Abstract: A method for measuring cognitive efficiency uses the following cognitive tests: Simple Reaction Time; Running Memory Continuous Performance Task; Matching to Sample; and Mathematical Processing Task. A device for measuring cognitive efficiency includes a microprocessor having a memory; the aforementioned cognitive tests loaded into the memory; a baseline stored in the memory, means for computing the score on a run of these tests and for storing the score in the memory; the means for computing being operative for comparing the score to the stored baseline; and means for indicating a cognitive change from the baseline. Changes in cognitive efficiency may be measured by comparing the results of the cognitive tests to a baseline.