1. A method for distinguishing between short-term and long-term learning in a human subject to thereby improve the efficiency of learning in the said human subject, comprising: pre-determining a threshold value of potential for comparison with the individual's evoked potential representative of the brain wave pattern of a human subject, presenting educational material as a stimulus for learning by the subject, sensing the amplitude of the brain wave potential evoked from the subject by said learning stimulus, comparing the sensed brain wave amplitude with the said pre-determined threshold potential, activating an indicator when the said evoked potential value exceeds the pre-determined threshold potential as an indication of the duration in which long-term learning is occurring.