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首页> 外文期刊>Brain research >Sound-induced changes of infraslow brain potential fluctuations in the medial geniculate nucleus and primary auditory cortex in anaesthetized rats.
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Sound-induced changes of infraslow brain potential fluctuations in the medial geniculate nucleus and primary auditory cortex in anaesthetized rats.

机译：麻醉大鼠的内侧膝状核和初级听觉皮层的超音速脑电势波动的声音诱导变化。

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摘要

Recent publications indicate the presence of infraslow activity (<0.5 Hz) in subcortical and cortical sites of the auditory system of the brain. It has been reported that this activity might be sensitive to acoustic stimuli. Yet the dynamics of infraslow brain potential (ISBP) fluctuations in these structures and their potential sensitivity to auditory stimuli are unknown. The present study was performed in order to test the hypothesis that extracellular ISBP activity in the medial geniculate nucleus (MGN) and the primary auditory cortex (A1) responds concurrently to acoustic stimuli. The experimental subjects were 5 adult rats with chronic stereotaxic electrodes implanted in MGN and A1. The animals were anesthetized and recordings were made in both sites during both silence and rhythmical acoustic stimulation. Our results support the hypothesis that these fluctuations are sensitive to acoustic stimuli. There were similar changes in ISBP activity in the MGN and A1 in response to rhythmic acoustic stimulation. Specifically, there were significant increases in the frequency range of seconds. Based on these findings, we suggest that sound-correlated changes in infraslow activity in the range of seconds in the MGN and A1 reflect specific mechanisms of neural processing of acoustic information in the auditory system of the brain.
机译：最近的出版物表明在大脑听觉系统的皮层下和皮层部位存在超低活动（<0.5 Hz）。据报道，这种活动可能对声刺激敏感。然而，这些结构中的超低脑电势（ISBP）波动及其对听觉刺激的潜在敏感性尚不清楚。进行本研究是为了检验以下假设：内侧膝状核（MGN）和初级听觉皮层（A1）中的细胞外ISBP活性同时对声刺激做出响应。实验对象是5只成年大鼠，其具有在MGN和A1中植入的慢性立体定向电极。麻醉动物，并在静音和有节奏的声学刺激过程中在两个部位进行记录。我们的结果支持以下假设：这些波动对声刺激敏感。响应有节奏的声刺激，MGN和A1的ISBP活性也有类似的变化。具体而言，秒数的频率范围显着增加。基于这些发现，我们建议在MGN和A1的几秒钟内，次声活动的声音相关变化反映出大脑听觉系统中对声音信息进行神经处理的特定机制。

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