Reliability of self report among non-oriented head-injured adults

Two groups of head injury clients (oriented and non-oriented) and a group of non-disabled participants were compared on response consistency to a MMPI test. Over three testing sessions it was found that the non-oriented head injury group had the most inconsistent responses followed by the oriented head injury group and the control group. Though six of the 21 MMPI profiles from the non-oriented clients were identified as invalid, MMPI validity scales did not effectively detect unreliable responders. Results suggest that caution is needed when using self-report personal assessments with non-oriented head injury clients.