An experimental consideration on the definition of a fixation point.

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  • 注視点の定義に関する実験的検討
  • チュウシテン ノ テイギ ニ カンスル ジッケンテキ ケントウ

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Abstract

This study aims to reexamine the former definitions of a fixation point and to propose a new definition of it. One of the former definitions employs velocity of eye movements as its standard. When the actual velocity of the eye movement is kept below the limit velocity of fixation, that is 5deg/s, for a certain period of time, it is regarded as “a fixation”. But when the visual targets were moving rather fast, it is hard to detect fixation points by this definition, even when the subject can be thought to get some information. To reexamine the limit velocity of fixation and solve this problem, two measurements of eye movements were taken. By analysing the data while tracking a moving target and looking at a moving image, it was clarified that the limit velocity of fixation should be defined as about 10deg/s, if the visual targets were moving. The new definition made it possible to detect some fixation points.And the fixation points got from the analysis matched up to the position that subject had reported to have looked at. From above findings, it is suggested that the limit velocity of fixation should be defined with consideration to the velocity of visual targets.

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