This paper presents the results of an investigation using a new instrument for the study of brain damage in human subjects. The design of the instrument, the Continuous Performance Test (CPT) was based on certain electroencephalographic evidence which suggested that brain-damaged individuals should show inferior ability as compared with non-brain-damaged individuals on tasks requiring sustained attention or alertness.The waking EEGs of brain-damaged patients generally show either random bursts of hypersynchronous (high amplitude) activity intruding upon the normal activity of the brain, or a general hypersynchrony (3, 8). Hypersynchronous activity is also evident in 1 The authors would like to extend their appreciation to the following individuals and institutions for providing advice and/or subjects and testing facilities for this research: Mr. Samuel Greenhouse of the

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