Fig. 7. The enhancing effects of serotonin were greater in some antennal lobe (AL) regions than in others. (A) The average peak increase in the optical response was significantly greater in the toroid (54.9±8.0%, N=7) than in the cumulus (42.6%±10.2, P<0.05, N=7). (B) The enhancing effects of serotonin were significantly greater in the central cumulus than in the lateral cumulus (49.3±11.4% vs 39.0±11.4%; P<0.05, N=7). There were no significant differences in the enhancing effects of serotonin in the medial, central and lateral toroid. (C) The enhancing effects of serotonin were non-homogenously distributed in the Gs. The enhancing effects of serotonin in Gs3 were significantly greater than in Gs1, Gs4 and Gs5 (60.8±8.8% vs 32.0±11.8%, 37.7±5.8% and 21.2±13.8%, respectively; P<0.05, N=5). Error bars represent S.E.M.

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