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Schematic representation of the summing localization experiment. Pairs of clicks were presented from speakersA and B with an interclick delay of <1000 μsec. In humans, these stimuli are perceived as a single auditory event, originating from a “phantom” source, localized to the side of the leading speaker. In this example, with the click from speaker A leading the click from speakerB, the cat is initially required to fixate an LED to the left to facilitate an overt response.
