Efferent influence upon the activity of single neurons in the olfactory bulb of the burbot.

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Abstract
The activity from single units in the olfactory bulb of the burbot (Lota lota) was studied during afferent and efferent inflow. Efferent activity was evoked by electrical stimulation of either the contralateral tract or a central part of the ipsilateral tract. Afferent volleys were induced by stimulating the olfactory nerve. Induced efferent activity caused either excitation or inhibition of a bulbar unit. The effects of efferent influence evoked by stimulation of the ipsilateral tract were similar to the effects evoked by stimulation of the contralateral tract. No post-inhibitory facilitation appeared in the present recordings. Single olfactory nerve stimulation typically produced a burst of impulses in the bulbar neurons, in contrast to the excitatory efferent inflow which induced only one spike.