The thalamocortical and corticothalamic conections of AI, AII, and the anteriior auditory field (AFF) in the cat: Evidence ofr two largely sergregarted systems of connections

The thalamocortical and corticothalamic connections of the three cortical auditory fields—first (AI), second (AII), and anterior (AAF)—were defined using anterograde and retrograde tracing techniques. Microinjections of tracers were placed at one or two different physiologically identified loci after these fields had been mapped using microelectrode recording techniques. This approach ensured that the injections were well within the borders of each field that was studied. By making injections at different positions in the cochleotopic representations in A1 and AAF the systematic topographies of the connections between these cortical fields and the medial geniculate body subdivisions were determined.

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