Olfactory oscillations augment odor discrimination not odor identification by Limax CNS

THERE is great interest in the function of synchronous oscillations in olfactory centers, as documented in a wide variety of species. In Limax procerebral (PC) lobe, local field potential oscillations are ongoing and altered by odor stimulation. Recordings from external peritentacular nerves (ePTNs) reveal a neural correlate of tentacle positioning, a response signifying recognition of a conditioned odor. Using the odor-elicited ePTN response we found no clear difference in the dynamics of the PC oscillations which precedes and predicts the occurrence of ePTN responses. Reversibly blocking the oscillations did not impair recognition of conditioned odors but reduced the differential nerve response to related odors. PC oscillations may play a role in odor discrimination but are not necessary for odor recognition, NeuroReport 10:1061-1068 (C) 1999 Lippincott Williams & Wilkins.