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Updated: Feb 25, 2026

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
Published on: October 11, 2017
Cortical Interneurons Differentially Regulate the Effects of Acoustic Context
Elizabeth A K Phillips1, Christoph E Schreiner1, Andrea R Hasenstaub1
1Coleman Memorial Laboratory, University of California, San Francisco, San Francisco, CA 94158, USA; Neuroscience Graduate Program, University of California, San Francisco, San Francisco, CA 94158, USA; Department of Otolaryngology - Head and Neck Surgery, University of California, San Francisco, San Francisco, CA 94158, USA; Kavli Institute for Theoretical Physics, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
Specific interneurons in the auditory cortex control how sounds are perceived based on context. Suppressing somatostatin-positive (Sst+) interneurons weakens forward suppression, while inactivating parvalbumin-positive (Pvalb+) interneurons strengthens it.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Computational Neuroscience
Background:
- Auditory perception is influenced by acoustic context.
- Forward suppression (FWS) is a phenomenon where a preceding sound suppresses responses to a subsequent, similar sound in the auditory cortex.
- The precise neural mechanisms, particularly the role of inhibitory interneurons, in shaping FWS are debated.
Purpose of the Study:
- To investigate the distinct roles of somatostatin-positive (Sst+) and parvalbumin-positive (Pvalb+) interneurons in modulating forward suppression within the auditory cortex.
- To elucidate how these interneuron populations contribute to the context-dependent processing of auditory information.
Main Methods:
- Optogenetic manipulation of Sst+ and Pvalb+ interneuron activity in vivo.
- Electrophysiological recordings to measure neural responses to auditory stimuli.
- Development and analysis of a simple network model to simulate observed effects.
Main Results:
- Optogenetic suppression of Sst+ interneurons significantly weakened forward suppression, sometimes leading to facilitation.
- Inactivation of Pvalb+ interneurons enhanced forward suppression and modified its frequency dependency.
- Network modeling indicated that differential short-term synaptic dynamics onto Pvalb+ and Sst+ interneurons explain these experimental findings.
Conclusions:
- Somatostatin-positive and parvalbumin-positive interneurons play distinct and crucial roles in regulating forward suppression.
- These findings highlight specific inhibitory circuits that govern the context-dependent nature of auditory processing.
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