Prose messages were presented simultaneously and dichotically to a subject who was required to shadow one of them. Five different relative intensities were used. It is shown that once the two messages are of equal intensity there is little further improvement in shadowing performance if the message the subject accepts is made more intense than the message the subject rejects. Even when the accepted message is −5 db with respect to the rejected message there is no significant rise in errors when the number of mistakes is used as the criterion for assessing the subject's accuracy of response.
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