Abstract
Dichotic listener reception of simultaneous messages was studied as a function of attenuation of the signal level of one of the messages. Listeners, serving in panels, received two messages simultaneously through dichotic headset circuits. The signal level of one message was attenuated in five steps of three decibels each relative to the level of the other message. The simultaneous messages were groupings from the multiple-choice intelligibility tests. Listeners heard the messages under conditions of quiet and noise. The noise was simulated aircraft noise. The general effect upon listener reception of attenuating one of two simultaneous messages was to decrease the reception of the attenuated signal and increase the reception of the unattenuated signal. This effect was more pronounced in noise than in quiet, and yielded linear functions under noise conditions but nonlinear functions in quiet.
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