Anatomical-Behavioral Analyses of Hindbrain Sound Localization Mechanisms
The representation of visual and somesthetic sensory hemifields on the contralateral side of the nervous system is an axiom of neurology. In sharp contrast to these rather strict contralateral representations, however, it is usually held that the representation of space in the central auditory system is bilateral. That is, stimulation of one ear alone, or stimulation by a sound source located in one hemifield, evokes activity on both sides of the brain. The bilaterality of this evoked activity is easily deducible anatomically and clearly demonstrable electrophysiologically (e.g., Held, 1893; Stotler, 1953; Rosenzweig, 1954; and see review by Brugge and Geisler, 1978). Recently, it has also become possible to visualize its distribution by means of the radioactively-labeled 2-deoxyglucose (2-DG) technique for marking neural tissue of high metabolic activity (Sokoloff et al., 1977).
KeywordsSound Source Auditory Cortex Auditory System Inferior Colliculus Sound Field
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