 A.R.Luria published his well-known book "The Working Brain" in 1973 as a concise adjunct volume to his previous 1962 book "Higher Cortical Functions in Man".In this volume, Luria summarized his three-part global theory of the working brain as being composed of three constantly co-active processes which he described as the; (1) Attention system, (2) Mnestic (memory) system, and (3) Cortical activation system.