processing facial expressions and tone of voice are due to the unique connections in brain regions like the amygdala (emotion processing).Helps explain why autistic people may respond differently in social situations
Neural WiringAutistic individuals have unique brain wiring in terms of how different regions communicate with each other. Stronger connections in nearby areas but weaker connections between distant regions (Taddei et al., 2024) → leads to focusing on smaller details rather than combining lots of information at once, like a neurotypical brain. This makes social communication and understanding facial expressions more difficult, as they require multiple brain regions working together.This wiring can also explain strengths like intense focus or attention to detail, as certain areas of the brain are more highly connected and active.Reduced synaptic pruning → Autisic brains keep more unused neural connections than neurotypical ones.This makes it difficult to filter out unnecessary information, resulting in the sensory input feeling more intense and overloaded (sensory overload).
Gut MicrobiomeThe gut and brain are connected through the gut-brain axis.Autistic individuals often have lower levels of beneficial microbes and less diversity overall (Jones et al., 2022 & Darwesh et al., 2024) → affecting the brain through immune responses and production of chemicals that influence neurotransmitters.E.g. metabolites produced in the gut can impact behaviour and even brain development.
Elodie Nevitt- Neuromicrobiology Autism CC
Elodie Nevitt
Created on April 22, 2026
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Transcript
The Neuromicrobiology of Autism
SensorySensory sensitivities (light, sound and touch) can be overwhelming.Busy environments lead to sensory overload.Differences in processing facial expressions and tone of voice are due to the unique connections in brain regions like the amygdala (emotion processing).Helps explain why autistic people may respond differently in social situations
Neural WiringAutistic individuals have unique brain wiring in terms of how different regions communicate with each other. Stronger connections in nearby areas but weaker connections between distant regions (Taddei et al., 2024) → leads to focusing on smaller details rather than combining lots of information at once, like a neurotypical brain. This makes social communication and understanding facial expressions more difficult, as they require multiple brain regions working together.This wiring can also explain strengths like intense focus or attention to detail, as certain areas of the brain are more highly connected and active.Reduced synaptic pruning → Autisic brains keep more unused neural connections than neurotypical ones.This makes it difficult to filter out unnecessary information, resulting in the sensory input feeling more intense and overloaded (sensory overload).
Gut MicrobiomeThe gut and brain are connected through the gut-brain axis.Autistic individuals often have lower levels of beneficial microbes and less diversity overall (Jones et al., 2022 & Darwesh et al., 2024) → affecting the brain through immune responses and production of chemicals that influence neurotransmitters.E.g. metabolites produced in the gut can impact behaviour and even brain development.