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Effect of TTX perfusion during repeated locus coeruleus stimulation on extracellular NA and DA levels in the occipital cortex. Stimuli were delivered in bursts, as described in Methods (horizontal solid lines). TTX perfusion started with the third stimulation administration, as indicated by the dashed line. Data are means ± SE, expressed as percent of mean basal value. Filled symbols indicate p < 0.05 with respect to basal values (Dunnett test).
