In this review, different meanings of the term “auditory plasticity” are defined and some important dimensions of plasticity are discussed. After providing this framework, two studies on the developmental plasticity of cortical frequency maps are presented. The first explores effects of neonatal, partial cochlear deafferentation on the development of cochleotopic or tonotopic maps in auditory cortex. The second deals with the effects of auditory augmentation on tonotopic frequency maps in primary auditory cortex. In this latter study, kittens were reared in an acoustic environment containing a dominant 8kHz signal, and were subsequently found to develop an overrepresentation of the 8-12kHz region of the tonotopic map in primary auditory cortex. A brief discussion of possible mechanisms is given.