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Updated: Dec 26, 2025
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Published on: October 11, 2017
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Contextual and cross-modality modulation of auditory cortical processing through pulvinar mediated suppression
Xiao-Lin Chou1,2, Qi Fang1,2, Linqing Yan1
1Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, United States.
Elife
|March 7, 2020
Summary
The lateral posterior nucleus (LP) enhances auditory processing in the primary auditory cortex (A1) by sharpening neural responses and increasing signal clarity. This pathway is crucial for modulating auditory perception based on sensory context.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Sensory Processing
Background:
- The lateral posterior nucleus (LP), a thalamic nucleus homologous to the primate pulvinar, extensively projects to sensory cortices.
- Its precise functional role in sensory cortical processing, particularly auditory processing, remains largely undetermined.
Purpose of the Study:
- To elucidate the functional role of the LP in auditory cortical processing.
- To investigate how LP modulates activity in the primary auditory cortex (A1).
Main Methods:
- Bidirectional activity modulations of the LP and its projections to the primary auditory cortex (A1) in awake mice.
- Electrophysiological recordings in supragranular-layer neurons of A1.
- Investigation of LP's activation by sensory signals from the superior colliculus (SC).
Main Results:
- LP stimulation or its projection to A1 enhances auditory processing in A1 supragranular-layer neurons.
- LP improves receptive field sharpness, frequency tuning, and signal-to-noise ratio (SNR) in A1.
- A subtractive-suppression mechanism, involving LP axons innervating inhibitory neurons, underlies LP's effects.
- LP is activated by SC sensory signals, contributing to A1 processing maintenance during background noise and threat detection.
Conclusions:
- The LP plays a significant role in enhancing auditory cortical processing.
- A multisensory bottom-up pathway involving the superior colliculus, LP (pulvinar), and A1 modulates auditory processing based on context and cross-modal sensory information.
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