8. Are cognitively impaired or learning disabled. Justification: Cognitive impairment and learning disabilities are associated with alterations in brain regions used to accomplish tasks, and, therefore, may introduce significant variably into the data. In addition, cognitive impairment may affect ability to give informed consent. Assessment tool(s): History of known learning disability or cognitive impairment. Vocabulary subtest of the WASI will be given. IQ estimate must be over 85 (corresponding to a vocabulary subtest score > 48). In cases of suspected non-verbal learning disability or mild verbal deficit, a full WASI may be given to obtain a more robust estimate of IQ.