A reduced ability to discriminate social from non-social touch at the circuit level may underlie social avoidance in autism.
Level 5 - mechanism / opinion, no new human data
Bench and animal research using mouse electrophysiology and behavior.
PubMed 40382316 · doi:10.1038/s41467-025-59852-6
What was done
Researchers recorded neural activity in wild-type and Fmr1 knockout mice (a genetic model of autism) using Neuropixels probes targeted to the somatosensory cortex, tail of the striatum, and basolateral amygdala. They analyzed neural firing and behavioral responses during repeated presentations of an inanimate object versus another mouse, examining differences in voluntary choice and proximity via linear modeling.
What was found
The abstract reports no numerical values, exact counts, or effect sizes. Wild-type mice showed behavioral aversion to repeated inanimate object presentations but not to other mice, with cortical neurons tracking touch context and striatal neurons shifting preference based on choice. Fmr1 knockout mice displayed equal aversion to social and non-social stimuli, particularly at close proximity, accompanied by reduced cortical and striatal discrimination of social valence and altered cortical encoding of avoidance behaviors.
Why it matters
This work identifies circuit-level differences in sensory valence encoding within cortical and striatal areas that may contribute to tactile aversion and social avoidance phenotypes in neurodevelopmental models.
Limits
The study is limited to a single rodent model of Fragile X syndrome, which may not capture the full heterogeneity of human autism. The abstract omits sample sizes, neuron counts, effect sizes, and precision metrics, and no direct causal or therapeutic circuit manipulations are reported.
Cited by
- supports Fragile X syndrome model mice exhibit social withdrawal behavior when placed in a cage with other mice.