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首页> 外文期刊>Journal of vision >Responses of macaque MT neurons to multi-stable moving patterns
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Responses of macaque MT neurons to multi-stable moving patterns

机译：猕猴MT神经元对多稳态运动模式的反应

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摘要

Neurons in area MT are sensitive to the direction of motion of gratings and of plaids made by summing two gratings moving in different directions. MT component-direction-selective (CDS) neurons respond independently to the gratings of a plaid, while pattern-direction-selective (PDS) neurons combine component information to respond selectively to plaids that move in the direction preferred by single gratings. Adding a third moving grating creates a multistable a??triplaida??, which alternates perceptually among different groupings of gratings and plaids. To examine how this multistable motion percept might relate to the activity of CDS and PDS neurons, we measured the activity of 77 MT neurons in anaesthetized macaques to triplaid stimuli in which three identical moving gratings whose directions were separated by 120 deg were introduced successively going from a grating (320 ms) to a plaid (320 ms) to a triplaid (1280 ms). CDS and PDS neurons a?? selected based on their responses to gratings and plaids a?? responded strikingly differently to triplaids. CDS neurons maintained their tuning properties for more than 1 s, but PDS neurons were slowly and progressively suppressed and lost their direction tuning properties altogether after 0.3a??0.6 s. PDS but not CDS responses to triplaids also depended on the order in which the three components were introduced. We wondered whether these effects might be due to anesthesia and therefore repeated the experiment in area MT of an awake macaque performing a fixation task. Responses to the onset of individual gratings were more transient in the awake macaque than under anesthesia, but the sustained suppression of PDS responses persisted in both conditions. We attribute the differences between CDS and PDS response properties to an opponent suppression that is more potent in PDS cells, and discuss how area MT might contribute to the multistable perception of direction in moving triplaids.
机译：MT区域中的神经元对光栅和格子的运动方向敏感，这些格子是通过将两个在不同方向上运动的格子相加而制成的。 MT组件方向选择（CDS）神经元独立地响应格子的光栅，而图案方向选择（PDS）神经元组合组件信息以选择性地响应在单个栅格首选方向上移动的格子。增加第三个移动的光栅会产生一个多稳态的“ triplaida”，它在光栅和格子的不同组之间在感知上交替。为了检查这种多稳态运动感知可能与CDS和PDS神经元的活动有何关系，我们测量了麻醉猕猴中77 MT MT神经元对三重刺激的活动，其中依次引入了三个相同的移动光栅，其方向相隔120度，从光栅（320 ms）到格子（320 ms）到三重格子（1280 ms）。 CDS和PDS神经元根据他们对光栅和格子的反应选择？对三重奏的反应截然不同。 CDS神经元保持其调谐特性超过1 s，但PDS神经元在0.3a ?? 0.6 s后被缓慢而逐步地抑制并完全失去方向调谐特性。 PDS对三重奏的响应而不是CDS的响应也取决于引入这三个组件的顺序。我们想知道这些效果是否可能是由于麻醉引起的，因此我们在执行固定任务的清醒猕猴MT区域重复了该实验。在清醒的猕猴中，对单个光栅开始的反应比在麻醉下更为短暂，但是在两种情况下都持续抑制了PDS的反应。我们将CDS和PDS响应属性之间的差异归因于在PDS单元中更有效的对手抑制，并讨论了MT区域可能如何有助于移动三叠系方向的多稳态感知。

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