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首页> 外文期刊>Journal of vision >Compensation of heading tuning for eye pursuit in Macaque area VIP: Retinal and extra-retinal contributions
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Compensation of heading tuning for eye pursuit in Macaque area VIP: Retinal and extra-retinal contributions

机译：猕猴区域VIP中眼追踪标题调整的赔偿：视网膜和超视网膜贡献

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Moving in a 3D environment results in a projected vector field on the retina termed optic flow. For linear translations, this pattern is radially symmetric around a a??Focus of Expansiona?? (FOE) corresponding to the heading direction. Eye movements introduce rotations which disrupt the FOE, obscuring the true heading. Psychophysical studies show that humans are capable of perceiving their true heading despite pursuit eye movements. Two strategies that the brain can use to recover heading in the presence of rotations include (i) Subtracting extra-retinal velocity signals from optic flow (ii) Using visual information present in retinal cues to separate translation from rotation based on the differences in their flow properties. To evaluate the contributions of each strategy, we introduce rotations to translational flow fields using eye pursuit (real pursuit, RP) or add rotation to the stimulus, simulating eye pursuit during fixation (simulated pursuit, SP). RP and SP produce the same retinal stimulation, but SP lacks extra-retinal signals. Heading stimuli (3D dot cloud) is presented for both conditions while recording extracellularly from macaque ventral intraparietal area (VIP), which has both heading direction tuning and eye pursuit responses. We compared the full tuning curve for translations in the horizontal plane to the tuning during RP/SP. We observe slightly larger shifts in tuning (indicating incomplete compensation) for SP than RP, but much smaller than a purely extra-retinal strategy suggests. This study presents neural evidence in support of a combination of retinal and extra-retinal cues for pursuit compensation. We also observe larger gain fields during RP compared to SP, suggesting that gain fields can encode the presence of eye rotations. These gain fields can potentially be useful for identifying whether the rotation present in retinal cues is a result of eye movements or another source such as head movements, or moving on a curved path.
机译：在3D环境中移动导致视网膜上的投影矢量字段称为光学流。对于线性翻译，这种模式径向对称于A ??的焦点（敌人）对应标题方向。眼睛运动引入扰乱敌人的旋转，遮挡了真正的标题。尽管追求眼球运动，但人类能够感知人类能够感知他们的真实标题。两个策略，大脑可以在旋转的情况下恢复出头包括（i）使用视网膜线索中存在的视觉信息从视觉信息中减去超视网膜速度信号，以根据流动的差异分离转换特性。为了评估每种策略的贡献，我们使用眼睛追踪（真实的追踪，RP）来引入转换流场的旋转或向刺激旋转，模拟固定期间的眼睛追踪（模拟追踪，SP）。 RP和SP产生相同的视网膜刺激，但SP缺乏超视网膜信号。对于两种条件呈现出头刺激（3D点云），同时从短尾型腹部内部区域（VIP）进行细胞外，其具有标题方向调谐和眼睛追踪反应。我们将完整的调谐曲线与水平平面中的翻译进行了比较到RP / SP期间调谐。我们观察到SP的调谐（表示不完全补偿）的稍大的变化比RP，但远小于纯粹的超视网膜策略。本研究介绍了神经证据，以支持视网膜和超视网膜提示的组合，以追求赔偿。我们还观察到RP期间的较大增益场与SP相比，建议增益字段可以编码眼睛旋转的存在。这些增益场可能用于识别视网膜提示中存在的旋转是否是眼球运动的结果或诸如头部运动的另一个源，或者在弯曲路径上移动。

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