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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
Modulation of thalamic auditory neurons by the primary auditory cortex.
Jie Tang1, Weiguo Yang, Nobuo Suga
1Department of Biology, Washington University, St. Louis, Missouri 63130, USA.
Journal of Neurophysiology
|May 4, 2012
Summary
The central auditory system
Area of Science:
- Neuroscience
- Auditory System Research
Background:
- The central auditory system comprises distinct lemniscal and nonlemniscal pathways.
- The medial geniculate body (MGB) in the thalamus has divisions belonging to these systems: MGBv (lemniscal) and MGBm/MGBd (nonlemniscal).
- Lemniscal neurons offer precise frequency tuning, while nonlemniscal neurons have broader tuning and wider projections.
Purpose of the Study:
- To investigate the distinct plastic changes elicited by the auditory cortex (AI) in the lemniscal (MGBv) and nonlemniscal (MGBm) pathways.
- To understand how AI modulates thalamic auditory processing and its implications for fine-tuning auditory information.
Main Methods:
- Electrical stimulation of specific medial geniculate body (MGB) divisions (MGBv and MGBm) to observe effects on auditory cortex (AI) neuron tuning.
- Electrical stimulation of the auditory cortex (AI) to assess its impact on MGBv and MGBm neuron frequency tuning and responses.
Main Results:
- Stimulating MGBv neurons induced tone-specific plasticity in AI neurons, shifting their tuning curves.
- Stimulating MGBm neurons augmented AI responses and broadened their tuning curves (nonspecific plasticity).
- AI stimulation induced tone-specific plasticity in MGBv neurons but degraded MGBm neuron tuning by inhibiting responses.
Conclusions:
- The auditory cortex differentially modulates lemniscal and nonlemniscal thalamic pathways.
- High MGBv activity enhances AI's suitability for fine auditory signal processing.
- High MGBm activity may hinder fine auditory processing in AI, while AI stimulation reduces MGBm activity.
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