Local connection patterns of parvalbumin-positive inhibitory interneurons in rat primary auditory cortex

► Excitatory and inhibitory neurons show different convergence pattern in rat auditory cortex. ►; Most retrogradely-labeled parvalbumin-positive (PV+) cells originate within ±0.5 mm of the convergence site. ► PV-negative cells show anisotropic distribution with more distant rostral-caudal convergence (>2 mm). ► Highest density of PV+ cells was found in layers IV and V.