The Porch Index of Communicative Ability (PICA) uses the same 10 test stimuli in each of its 18 subtests. Users score responses with a 16-category, binary-choice scoring system. The PICA provides several procedures for charting patients’ performance and predicting recovery. The Boston Diagnostic Aphasia Examination (BDAE) contains 27 subtests in its standard form, which takes from 1 to 5 hours to administer. A 21-subtest short form takes about 1 hour to administer. The BDAE permits users to assign patients to classic neurodiagnostic aphasia syndromes and to measure patients’ performance across a large number of tasks.• The Western Aphasia Battery (WAB) resembles the BDAE but is shorter and psychometrically more sophisticated. Those who use the WAB may classify patients into classic aphasia syndromes with a taxonomic procedure.
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