在小鼠初级视觉皮层中,皮层对相互冲突的双眼刺激的反应
bioRxiv : the preprint server for biology
|January 13, 2025
概括
大脑整合两只眼睛的视觉输入来感知深度,但处理图像差异的神经机制尚不清楚. 这项研究揭示了小鼠视觉皮层对整眼相对定向差异的独特神经反应.
科学领域:
- 神经科学是一个神经科学.
- 视觉科学 视觉科学 视觉科学
- 计算神经科学是一种神经科学.
背景情况:
- 双眼视觉整合了来自两个眼睛的信息,以创建一个统一的感知.
- 眼间差异对于深度感知 (立体感知) 至关重要,但如果不正确处理,可能会导致双眼视或竞争.
- 在视觉皮层中处理双眼差异的精确神经机制在很大程度上是未知的.
研究的目的:
- 为了研究两种不同类型的双眼差异处理的基础的神经机制:整眼相位差异和整眼方向差异.
- 为了区分与这些两种差异类型相关的神经电路动力学,在小鼠初级视觉皮层 (bV1) 中进行了区分.
主要方法:
- 使用了体内电生理学 (视觉唤起电位 (VEP) 记录,单元记录) 和2光子成像的组合.
- 在二光学刺激下记录了小鼠初级视觉皮层 (bV1) 的双眼区域的神经活动.
- 在格刺激中引入了空间整眼相差异和整眼方向差异.
主要成果:
- 眼间阶段差异通过减少早期神经元发射 (40-80毫秒) 来降低VEP大小.
- 眼际定向差异也减少了VEP大小,但与激发性和抑制性神经元中晚期神经元发射 (100-200毫秒) 的增加有关.
- 索马托斯塔丁阳性内部神经元在对整眼方向差异的反应中表现出活动减少.
结论:
- 眼间相位差异似乎主要通过向前送的甲状腺皮层通路抑制了bV1反应.
- 眼间定位的差异可能会通过由索马托斯塔丁阳性内部神经元介导的消抑制来延长bV1的活动.
- 这些发现阐明了处理不同类型的双眼视觉信息的不同神经战略.
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