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Auditory-cued behavioral training can alter neural circuits in primary auditory cortex (A1), but the mechanisms and consequences of experience-dependent cortical plasticity are not fully understood. To address this issue, we trained adult rats to detect a 5kHz target in order to receive a food reward. After 14days training we identified three locations within A1: (i) the region representing the characteristic frequency (CF) 5kHz, (ii) a nearby region with CF ∼10kHz, and (iii) a more distant region with CF ∼20kHz. In order to compare functional connectivity in A1 near to, vs. far from, the representation of the target frequency, we placed a 16-channel multiprobe in middle- (∼10kHz) and high- (∼20kHz) CF regions and obtained current-source density (CSD) profiles evoked by a range of tone stimuli (CF±1–3 octaves in quarter-octave steps). Our aim was to construct “CSD receptive fields” (CSD RFs) in order to determine the …