Dimensions of neurobehavioural dysfunction: cross-validation using a head-injured sample

Principal-components analysis of 44 items from the Minnesota Multiphasic Personality Inventory (MMPI) identified as neurologically related was conducted on profiles obtained from 196 individuals with head injury. Four principal factors, that accounted for 36.5% of the total variance, were extracted. The first factor was composed of items tapping attention and memory complaints. The second factor consisted of items focusing on somatic complaints. Items primarily tapping behavioural disturbance made up the third factor, and the fourth factor was composed of items reflecting specific somatic or neurological complaints. These findings partially confirmed those obtained in previous research, and further illuminate the need for developing a specific and brief measure to characterize neurobehavioural dysfunction for neurological samples.