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. 2022 Nov 4;22(21):8484.
doi: 10.3390/s22218484.

An "Instantaneous" Response of a Human Visual System to Hue: An EEG-Based Study

Gleb V Tcheslavski  1 , Maryam Vasefi  2
Affiliations

An "Instantaneous" Response of a Human Visual System to Hue: An EEG-Based Study

Gleb V Tcheslavski et al. Sensors (Basel). .

Abstract

(1) The article presents a new technique to interpret biomedical data (EEG) to assess cortical responses to continuous color/hue variations. We propose an alternative approach to analyze EEG activity evoked by visual stimulation. This approach may augment the traditional VEP analysis. (2) Considering ensembles of EEG epochs as multidimensional spatial vectors evolving over time (rather than collections of time-domain signals) and evaluating the similarity between such vectors across different EEG epochs may result in a more accurate detection of colors that evoke greater responses of the visual system. To demonstrate its suitability, the developed analysis technique was applied to the EEG data that we previously collected from 19 participants with normal color vision, while exposing them to stimuli of continuously varying hue. (3) Orange/yellow and dark blue/violet colors generally aroused better-pronounced cortical responses. The selection of EEG channels allowed for assessing the activity that predominantly originates from specific cortical regions. With such channel selection, the strongest response to the hue was observed from Parieto-Temporal region of the right hemisphere. The statistical test-Kruskal-Wallis one-way analysis of variance-indicates that the distance evaluated for spatial EEG vectors at different post-stimulus latencies generally originate from different statistical distributions with a probability exceeding 99.9% (α = 0.001).

Keywords: EEG analysis; EEG spatial vectors; Kruskal–Wallis test; response to solid color changing over time; similarity between multidimensional vectors.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Time course of the color presentation for “1-s”, “3-s”, “5-s”, and “15-s” stimuli.
Figure 2
Figure 2
The structure of the set of EEG epochs corresponding to the specific stimulus.
Figure 3
Figure 3
Visual evoked potentials for the “1-s”, “3-s”, and “5-s” stimuli and Oz (a), POz (b), and Cz (c) EEG channels.
Figure 4
Figure 4
Distance averaged over 10 EEG epochs (one arbitrarily selected participant, single-trial, and “5-s” stimuli) and over 10 sets of synthetic data.
Figure 5
Figure 5
Distance averaged over 19 participants, 2 trials per participant, and all EEG channels and epochs as a function of post-stimulation latency.
Figure 6
Figure 6
Distance averaged over 19 participants, 2 trials per participant, and all EEG channels as a function of stimulation color.
Figure 7
Figure 7
Average distance evaluated for male (a) and female (b) participants and for all EEG channels as a function of stimulation color.
Figure 8
Figure 8
Average distance evaluated for the male participants and for Occipital (a), Parieto-Temporal (b), and Frontal (c) EEG channels as a function of stimulation color.
Figure 9
Figure 9
Average distance evaluated for the male participants and for the left (a) and right (b) Parieto-Temporal EEG channels as a function of stimulation color.
Figure 10
Figure 10
Histograms approximating the shape of sample distributions of the distance evaluated for spatial EEG vectors corresponding to the three color stimuli.
Figure 11
Figure 11
Average distance (blue) and H-values (red) evaluated for male participants and for all EEG channels as a function of post-stimulation latency.
Figure 12
Figure 12
H-values evaluated for the male participants and for all EEG channels as functions of stimulation color.
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