Xenoglossy
Xenoglossy is speaking a language one never learned — the strongest possible past-life claim, and accordingly the rarest and the most attacked. Linguists distinguish it from glossolalia, the fluent-sounding nonsense of trance speech, which explains nearly every recorded case. Nearly. A handful of studies (and rather more family stories) involve responsive conversation in the unlearned language. Accounts here are usually one scene long: a fever, a grandmother answering in wartime Hungarian, a recording nobody in the family can explain.
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