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A sensory map of the odour world in the moth brain

Carlsson, Mikael (2003). A sensory map of the odour world in the moth brain. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Agraria, 1401-6249 ; 416
ISBN 91-576-6443-9
[Doctoral thesis]

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The functional organisation of the moth antennal lobe was studied using two species, Manduca sexta and Spodoptera littoralis, as model organisms. Glomerular activity was investigated at the population level by means of optical imaging techniques. In the male-specific macroglomerular complex (MGC), responses to pheromone compounds corroborated earlier results obtained from single cell recordings, i.e. different compartments of the MGC responded specifically to one component of the pheromone. Among the sexually isomorphic glomeruli the responses to plant-associated compounds were more distributed but odour-specific and similar across individuals of both sexes. Several glomeruli were activated by a single compound and each glomerulus was activated by several different compounds. Thus, broad tuning and overlapping responses suggest an across-glomerular coding mechanism for non-pheromones. Using series of homologous aliphatic compounds revealed that the highest correlation between activity patterns was always found for compounds with the same functional group and with minimal difference in carbon chain length. A concentration-dependence of glomerular activity was found. Increased concentration resulted in a recruitment of activated glomeruli. The single most activated glomerulus was often not the same across concentrations. The movement, however, was generally restricted to neighbouring glomeruli. Furthermore, activity patterns elicited by different odorants were more similar at high than at low stimulus doses. A method to selectively stain a large population of projection neurons with a Ca2+ sensitive dye was applied to S. littoralis. Also at the output level glomeruli were broadly tuned and activity patterns evoked by different odours overlapped each other. Temporal differences were found both between stimuli and between glomeruli. Glomerular activity patterns evoked by different odours became less similar as a function of time.

Authors/Creators:Carlsson, Mikael
Title:A sensory map of the odour world in the moth brain
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Agraria
Year of publishing :September 2003
Number of Pages:43
ALLI. Carlsson MA, Galizia CG, Hansson BS. 2002. Spatial representation of odours in the antennal lobe of the moth Spodoptera littoralis (Lepidoptera: Noctuidae). Chem. Senses. 27(3), 231-244. II. Meijerink J, Carlsson MA, Hansson BS. 2003. Spatial representation of odorant structure in the moth antennal lobe: a study of structure response relationships at low doses. J. Comp. Neurol. In Press. III. Hansson BS, Carlsson MA, Kalinova B. 2003. Olfactory activation patterns in the antennal lobe of the sphinx moth, Manduca sexta. J. Comp. Physiol. A. 189(4), 301-308. IV. Carlsson MA, Hansson BS. 2003. Dose-response characteristics of glomerular activity in the moth antennal lobe. Chem. Senses. 28(4), 269-278. V. Carlsson MA, Hansson BS. Spatio-temporal dynamics of olfactory output neurons in the moth antennal lobe. Submitted.
Place of Publication:Alnarp
ISBN for printed version:91-576-6443-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:X Agricola extesions > X30 Life sciences
Subjects:Not in use, please see Agris categories
Agrovoc terms:olfaction, smell, chemical structure, pheromones, organic compounds, manduca sexta, spodoptera littoralis
Keywords:olfaction, odour representation, spatial coding, temporal coding, receptor neuron, projection neuron, chemical structure
Permanent URL:
ID Code:339
Department:(NL, NJ) > Institutionen för växtvetenskap
Deposited By: mikael carlsson
Deposited On:05 Sep 2003 00:00
Metadata Last Modified:02 Dec 2014 10:03

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