Fixational saccade inhibition and pupil dilation during self-paced limb movement preparation

Fixational saccades are modulated in anticipation of several kinds of stimuli and motor actions, suggesting that they can form an overt marker of preparatory state. However, no existing work has studied fixational saccades ahead of spontaneous limb movements in the absence of sensory stimuli, in order to isolate motor preparation from other anticipatory processes (e.g., those related to stimulus processing). Here we examined fixational saccades while participants made self-paced hand and foot movements. We observed that fixational saccade rate steadily dropped prior to either kind of motor action, and recovered immediately after. To examine the relation between this fixational saccade rate signal and other known signals that precede volitional action, we analyzed how this signal related to anticipatory pupil size changes in the same dataset. Replicating previous work, we found steady pupil dilation ahead of limb movements, followed by rapid re-constriction. The amplitude of this pupil s..., , # Data from: Fixational saccade inhibition and pupil dilation during self-paced limb movement preparation Dataset DOI: [10.5061/dryad.mcvdnckbv](10.5061/dryad.mcvdnckbv) ## Description of the data and file structure These are eye tracking and key press records from an experiment during which human participants engaged in spontaneous key presses (spacebar or foot pedal). ### Files and variables #### File: Archive.zip **Description:**Â The archive contains, for each of 120 participants, 4 files for each of 2 experiment sessions. The file names are formatted like this: \[participant number]M[session number]_[kind of data].npy The [kind of data] string can be the following: derivative_cleaned: time series data of preprocessed temporal derivative of pupil size, in mm / s on a time axis defined in mm. foot: time stamps of foot presses, on the same mm time axis as derivative_cleaned. saccades: time stamps of saccades, on the same mm time axis as derivative_cleaned. space: time stamp..., We received explicit consent from our participants to publish the de-identified data in the public domain. The data contain no identifying features of the participants: just anonymized eye tracking and key press records.固视眼跳（Fixational saccades）会在多种刺激与运动动作的预期过程中受到调控，提示其可作为准备状态的显性标记。然而，现有研究尚未在排除感觉刺激的前提下，探究自发性肢体运动前的固视眼跳变化，以将运动准备过程与其他预期过程（例如与刺激处理相关的过程）相分离。本研究在受试者完成自定节奏的手部与足部动作时，对固视眼跳进行了观测。我们发现，两类运动动作发生前，固视眼跳的频率均持续下降，并在动作结束后即刻恢复。为探究该固视眼跳频率信号与已知的自主运动前信号之间的关联，我们分析了该信号与同数据集内的预期性瞳孔尺寸变化的关系。本研究重复了此前的研究结果：肢体运动前会出现持续的瞳孔扩张，随后伴随快速的瞳孔收缩。该瞳孔振幅…… # 数据集来源：自定节奏肢体运动准备阶段的固视眼跳抑制与瞳孔扩张 数据集DOI：[10.5061/dryad.mcvdnckbv] ## 数据与文件结构说明 本数据集包含人类受试者在自发性按键（空格键或脚踏板）实验中获取的眼动追踪与按键记录。 ### 文件：Archive.zip **描述：** 该压缩包包含120名受试者的实验数据，每名受试者在两次实验阶段中各生成4个文件。文件命名格式如下： `[受试者编号]M[实验阶段编号]_[数据类型].npy` 其中`[数据类型]`字段可选值如下： - derivative_cleaned：预处理后的瞳孔尺寸时间导数序列数据，单位为毫米/秒，时间轴以毫米为单位定义； - foot：足部按键的时间戳，时间轴与derivative_cleaned一致； - saccades：眼跳事件的时间戳，时间轴与derivative_cleaned一致； - space：按键时间戳…… 我们已获得受试者的明确知情同意，可将去标识化后的数据集公开发布至公共领域。本数据集不含任何受试者的身份识别信息，仅包含匿名化的眼动追踪与按键记录。