Insect antenna is a multisensory organ. each modality of which can be modulated by biogenic amines. Octopamine (OA) and its metabolic precursor tyramine (TA) affect activity of antennal olfactory receptor neurons. There is some evidence that dopamine (DA) modulates gustatory neurons. https://www.hollandscountryclothinges.shop/product-category/horse-bit-accessories/