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The Journal of Neuroscience, February 15, 2001, 21(4):1351-1360
Tuning and Topography in an Odor Map on the Rat Olfactory
Bulb
Markus
Meister1, 2 and
Tobias
Bonhoeffer2
1 Harvard University, Cambridge, Massachusetts 02138, and 2 Max Planck Institute of Neurobiology, D-82152
Munich-Martinsried, Germany
The sense of smell originates in a diverse array of receptor
neurons, comprising up to 1000 different types. To understand how these
parallel channels encode chemical stimuli, we recorded the responses of
glomeruli in the olfactory bulbs of the anesthetized rat, by optical
imaging of intrinsic signals. Odor stimulation produced two kinds of
optical responses at the surface of the bulb: a broad diffuse component
superposed by discrete small spots. Histology showed that the spots
correspond to individual glomeruli, and that ~400 of them can be
monitored in this way. Based on its wavelength-dependence, this optical
signal appears to derive from changes in light scattering during neural
activity. Pure odorants generally activated several glomeruli in a
bilaterally symmetric pattern, whose extent varied greatly with
concentration. A simple formalism for ligand binding accounts
quantitatively for this concentration dependence and yields the
effective affinity with which a glomerulus responds to an odorant. When
tested with aliphatic molecules of increasing carbon chain length, many
glomeruli were sharply tuned for one or two adjacent chain lengths.
Glomeruli with similar tuning properties were located near each other,
producing a systematic map of molecular chain length on the surface of
the olfactory bulb. Given local inhibitory circuits within the
olfactory bulb, this can account for the observed functional inhibition between related odors. We explore several parallels to the function and
architecture of the visual system that help interpret the neural
representation of odors.
Key words:
olfaction; receptor; glomerulus; map; tuning; imaging
Copyright © 2001 Society for Neuroscience 0270-6474/01/2141351-10$05.00/0
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