The role of auditory localization in attention and memory span.

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Abstract
Subjects were required to listen to two simultaneous messages and to pick out and answer one of them. Spatially separated loud -speakers assisted performance, as did apparent separation produced by stereophonic techniques either through loudspeakers or headphones. With the equipment used a split headset was inferior to two loudspeakers, but a combination of one headphone and a loudspeaker was not. It was also shown that when short lists of digits were presented to each ear simultaneously all those on one ear were reproduced before any on the other, unless the presentation rate was slow. Part of the advantage of spatial separation appeared therefore to lie in the possibility of perceiving sounds successively rather than simultaneously.

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