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High-resolution Measurement of Odor-Driven Behavior in Drosophila Larvae

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Keeping their distance? Odor response patterns along the concentration range.

Martin Strauch¹, Mathias Ditzen, C Giovanni Galizia

¹Department of Neurobiology, University of Konstanz Konstanz, Germany ; Bioinformatics and Information Mining, University of Konstanz Konstanz, Germany.

Frontiers in Systems Neuroscience

|October 23, 2012

Summary

Honeybee olfactory responses in the antennal lobe (AL) change with odor concentration. Increased concentration broadens glomerular response patterns, improving odor discrimination by aligning neural and chemical distances.

Keywords:

calcium-imaging chemical dissimilarity glomerular pattern honeybees odor concentration coding odor identity coding

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Area of Science:

Neuroscience
Olfactory Coding
Insect Behavior

Background:

The honeybee antennal lobe (AL) is the primary olfactory center.
Odors are encoded by spatio-temporal patterns of glomerular responses.
Odor concentration influences these response patterns.

Purpose of the Study:

Investigate how odor identity and concentration are coded in the honeybee AL.
Understand the relationship between neural response patterns and chemical properties of odorants.
Explain enhanced odor discrimination at higher concentrations.

Main Methods:

Calcium-imaging recordings in the honeybee antennal lobe.
Analysis of spatio-temporal response patterns of olfactory glomeruli.
Comparison of glomerular response pattern distances with chemical distances of odor molecules.

Main Results:

Odor concentration recruitment of glomerular responses leads to pattern broadening.
Pattern broadening brings glomerular response pattern distances closer to chemical distances.
This effect is observed in the honeybee Apis mellifera.

Conclusions:

Pattern broadening in the AL is a key mechanism for odor concentration coding.
This mechanism explains improved honeybee odor discrimination at higher concentrations.
Findings provide insights into the neural basis of olfactory perception in insects.