Figure 1.

(A) Scheme of AL model network connectivity. Each of the eight OSN types (blue circles) contact only PNs in their corresponding glomerulus (green dashed circles) as indicated by the blue arrows. OSN types contact every LN, as indicated by the purple arrows reaching the dashed red circle containing the LNs. The PNs have reciprocal excitation within the same glomerulus (green arrows within the dashed green circles), can contact the LNs (green arrows entering the dashed red circle), and have reciprocal multiglomerular excitatory contacts with another single glomerulus (dashed black arrows show a few examples). The LNs have reciprocal inhibition and can contact the PNs (red lines ending in circles). (B–D) Neuromorphic basis for the AL model. Confocal micrographs show three female M. sexta ALs with lines indicating their representative location in the model schema of A. Each panel extracts a single optical orthogonal slice. Neurobiotin-injected cells were stained with Alexa-conjugated Streptavidin. Pictures were obtained by confocal microscopy of three separate whole mount brain preparations using a 10×, 0.45-NA objective lens (C-Apochromat, Zeiss). Optical sections (1024 × 1024 pixel) were taken at intervals of 0.8 μm. B displays a lateral interneuron, while C and D show a multiglomerular and uniglomerular PN, respectively; scale bar: 100 μm.