Language deprivation experiments have been attempted several times through history, isolating infants from the normal use of spoken or signed language in an attempt to discover the fundamental character of human nature or the origin of language.
The American literary scholar Roger Shattuck called this kind of research study "The Forbidden Experiment" due to the exceptional deprivation of ordinary human contact it requires. Although not designed to study language, similar experiments on non-human primates utilising complete social deprivation resulted in psychosis.
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