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Updated: Jun 8, 2025
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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
Published on: October 11, 2017
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Direct Piriform-to-Auditory Cortical Projections Shape Auditory-Olfactory Integration
Nathan W Vogler1, Ruoyi Chen1, Alister Virkler2
1Departments of Otorhinolaryngology, Perelman School of Medicine, University of Pennsylvania.
Summary
The brain integrates sound and smell through direct connections between the piriform cortex and auditory cortex. This olfactory input modulates auditory processing, revealing new insights into sensory integration.
Area of Science:
- Neuroscience
- Sensory Integration
- Auditory-Olfactory Processing
Background:
- The brain integrates multisensory information, but neuronal circuits for auditory-olfactory integration are poorly understood.
- The auditory cortex is a potential site for integrating sound and smell information.
Purpose of the Study:
- To investigate the neuronal mechanisms of auditory-olfactory integration.
- To identify the role of piriform cortex projections to the auditory cortex in modulating sound processing by odors.
Main Methods:
- Anatomical tracing (viral strategies) to map piriform cortex to auditory cortex projections.
- In vivo electrophysiology in awake mice to record auditory cortical responses to sound and odors.
- In vivo optogenetics to manipulate piriform cortex activity during electrophysiological recordings.
Main Results:
- Direct projections from the piriform cortex to the auditory cortex were identified.
- Odors were found to modulate auditory cortical responses to sound in mice.
- Optogenetic inhibition of piriform cortex input reduced odor-driven enhancement of auditory responses.
Conclusions:
- A direct piriform cortex to auditory cortex pathway is crucial for olfactory modulation of auditory processing.
- This circuitry plays a significant role in auditory-olfactory integration within the auditory cortex.
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