从时转变为速率编码的转变发生在体感性脑皮层道的体感性脑皮层路径中
E Ahissar1, R Sosnik, S Haidarliu
1Department of Neurobiology, The Weizmann Institute of Science, Rehovot, Israel. Ehud.Ahissar@weizmann.ac.il
Nature
|August 5, 2000
概括
与lemniscal路径不同的是,paralemniscal路径将胡须振动时间转换为速率代码.
科学领域:
- 神经科学是一个神经科学.
- 感官处理 感官处理
- 身体上的感觉 (somatosensation) 是一种感觉.
背景情况:
- 动物的胡须至体感皮层的通路包括lemniscal和paralemniscal系统.
- 由于空间分辨率差和神经元反应变化的原因,巴拉莱姆尼斯通路在触觉处理中的作用受到争论.
研究的目的:
- 为了研究如何对lemniscal路径编码振动的运动频率.
- 为了比较lemniscal和paralemniscal路径之间的时间编码策略.
主要方法:
- 在麻醉大鼠中记录了神经元对不同胡须运动频率的反应.
- 分析了神经元发射模式,延迟和两条路径中的振幅调制.
- 研究了甲状腺皮层循环,皮层振荡和甲状腺门的作用.
主要成果:
- 莱姆尼斯神经元表现出振幅调制和恒定延迟.
- 类似神经元通过延迟的变化来编码输入频率 (开始延迟增加,偏移延迟常数).
- 抛物线路中的延迟增量转化为速率代码 (较低的尖峰数量与增加的发病延迟).
结论:
- 帕拉莱姆尼斯系统通过可变延迟将时间振动信息转换为速率代码.
- 有效的皮质反和thalamocortical循环支持时间感官暗示处理在平行道.
- 莱姆尼斯系统的固定时间锁定对于空间处理至关重要,而帕拉莱姆尼斯系统则处理时间线索.
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