The extent to which the preparation of an eye movement and spatial attention both independently influence performance within the same task has long been debated. In a recent study that combined computational modelling with a dual-task, both saccade preparation and spatial cueing were revealed to separately contribute to the discrimination of targets oriented along the cardinal axis (horizontal and vertical). However, it remains to be seen whether and to what degree the same holds true when different perceptual stimuli are used. In the present study, we combined evidence accumulation modelling with a dual-task paradigm to assess the extent to which both saccade preparation and spatial attention contribute to the discrimination of full contrast targets oriented along the oblique axis (diagonal). The results revealed a separate and quantifiable contribution of both types of orienting to discrimination performance. Comparison of the magnitude of these effects to those obtained for cardinal orientation discrimination revealed the influence of saccade preparation and spatial attention to be six times smaller for oblique orientations. Importantly, the results revealed a separate and quantifiable contribution of both saccade preparation and spatial attention regardless of perceptual stimuli or stimulus contrast.

中文翻译：

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空间注意和扫视准备都独立地有助于区分斜向。

长期以来，人们一直在争论眼睛运动的准备和空间注意力都在多大程度上独立影响同一任务中的性能。在一项将计算模型与双重任务相结合的最新研究中，扫视准备和空间提示均被发现分别有助于区分沿基轴（水平和垂直）定向的目标。然而，当使用不同的知觉刺激时，是否成立以及在多大程度上成立，还有待观察。在本研究中，我们将证据积累模型与双任务范式相结合，以评估扫视准备和空间注意力在多大程度上有助于区分沿斜轴（对角线）定向的完全对比目标。结果揭示了两种类型的定向对歧视表现的单独和可量化的贡献。将这些效果的大小与通过基本方向辨别获得的效果进行比较后，发现斜向扫视准备和空间注意力的影响要小六倍。重要的是，结果表明，无论感知刺激或刺激对比如何，扫视准备和空间注意力都是独立且可量化的。