Abstract
The effect of intermittent noise upon attention span was investigated in two experiments. In Exp. 1, 4 levels of noise intensity were used (no noise, 75 db, 85 db, and 100 db). The task was a serial anticipation task in which the relevant stimuli were 4-letter words located in the center of a projected slide. 3-letter words were peripherally located; the peripheral words were not mentioned to Ss. Ss in the 85-db and the 100-db conditions learned fewer of the peripheral words as indicated by a free-recall test than Ss in the no-noise and the 75-db conditions, indicating a narrowing of attention due to the higher noise levels. In Exp. 2, Ss operating under noise (85 db) performed significantly better on the Stroop Color-Word Test than did Ss operating under no noise, again indicating a focusing of attention due to noise-induced arousal. The results are consistent with the proposal of several authors that increasing emotional arousal causes a narrowing of attention.
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