State the concept of type locus interaction

Some of the major contributions included the concept of type locus interaction, the analysis of quantitative as opposed to qualitative deficits associated with brain dysfunction, the concept of the brain age quotient, and the scheme for levels and types of inference in interpretation of neuropsychological test data. In addition to the published research, Reitan and his collaborators developed a highly sophisticated method of blind clinical interpretation of the Halstead Reitan battery that continues to be taught at workshops conducted by Dr. Reitan and associates