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首页> 外文期刊>Journal of Neurophysiology >Vertical Purkinje cells of the monkey floccular lobe: simple-spike activity during pursuit and passive whole body rotation.
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Vertical Purkinje cells of the monkey floccular lobe: simple-spike activity during pursuit and passive whole body rotation.

机译：猴子絮状叶的垂式浦肯野细胞：追赶过程中的短钉活动和被动的全身旋转。

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To understand how the simian floccular lobe is involved in vertical smooth pursuit eye movements and the vertical vestibuloocular reflex (VOR), we examined simple-spike activity of 70 Purkinje (P) cells during pursuit eye movements and passive whole body rotation. Fifty-eight cells responded during vertical and 12 during horizontal pursuit. We classified P cells as vertical gaze velocity (VG) if their modulation occurred for movements of both the eye (during vertical pursuit) and head (during pitch VOR suppression) with the modulation during one less than twice that of the other and was less during the target-fixed-in-space condition (pitch VOR X1) than during pitch VOR suppression. VG P cells constituted only a minority of vertical P cells (19%). Other vertical P cells that responded during pitch VOR suppression were classified as vertical eye and head velocity (V/) P cells (48%), regardless of the synergy of their response direction during smooth pursuit and VOR suppression. Vertical P cells that did not respond during pitch VOR suppression but did respond during rotation in vertical planes other than pitch were classified as off-pitch V/ P cells (33%). The mean eye-velocity and eye-position sensitivities of the three types of vertical P cells were similar. One-third (2/7 VG, 2/11 V/, 6/13 off-pitch V/), in addition, showed eye position sensitivity during saccade-free fixations. Maximal vestibular activation directions (MADs) were examined during VOR suppression by applying vertical whole body rotation with the monkeys oriented in different vertical planes. The MADs for VG P cells and V/ P cells with eye and vestibular sensitivity in the same direction were distributed near the pitch plane, suggesting convergence of bilateral anterior canal inputs. In contrast, MADs of off-pitch V/ P cells and V/ P cells with oppositely directed eye and vestibular sensitivity were shifted toward the roll plane, suggesting convergence of anterior and posterior canal inputs of the same side. Unlike horizontal G P cells, the modulation of many VG and V/ P cells when the target was fixed in space (pitch VOR X1) was not well predicted by the linear addition of their modulations during vertical pursuit and pitch VOR suppression. These results indicate that the populations of vertical and horizontal eye-movement P cells in the floccular lobe have markedly different discharge properties and therefore may be involved in different kinds of processing of vestibular-oculomotor interactions.
机译：为了了解猿猴絮状叶是如何参与垂直平滑追踪眼运动和垂直前庭眼反射（VOR）的，我们研究了70个Purkinje（P）细胞在追踪眼睛运动和被动全身旋转过程中的简单峰值活动。在垂直方向有58个单元格，在水平方向有12个单元格。如果将P细胞的调制发生在眼睛（垂直追赶期间）和头部（在俯仰VOR抑制期间）的运动中，并且调制的时间小于另一个，则将其归为垂直凝视速度（VG）。目标空间固定条件（音高VOR X1）比音高VOR抑制期间要好。 VG P细胞仅占垂直P细胞的一小部分（19％）。在音高VOR抑制期间做出响应的其他垂直P细胞被分类为垂直眼和头部速度（V /）P细胞（48％），而与平滑追随和VOR抑制期间响应方向的协同作用无关。在音高VOR抑制期间不响应但在音高以外的垂直平面中旋转时确实响应的垂直P单元归类为音高V / P单元（33％）。三种类型的垂直P细胞的平均眼速度和眼位置敏感性相似。此外，三分之一（2/7 VG，2/11 V /，6/13偏音V /）在无扫视的注视过程中表现出眼睛位置敏感性。在VOR抑制过程中，通过对猴子进行垂直垂直旋转并在不同垂直平面上定向的猴子，检查了最大前庭激活方向（MAD）。眼和前庭敏感性在同一方向上的VG P细胞和V / P细胞的MAD分布在俯仰平面附近，提示双侧前管输入汇聚。相反，斜距V / P细胞和具有相反方向的眼睛和前庭敏感性的V / P细胞的MAD向侧倾平面移动，表明同一侧的前，后管输入会聚。与水平G P单元不同，通过在垂直追逐和音高VOR抑制过程中线性增加调制，无法很好地预测将目标固定在空间中时许多VG和V / P单元的调制（音高VOR X1）。这些结果表明，在眼球中垂直和水平的眼动P细胞群具有明显不同的放电特性，因此可能参与了不同类型的前庭动眼运动相互作用的处理。

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