Auditory Cortex Lesion and Sound Lateralization: Interaural Time Difference Versus the Interaural Intensity Difference
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Sound localization in the horizontal plane primarily depends on the interaural time difference (ITD) and interaural intensity difference (HD). Single-unit techniques have shown that binaural neurons in the auditory cortex of cats (6, 7) are sensitive to the ITD or IID. If identical sounds with the ITD or IID are presented to both ears through earphones, the sound images are lateralized to the side receiving the earlier, or louder, stimulus within the head. The perceptual effects are therefore termed sound lateralization rather than sound localization. In free-field, these two cues are combined with spectral cues provided by the outer ears to characterize the origin of a sound source.
KeywordsAuditory Cortex Sound Localization Interaural Time Difference Bilateral Lesion Auditory Threshold
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