Abstract
Physiological responses of 48 subjects were studied during both a warning and a nonwarning condition and during anagram problem solving. The warning condition was associated with heart rate deceleration and increased occurrence of galvanic skin responses (GSR), of skin conductance, and of tonic galvanic skin potentials (GSP). The warning condition also resulted in significantly faster solution rates. Problem solving was associated with increases in heart rate, occurrence of GSR, and skin conductance. The occurrence of phasic GSP habituated, but the occurrence of tonic GSP maintained a significant response frequency. Large increases in tonic GSP, with minimal phasic increases during problem solving, reflected the bidimensionality of electrodermal activity as a function of the task. These findings were interpreted to support Lacey's hypothesis of response fractionation and suggest the utility of physiological measures in the study of putative attentional functioning.
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