Visually Guided Horizontal Saccades under the Double-Step Paradigm

Xiu, Zhai; Enderle, John D.

doi:10.4172/2475-7586.1000113

Cited by 4 publications

(9 citation statements)

References 19 publications

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“…Meanwhile, controlled execution of saccades can suppress re exive saccades under high load condition [4,17]. In addition, programming of secondary saccades is prior to their execution and during latency of initial saccades [23]. Like initial saccades, secondary saccades contribute to target acquisition time and nal eye position [24].…”

Section: Discussionmentioning

confidence: 99%

Eye Movement Indices of Post-Saccadic Task Under Cognitive Load: A Path Analysis to Predict Individual’s Performance

Fadardi

Mahjoob

et al. 2021

Preprint

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Purpose: The evidence on the linear relationship between cognitive load, saccade, fixation, and task performance was uncertain. We tested pathway models for degraded task performance resulting from changes in saccadic and post-saccadic fixation under cognitive load. Methods: Participants' (n = 38) eye movements were recorded using a post-saccadic discrimination task without and with arithmetic operations to impose cognitive load, validated through recording heart rate variability and subjective measurement. Results: Results showed that cognitive load led to longer latencies of saccade and fixation; more inaccurate responses and fewer secondary saccades (P<0.001). Longer saccade latencies influenced task performance indirectly via increases in fixation latency, thereby, longer reaction times and higher response errors were observed due to limited fixation duration on desired target. Conclusion: We suggest that latency and duration of fixation indicate efficiency of information processing and can predict the speed and accuracy of task performance under cognitive load.

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Section: Discussionmentioning

confidence: 99%

Eye Movement Indices of Post-Saccadic Task Under Cognitive Load: A Path Analysis to Predict Individual’s Performance

Fadardi

Mahjoob

et al. 2021

Preprint

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“…In the Ref. [27], an eye tracking device manufactured by SensoMotoric Instruments (SMI) was used for the analysis of saccadic eye movements under a double-step paradigm for ocular analysis. Visual stimuli consist on solid white dots (4 mm in diameter) on a gray background displayed on a screen.…”

Section: Related Workmentioning

confidence: 99%

“…The most frequently used patterns for visual stimulation in patients with neurodegenerative diseases are saccades and smooth pursuit signals [1,27,33].…”

Section: Visual Stimulationmentioning

confidence: 99%

“…The literature provides evidence of the EOG having precision below 2°, and the signal can be considered linear for gaze angles of up to ±30° [1], which means changes in the stimulus cause equal angular increases in the EOG signal. Hence, this value is generally considered the maximum for a saccadic test [1,33,34], and multiple authors choose ±10°a nd ±20°as typical values [27,35,36].…”

Section: Saccadic Stimulimentioning

confidence: 99%

“…Patients who are under a test usually have problems in the oculomotor system, such as high latencies and low saccadic velocity. Regarding this aspect, the literature shows the ranges of these values are between 0.1 Hz and 1.1 Hz, with a resolution of 0.1 Hz [27,34,36], taking typical values for the tests 0.2 Hz and 0.3 Hz. For instance, the stimulus in Figure 2 shows the SSAC stimulus consists of a rectangular pulse train.…”

Section: Saccadic Stimulimentioning

confidence: 99%

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Novel FPGA-Based Visual Stimulation Method for Eye Movement Analysis

et al. 2022

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Several studies have demonstrated that irregularities in eye movements represent an important indicator to diagnose diseases affecting the central nervous system. In fact, abnormal horizontal and vertical eye movements play an important role in measuring the progress of neurodegenerative diseases. Electro-oculography (EOG) is a widespread technique that monitors the horizontal and vertical eye movements in response to a visual stimulation pattern. These visual stimuli require stimulus-response synchronization, low latency, and a real-time response. In this work, a novel system based on a Field-Programmable Gate Array (FPGA) is designed to address hundreds of LEDs for the generation of multiple visual stimulus signals and for EOG acquisition. Our evaluation demonstrates that the proposed system enhances the accuracy of the signals generated, showing excellent results in the stimulus-response synchronism and quality of the stimuli waveform.

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Post-saccadic Eye Movement Indices Under Cognitive Load: A Path Analysis to Determine Visual Performance

Fadardi

Mahjoob

et al. 2022

JOVR

View full text Add to dashboard Cite

Purpose: The evidence on the linear relationship between cognitive load, saccade, fixation, and task performance was uncertain. We tested pathway models for degraded task performance resulting from changes in saccadic and post-saccadic fixation under cognitive load. Methods: Participants’ (n = 38) eye movements were recorded using a post-saccadic discrimination task with and without arithmetic operations to impose cognitive load, validated through recording heart rate variability and subjective measurement. Results: Results showed that cognitive load led to longer latencies of saccade and fixation; more inaccurate responses and fewer secondary saccades (P < 0.001). Longer saccade latencies influenced task performance indirectly via increases in fixation latency, therefore, longer reaction times and higher response errors were observed due to limited fixation duration on desired target. Conclusion: We suggest that latency and duration of fixation indicate efficiency of information processing and can predict the speed and accuracy of task performance under cognitive load.

show abstract

Visually Guided Horizontal Saccades under the Double-Step Paradigm

Cited by 4 publications

References 19 publications

Eye Movement Indices of Post-Saccadic Task Under Cognitive Load: A Path Analysis to Predict Individual’s Performance

Eye Movement Indices of Post-Saccadic Task Under Cognitive Load: A Path Analysis to Predict Individual’s Performance

Novel FPGA-Based Visual Stimulation Method for Eye Movement Analysis

Post-saccadic Eye Movement Indices Under Cognitive Load: A Path Analysis to Determine Visual Performance

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