Dichotic listening is a psychological technique used to study auditory processing and selective attention. In this task, two different auditory messages are presented simultaneously to each ear through headphones. Typically, one message is played in one ear (the "attended" channel), while a different message is played in the other ear (the "unattended" channel). Participants are often instructed to pay attention to and report what they hear in the attended ear while ignoring the message in the unattended ear.
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