Brain regions involved in saccadic eye movements partially overlap with a frontoparietal network implicated in encoding numerosities. Eye movement patterns may plausibly reflect strategic scanning behaviours to resolve the open-ended task of efficiently enumerating visual arrays. If so, these patterns may help explain individual differences in enumeration acuity in terms of well-understood visual attention mechanisms. Most enumeration eye-tracking paradigms, however, do not allow for direct manipulation of eye movement behaviours to test these claims. In the current study we terminated trials after a specified number of saccades to systematically probe the time course of enumeration strategies. Fifteen adults (11 naïve, 4 informed) enumerated random dot arrays under three conditions: (1) a novel saccade-terminated design where arrays were visible until one, two or four saccades had occurred; (2) a duration-terminated design where arrays were shown for 250, 500 or 1000 ms; and (3) a response-terminated design where arrays were visible until a response. Participants gave more accurate responses when enumerating saccade-terminated trials despite taking a similar time as in the duration-terminated trials. When participants were informed how trials would terminate, their saccade onset latencies shifted to match task demands. Rotating saccade vectors to align with salient image locations accounted for variability in the orientation of saccade trajectories. These findings (1) show a combination of stimulus-derived visual processing and task-based strategic demands account for enumeration eye movements patterns, (2) validate a novel saccade-contingent trial termination procedure for studying sequences of enumeration eye movements, and (3) highlight the need to include analyses of spatial and temporal eye movement patterns into models of visual enumeration strategies.

中文翻译：

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扫视终止眼动追踪揭示了枚举策略的差异。

涉及眼跳运动的大脑区域与涉及编码数字的额叶前额网络部分重叠。眼睛的运动模式可以合理地反映战略扫描行为，以解决有效枚举视觉阵列的开放式任务。如果是这样的话，这些模式可以帮助您根据公认的视觉注意机制来解释列举能力的个体差异。但是，大多数枚举眼动追踪范例都不允许直接操纵眼动行为来检验这些主张。在当前的研究中，我们在指定次数的扫视之后终止了试验，以系统地探查枚举策略的时间过程。15个成年人（11个天真，4个被告知）在三种情况下枚举了随机点阵列：（1）一种新颖的扫视终止设计，其中的阵列可见，直到出现一个，两个或四个扫视；（2）持续时间终止的设计，其中的数组显示为250、500或1000 ms；（3）响应终止的设计，其中的阵列可见直到响应。尽管枚举终止的试验时间与终止试验的时间相似，但参加者在进行扫视终止的试验时给出了更准确的答复。当参与者被告知试验将如何终止时，他们的扫视发作潜伏期会发生变化，以适应任务需求。旋转扫视向量以与显着图像位置对齐，可解决扫视轨迹方向的变化。这些发现（1）表明，刺激性视觉处理与基于任务的战略需求相结合，可以列举出眼球运动的规律，