title: Letter: The Porch Index of Communicative Ability (PICA): a psychometric problem and its solution.
mesh_terms: D001037:Aphasia / Q000175:diagnosis*; D003142:Communication; D006801:Humans; D009633:Nonverbal Communication; D011581:Psychological Tests; D011594:Psychometrics; D014705:Verbal Behavior; D014956:Writing