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Related Experiment Videos

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
PubMed
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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.

Related Experiment Videos

  • 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.