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JACIII Vol.28 No.3 pp. 502-510
doi: 10.20965/jaciii.2024.p0502
(2024)

Research Paper:

Effect of Different Measurement Tasks on the Frequency of Microsaccades

Toumi Ohara and Fumiya Kinoshita ORCID Icon

Electrical and Computer Engineering, Graduate School of Engineering, Toyama Prefectural University
5180 Kurokawa, Imizu, Toyama 939-0398, Japan

Corresponding author

Received:
September 28, 2023
Accepted:
November 23, 2023
Published:
May 20, 2024
Keywords:
covert attention, fixational eye movement, microsaccades, interval of occurrence, gaze point
Abstract

In recent years, several attempts have been made to quantitatively evaluate covert attention using microsaccades. However, several unclear aspects exist regarding the measurement method of microsaccades, and a unified analysis method does not exist. Therefore, the current status is such that the interpretation of the results is divided among the research groups. To address this problem, empirical studies on microsaccades must be accumulated and measured and evaluated using a unified method. Therefore, in this study, to accumulate empirical studies on microsaccades, an experiment was conducted to investigate the effect of the presence or absence of gazing at a fixation point on the interval of occurrence of microsaccades in a measurement task. The participants were 15 healthy young people, and we compared the following two types of measurement tasks. Task-I: The participants freely visually searched a white wall 1 m away for 120 s. Task-II: The participants gazed at a fixation point located 1 m ahead at eye level for 120 s. For the microsaccade detection algorithm, we adopted a method imitating the EK method proposed by Engbert and Kliegl in 2003, divided 120 s of time-series data and analyzed it every 2 s, and subsequently evaluated the time-series data for the entire 120 s by concatenating them. Consequently, the interval of occurrence of microsaccades during Task-II decreased by more than 1 Hz compared with that of Task-I (p<0.05). The study confirmed that the presence or absence of gazing at the fixation point during microsaccade measurement affected the interval of occurrence of microsaccades.

Eye movement over 2 s (velocity coordinate)

Eye movement over 2 s (velocity coordinate)

Cite this article as:
T. Ohara and F. Kinoshita, “Effect of Different Measurement Tasks on the Frequency of Microsaccades,” J. Adv. Comput. Intell. Intell. Inform., Vol.28 No.3, pp. 502-510, 2024.
Data files:
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Last updated on Jul. 12, 2024