They have not been : proven effective, as they do not increase accurate responses produced by a person with a disability. For the history of its use, see http://www.geocities.ws/validationluna/html/a_history_of_FC_e.html. Picture Exchange Systems via iPad "apps" have proved useful for some children with neurodevelopmental disorders like Autistic Spectrum Disorder.
Answered 9/1/2014
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