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Simultaneous recordings of ocular microtremor and microsaccades with a piezoelectric sensor and a video-oculography system

机译：用压电传感器和视频眼图系统同时录制眼睛微调和微微码的录制

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摘要

Our eyes are in continuous motion. Even when we attempt to fix our gaze, we produce so called “fixational eye movements”, which include microsaccades, drift, and ocular microtremor (OMT). Microsaccades, the largest and fastest type of fixational eye movement, shift the retinal image from several dozen to several hundred photoreceptors and have equivalent physical characteristics to saccades, only on a smaller scale (). OMT occurs simultaneously with drift and is the smallest of the fixational eye movements (∼1 photoreceptor width, >0.5 arcmin), with dominant frequencies ranging from 70 Hz to 103 Hz (). Due to OMT’s small amplitude and high frequency, the most accurate and stringent way to record it is the piezoelectric transduction method. Thus, OMT studies are far rarer than those focusing on microsaccades or drift. Here we conducted simultaneous recordings of OMT and microsaccades with a piezoelectric device and a commercial infrared video tracking system. We set out to determine whether OMT could help to restore perceptually faded targets during attempted fixation, and we also wondered whether the piezoelectric sensor could affect the characteristics of microsaccades. Our results showed that microsaccades, but not OMT, counteracted perceptual fading. We moreover found that the piezoelectric sensor affected microsaccades in a complex way, and that the oculomotor system adjusted to the stress brought on by the sensor by adjusting the magnitudes of microsaccades.
机译：我们的眼睛不停地运动。即使当我们尝试固定视线时，我们也会产生所谓的“注视眼动”，包括微扫视，漂移和眼部微震颤（OMT）。微扫视是眼动的最大，最快的一种，它可以将视网膜图像从几十个感光器转移到数百个，并且具有与扫视镜相同的物理特性，只是规模较小。 OMT与漂移同时发生，并且是固定眼的最小移动（〜1个​​感光体宽度，> 0.5 arcmin），主频范围为70 Hz至103 Hz（）。由于OMT的振幅小且频率高，因此最准确，最严格的记录方法是压电转导法。因此，OMT研究要比专注于微扫视或漂移的研究少得多。在这里，我们使用压电设备和商用红外视频跟踪系统同时记录了OMT和微扫视。我们着手确定OMT是否可以在尝试固定过程中帮助恢复知觉褪色的目标，并且我们还想知道压电传感器是否会影响微扫视的特性。我们的结果表明，微扫视而非OMT可以抵消感知衰落。此外，我们发现压电传感器以复杂的方式影响微扫视，并且动眼系统通过调整微扫视的幅度来适应传感器所施加的应力。

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