Electroencephalographic Differences between Resting and Mental Multiplication

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Abstract
The average frequency of 30 sec. of EEG tracing for two states, resting and mental multiplication (thinking), was determined for 20 Ss by counting each visually detectable change in pen deflection regardless of amplitude. (1) Thinking gave higher average activity scores than resting. (2) The difference in average activity between thinking and resting was greatest in the two frontal and left temporal areas and it was significantly different from the differences in the other areas. (3) In the resting state there was a difference between left and right frontal and temporal areas (which increased while thinking) in contrast with a left-right symmetry of the other areas tested. These findings were interpreted as representing characteristic average activity for the areas and condiions tested and were offered as evidence for the differential utilization of brain areas in the given tasks.

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