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In this paper,I shall review recent anatomical and physiological experiments which demonstrated that the inferior colliculus (IC) is involved in a great diversity of functional roles in the auditory system,and that most of the interesting auditory features might already be extracted from incoming sounds by this midbrain nucleus.Therefore,the inferior colliculus should be considered as the auditory analog of the primary visual cortex,so that the role of the auditory cortex might be to organize these features into auditory objects.In contrast to the role of the superior colliculus within the visual system,the IC is the principal source of input to the auditory thalamus.