Enhanced fear limits behavioral flexibility in Shank2-deficient mice.
Miru Yun, Eunjoon Kim, Min Whan Jung
PMID 36192805WHAT IT FOUND
Male mice with a genetic mutation linked to autism struggled to adapt when rules changed, but only when the punishment was harsh.
Females and males with mild punishments adapted normally. This suggests fear, not a lack of learning ability, blocked their flexibility in this specific animal model.
Key findings
01Adult male mice with the Shank2 mutation required significantly more trials to learn reversed rules when paired with a strong air puff punishment compared to wild-type mice.
02Male mice with the mutation showed normal rule adaptation when the punishment was mild or when only rewards were used, indicating the deficit was triggered by the intensity of the threat.
03Female mice with the mutation did not show the same impairment in rule adaptation or heightened fear responses as males.
STILL TO COME
How it was doneWhat they found
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What it does not show
This study was conducted entirely on mice. No human participants were involved, and findings cannot be directly applied to human therapy. The results were specific to one genetic mutation (Shank2) and one type of learning task. The mechanism linking the mutation to fear was not identified. Female mice were not tested for the mild air puff or reward-only tasks, limiting comparison of sex differences across all conditions.
Declared interests
The study was funded by the Institute for Basic Science. No other conflicts of interest were reported.
The easy way to misread this
Do not interpret these findings as evidence that human patients with autism have a general inability to learn new rules or adapt to change. The impairment in mice was specific to situations involving strong aversive stimuli, and the study does not demonstrate that this mechanism operates the same way in humans.