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首页> 外文期刊>The European Journal of Neuroscience >Cognitive regulation of saccadic velocity by reward prospect
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Cognitive regulation of saccadic velocity by reward prospect

机译：奖励前景对跳动速度的认知调控

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It is known that expectation of reward speeds up saccades. Past studies have also shown the presence of a saccadic velocity bias in the orbit, resulting from a biomechanical regulation over varying eccentricities. Nevertheless, whether and how reward expectation interacts with the biomechanical regulation of saccadic velocities over varying eccentricities remains unknown. We addressed this question by conducting a visually guided double-step saccade task. The role of reward expectation was tested in monkeys performing two consecutive horizontal saccades, one associated with reward prospect and the other not. To adequately assess saccadic velocity and avoid adaptation, we systematically varied initial eye positions, saccadic directions and amplitudes. Our results confirmed the existence of a velocity bias in the orbit, i. e., saccadic peak velocity decreased linearly as the initial eye position deviated in the direction of the saccade. The slope of this bias increased as saccadic amplitudes increased. Nevertheless, reward prospect facilitated velocity to a greater extent for saccades away from than for saccades toward the orbital centre, rendering an overall reduction in the velocity bias. The rate (slope) and magnitude (intercept) of reward modulation over this velocity bias were linearly correlated with amplitudes, similar to the amplitude-modulated velocity bias without reward prospect, which presumably resulted from a biomechanical regulation. Small-amplitude (<= 5 degrees) saccades received little modulation. These findings together suggest that reward expectation modulated saccadic velocity not as an additive signal but as a facilitating mechanism that interacted with the biomechanical regulation.
机译：众所周知，对奖励的期望会加快扫视速度。过去的研究还表明，由于对不同偏心率进行生物力学调节，因此在轨道上存在扫掠速度偏差。然而，在不同的偏心率上，奖励期望是否以及如何与声速的生物力学调节相互作用尚不清楚。我们通过视觉引导的双步扫视任务解决了这个问题。在连续两次水平扫视的猴子中测试了奖励期望的作用，其中一只与奖励前景相关，另一只则没有。为了充分评估眼跳速度并避免适应，我们系统地改变了初始眼睛的位置，眼跳方向和幅度。我们的结果证实了在轨道上存在速度偏差，即。例如，随着初始眼睛位置沿扫视方向偏离，扫视峰值速度线性下降。该偏置的斜率随着拍音幅度的增加而增加。然而，与向轨道中心的扫视相比，奖励远景在更大的程度上促进了扫视远离轨道的速度，从而总体上降低了速度偏差。在此速度偏差上，奖励调制的速率（斜率）和幅度（截距）与幅度线性相关，类似于没有奖励前景的幅度调制速度偏差，这大概是由于生物力学调节造成的。小幅度（<= 5度）扫视几乎没有调制。这些发现共同表明，奖励期望调制的跳动速度不是作为附加信号，而是作为与生物力学调节相互作用的促进机制。

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