From eyes’ microtremors to critical flicker fusion
Pedro Lencastre, Rujeena Mathema, Pedro G. Lind
TL;DR
This paper explores how eye microtremors relate to the critical flicker fusion threshold, a measure of visual perception that can indicate health conditions.
Contribution
The study introduces a novel method to predict individual CFFT ranges using eye microtremor frequencies with high accuracy.
Findings
Individual differences in CFFT can be explained by eye microtremors.
A classifier based on microtremor frequencies predicts CFFT ranges with 85% accuracy at 60 Hz and 88% at 120 Hz.
Abstract
The critical flicker fusion threshold (CFFT) is the frequency at which a flickering light source becomes indistinguishable from continuous light. The CFFT is an important biomarker of health conditions, such as Alzheimer’s disease and epilepsy, and is affected by factors as diverse as fatigue, drug consumption, and oxygen pressure, which make CFFT individual- and context-specific. Other causal factors beyond such biophysical processes are still to be uncovered. We investigate the connection between CFFT and specific eye-movements, called microtremors, which are small oscillatory gaze movements during fixation periods. We present evidence that individual differences in CFFT can be accounted by microtremors, and design an experiment, using a high-frequency monitor and recording the participant’s eye-movements with an eye-tracker device, which enables to measure the range of frequencies of…
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Taxonomy
TopicsEEG and Brain-Computer Interfaces · Vestibular and auditory disorders · Neuroscience and Neural Engineering