Saccadic peak velocity increases in a stereotyped manner with the amplitude of eye movements. This relationship, known as the main sequence, has classically been considered to be fixed, although several recent studies have demonstrated that velocity can be modulated to some extent by external incentives. However, the ability to voluntarily control saccadic velocity and its association with motivation has yet to be investigated. Here, in three separate experimental paradigms, we measured the effects of incentivisation on saccadic velocity, reaction time and preparatory pupillary changes in 53 young healthy participants. In addition, the ability to voluntarily modulate saccadic velocity with and without incentivisation was assessed. Participants varied in their ability to increase and decrease the velocity of their saccades when instructed to do so. This effect correlated with motivation level across participants, and was further modulated by addition of monetary reward and avoidance of loss. The findings show that a degree of voluntary control of saccadic velocity is possible in some individuals, and that the ability to modulate peak velocity is associated with intrinsic levels of motivation.

中文翻译：

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扫视峰值速度的自愿调节与个体动机差异相关。


扫视峰值速度以固定方式随着眼球运动的幅度而增加。这种关系被称为主序列，传统上被认为是固定的，尽管最近的几项研究表明，速度可以在某种程度上通过外部激励进行调节。然而，自主控制扫视速度的能力及其与动机的关系仍有待研究。在这里，我们在三个独立的实验范式中测量了激励对 53 名年轻健康参与者的眼跳速度、反应时间和预备性瞳孔变化的影响。此外，还评估了有或没有激励的情况下自愿调节扫视速度的能力。当被指示这样做时，参与者增加和减少眼跳速度的能力各不相同。这种效应与参与者的动机水平相关，并通过增加金钱奖励和避免损失来进一步调节。研究结果表明，某些个体可以对扫视速度进行一定程度的自愿控制，并且调节峰值速度的能力与内在动机水平相关。