SPLTRAK Abstract Submission
Coding Spatiotemporal Characteristics of Odor Signals
Yuriy Bobkov1, Il Park2, Brenden Michaelis3, Thomas Matthews4, Matthew Reidenbach3, Jose Principe5, Barry Ache1,6
1Whitney Laboratory for Marine Bioscience, Center for Smell and Taste, University of Florida, Gainesville, FL, United States
2Department of Neurobiology and Behavior, SUNY Stony Brook, Stony Brook, NY, United States
3Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States
4Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute, Maraphon, FL, United States
5Department of Electrical and Computer Engineering, University of Florida,, Gainesville, FL, United States
6Department of Biology and Neuroscience, University of Florida, Gainesville, FL, United States

Published evidence has identified a subpopulation of ORNs in lobsters that consists of intrinsically rhythmically active, ‘bursting’ ORNs (bORNS) with unique functional properties: they encode olfactory information by having their rhythmicity entrained by the odor stimulus; they accurately encode the interval since the last odor encounter up to 10s of sec; they do this instantaneously, independent of memory; and that bORN-derived input provides a heretofore unsuspected way of navigating turbulent odor plumes.  We are currently extending this understanding by electrophysiological recording and calcium imaging from bORNs and interneurons in the first olfactory relay of the lobster.  To date we have characterized the molecular receptive range (MRR) of bORNs.  We show that the MRR of bORNs significantly overlaps that of canonical tonic ORNs (tORNs), arguing that bORNs and tORNs may target the same glomeruli in a receptor-specific manner.   We are in the process of functionally mapping the central projection of bORNs in an attempt to show that bORN-derived input is possibly selectively processed in a dedicated, midbrain neuropil, the accessory lobe (AL).  The AL is known from our previous work to receive olfactory input indirectly via olfactory lobe (OL) glomeruli, and project to the forebrain independently of and in parallel with the OL.  Based on our new functional evidence and previous understanding of the AL, we identify a potential strategy for synaptic processing of bORN-derived information at the first olfactory relay.  Our findings further support the hypothesis that encoding odor time is a fundamental feature of olfaction that can be used to navigate turbulent odor plumes.