Serotonin in concentration of 0.0025% increased the excitability of chemoreceptors and the dancing rhythm rate in honey bees; higher concentrations diminished electrical activity in the second thoracic ganglion, lowered dancing rhythm rate and accelerated the alteration of food conditioning reflexes. Serotonin exerted no effect on the excitability thresholds of the peripheral nervous activity. A possibility of serotoninergic mediation of neural event in disruption of genetically determined tryptophan metabolic pathways (tryptophanuria) is discussed.
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