Auditory comprehension of "yes-no" questions by adult aphasics

Two groups of adult aphasics were administered four different types of auditory-verbal "yes-no" questions. One group received questions including egocentric, environmental, pictorial, and relationship items in a consistent order. The second group received the same questions in random order. Support was found for the existence of a hierarchy of difficulty among the types of auditory-verbal "yes-no" questions. There was no significant difference between the two groups' performance even though the consistent presentation group was slightly superior to the random order group on the auditory-verbal "yes-no" questions.