Cover Picture: Subdivisions of cat auditory cortex and corticocortical projections to tonotopic (lower left) and non-tonotopic (lower right) areas. The topography of thalamic, commissural, and corticocortical projections to thirteen areas of auditory cortex (top) was studied with two retrograde tracers, cholera toxin beta subunit (large blue circles) and wheat germ apo horseradish peroxidase conjugated to gold (large yellow circles) or cholera toxin beta subunit gold conjugate (large yellow circle) in each experiment. The ensuing retrograde labeling (fine blue or gold dots) in the thalamus, ipsilateral cortex (lower left and right), and contralateral cortex was equally topographic for all areas studied according to three different measures, suggesting a common anatomical metric organizing extrinsic afferents to primary and secondary auditory areas, as well as input to multisensory association and limbic-related fields with auditory affiliations. See Lee and Winer, pp. 1804–1814.
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