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Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
Published on: October 31, 2011
Brain mechanisms for extracting spatial information from smell
Jess Porter1, Tarini Anand, Brad Johnson
1Program in Biophysics, University of California, Berkeley, Berkeley, California 94720, USA. jessiep@calmail.berkeley.edu
Neuron
|August 17, 2005
Summary
Scientists found how the brain determines an odor
Area of Science:
- Neuroscience
- Olfactory processing
- Sensory integration
Background:
- The ability to locate odor sources is crucial for survival.
- Previous research by von Békésy highlighted the importance of comparing olfactory input between nostrils for spatial localization.
- The neural mechanisms underlying this olfactory spatial comparison remain largely unknown.
Purpose of the Study:
- To investigate the neural basis of olfactory spatial localization.
- To determine how the brain processes information from each nostril to determine an odor's location.
- To explore the relationship between olfactory localization and identification.
Main Methods:
- Odorants were delivered to either the left or right nostril.
- Brain activity was measured using functional neuroimaging during olfactory localization and identification tasks.
- Nostril-specific brain responses were analyzed in relation to localization accuracy.
Main Results:
- Nostril-specific neural activity in the primary olfactory cortex predicted the accuracy of left-right odor localization.
- A distinct region within the superior temporal gyrus, known for visual and auditory localization, was preferentially activated during olfactory localization.
- These findings suggest a convergence of spatial processing for multiple sensory modalities.
Conclusions:
- The study identifies a neural substrate in the primary olfactory cortex for comparing bilateral olfactory input to determine odor source location.
- Olfactory spatial information is processed in a brain region that also handles spatial information from vision and audition.
- This suggests a shared neural system for multisensory spatial representation.
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