Posteromedial thalamic nucleus activity significantly contributes to perceptual discrimination.

Posteromedial thalamic nucleus activity significantly contributes to perceptual discrimination.
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DOI:
10.1371/journal.pbio.3001896
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发表时间:
2022-11
期刊:
影响因子:
9.8
通讯作者:
--
中科院分区:
生物学1区
文献类型:
--
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高阶感觉丘脑核与多个皮层和皮层下区域紧密相连,但这些核的作用尚不清楚。后内侧丘脑核(POm)是啮齿动物体感觉系统中的高阶丘脑核,是一个与多个感觉和运动脑区广泛联系的解剖中枢,但对被动感觉刺激和须运动的反应较弱。为了了解POm在感觉知觉中的作用,我们在自由移动的小鼠中开发了一个自我启动的,两种选择的强迫选择任务。通过光遗传学和化学遗传学操作,我们发现POm在感觉知觉中起着重要作用,并且从初级体感觉皮层到POm的投射对于POm在主动感知过程中的感觉知觉贡献至关重要。高阶感觉丘脑核与多个皮层和皮层下区域紧密相连,但其作用尚不清楚。本研究表明,在主动感知过程中,丘脑后内侧核(POm)整合来自皮层的信息,在感觉知觉中起着重要作用。
Higher-order sensory thalamic nuclei are densely connected with multiple cortical and subcortical areas, yet the role of these nuclei remains elusive. The posteromedial thalamic nucleus (POm), the higher-order thalamic nucleus in the rodent somatosensory system, is an anatomical hub broadly connected with multiple sensory and motor brain areas yet weakly responds to passive sensory stimulation and whisker movements. To understand the role of POm in sensory perception, we developed a self-initiated, two-alternative forced-choice task in freely moving mice during active sensing. Using optogenetic and chemogenetic manipulation, we show that POm plays a significant role in sensory perception and the projection from the primary somatosensory cortex to POm is critical for the contribution of POm in sensory perception during active sensing. Higher-order sensory thalamic nuclei are densely connected with multiple cortical and subcortical areas, but their role remains elusive. This study shows that during active sensing, the posteromedial thalamic nucleus (POm) integrates information from the cortex and plays a significant role in sensory perception.
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