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This study examined concept identification (CI) performance as a function of physiological arousal and physiological activity as a function of task complexity and expectation of success or failure. The development of an unsolvable set constituted stresses used to manipulate arousal. Results showed the following: (1) a positive correlation between CI errors and muscle action potential (MAP), (2) a negative correlation between spontaneous GSRs and MAP, (3) a greater number of spontaneous GSRs in low complexity-solvable set CI as compared with high complexity problems, (4) progressively improving CI performance in low complexity-solvable set problems, (5) increase in MAPs with high complexity-unsolvable set CI. These findings were interpreted as indicating that MAP reflects internal disturbance associated with inability to process information while spontaneous GSRs reflect successful infonnation intake. DESCRIPTORS: Concept identification, GSR, Muscle action potentials. (V. Pishkin) Address requests for reprints to: Dr. Vladimir Pishkin (150 A), Chief Research Psychologist, VA Hospital, 921 N.E. 13th, Oklahoma City, Oklahoma 73104.

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