Learning-Related Plasticity of Gerbil Auditory Cortex: Feature Maps Versus Meaning Maps

The basic functional organization of gerbil auditory cortex was mapped in parallel with unit recording and with the fluoro-2-deoxyglucose mapping (FDG) technique. Among at least seven subfields in this cortex primary auditory cortex (AI) and the anterior auditory cortex (AAF) show prominent tonotopic organization with parallel dorsoventral isofrequency contours (electrophysiology) in correspondence to FDG labeled frequency band laminae. Aversive tone conditioning paradigms produce spacial shifts of FDG tone representation in the tonotopic maps. Response curves of single units are reshaped by tone conditioning to code simultaneously for original characteristic frequency and conditioned frequency. This effect may explain changed FDG tone representation. The results suggest that spectral features as well as meaning of sounds are represented in auditory cortex.

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