Antennal receptive fields of pheromone-responsive projection neurons in the antennal lobes of the male sphinx moth Manduca sexta |
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Authors: | T Heinbockel J G Hildebrand |
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Institution: | Otto-von-Guericke-Universit?t, Institut für Physiologie, Leipziger Str. 44, D-39120 Magdeburg, Germany, DE Arizona Research Laboratories Division of Neurobiology, University of Arizona, PO Box 210077, Tucson AZ 85721-0077, USA Tel.: +1-520 621-6626; Fax: +1-520 621-8282 e-mail: jgh@neurobio.arizona.edu, US
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Abstract: | Stimulation of the antenna of the male moth, Manduca sexta, with a key component of the female's sex pheromone and a mimic of the second key component evokes responses in projection
neurons in the sexually dimorphic macroglomerular complex of the antennal lobe. Using intracellular recording and staining
techniques, we studied the antennal receptive fields of 149 such projection neurons. An antennal flagellum was stimulated
in six regions along its proximo-distal axis with one or both of the pheromone-related compounds while activity was recorded
in projection neurons. These neurons fell mainly into two groups, based on their responses to the two-component blend: neurons
with broad receptive fields that were excited when any region of the flagellum was stimulated, and neurons selectively excited
by stimulation of the proximal region of the flagellum. Projection neurons that were depolarized by stimulation of one antennal
region were not inhibited by stimulation of other regions, suggesting absence of antennotopic center-surround organization.
In most projection neurons, the receptive field was determined by afferent input evoked by only one of the two components.
Different receptive-field properties of projection neurons may be related to the roles of these neurons in sensory control
of the various phases of pheromone-modulated behavior of male moths.
Accepted: 30 January 1998 |
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Keywords: | Antenna CNS Glomerulus Insect Olfaction |
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