autistic shutdown
mechanism for self-regulation by autistisc people as a response to overstimulation, where the person withdraws into themselves and doesn't react or interact with the outside world until such time as they are regulated again
en-US/ɔˈtɪstɪk ˈʃʌtˌdaʊn/
en-GB/ɔːˈtɪstɪk ˈʃʌtdaʊn/