Visual grouping under isoluminant condition: impact of mental fatigue

Tatjana Pladere; Diana Bete; Jurgis Skilters; Gunta Krumina

doi:10.1117/12.2236516

28 September 2016 Visual grouping under isoluminant condition: impact of mental fatigue

Tatjana Pladere, Diana Bete, Jurgis Skilters, Gunta Krumina

Proceedings Volume 9971, Applications of Digital Image Processing XXXIX; 997133 (2016) https://doi.org/10.1117/12.2236516
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

Instead of selecting arbitrary elements our visual perception prefers only certain grouping of information. There is ample evidence that the visual attention and perception is substantially impaired in the presence of mental fatigue. The question is how visual grouping, which can be considered a bottom-up controlled neuronal gain mechanism, is influenced. The main purpose of our study is to determine the influence of mental fatigue on visual grouping of definite information – color and configuration of stimuli in the psychophysical experiment. Individuals provided subjective data by filling in the questionnaire about their health and general feeling. The objective evidence was obtained in the specially designed visual search task were achromatic and chromatic isoluminant stimuli were used in order to avoid so called pop-out effect due to differences in light intensity. Each individual was instructed to define the symbols with aperture in the same direction in four tasks. The color component differed in the visual search tasks according to the goals of study. The results reveal that visual grouping is completed faster when visual stimuli have the same color and aperture direction. The shortest reaction time is in the evening. What is more, the results of reaction time suggest that the analysis of two grouping processes compete for selective attention in the visual system when similarity in color conflicts with similarity in configuration of stimuli. The described effect increases significantly in the presence of mental fatigue. But it does not have strong influence on the accuracy of task accomplishment.

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Tatjana Pladere, Diana Bete, Jurgis Skilters, and Gunta Krumina "Visual grouping under isoluminant condition: impact of mental fatigue", Proc. SPIE 9971, Applications of Digital Image Processing XXXIX, 997133 (28 September 2016); https://doi.org/10.1117/12.2236516

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KEYWORDS

Visualization

Information visualization

Colorimetry

Target detection

Visual analytics

Data processing

Visual system

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