Dual olfactory system

The vertebrates produce, send and detect information which is conveyed by one or more molecular types. Chemical information of biological value (semiochemicals) which partly or wholly activates the accessory olfactory system (AOS) is transferred during intra- and inter-species communication. The compounds involved convey messages of social importance originating from the need to co-ordinate gamete release. It seems quite likely that gradual improvements by selection of semiochemical molecules and their receptors eventually enhanced the reproductive benefits both for the sender and for the receiver (Sorensen, 1996). The dual olfactory systems interpret chemical input to allow the discrimination of odour... 

Raisman G. (1972). An experimental study of the projection of the amygdala to the accessory olfactory bulb and its relationship to the concept of a dual olfactory system. Exp Brain Res 14, 395-404. 

Bean, N. J. (1982). Modulation of agonistic behavior by the dual olfactory system in male mice. Physiology and Behavior 29,433-437. 

Such a system includes dual dispensers on parallel air tubes. The airstreams therein can be separate or mixed to give a separate stimulation of the two olfactory epitheha or simultaneous stimulation of both epitheha. 

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