Fig. 3. EEGs involved in gender distinction. The CHAID decision classification tree analysis was applied to identify gender distinctions in EEG signals from two channels. (A) EEG signals in response to the NS were target variables, but these were not included in the decision tree model. (B) EEG signals in response to scene 1, scene 2, and scene 3 (S1, S2, and S3, respectively) were target variables. The following four variables were used for grouping the decision tree model: the β signal in the F8 channel and the γ signal in the Fp2 channel in response to scene 1, and the α signal in the Fp2 channel, and the θ signal in the F8 channel, in response to scene 2. The model included a total of 10 nodes with six terminal nodes (number 3, 4, 5, 7, 8, and 9). Values for p, chi-squared, and the df are shown in each node. The sample size comprised 84 participants, of whom 36 were men and 48 were women. Variables reaching a significance value of p<0.1 were included in the model.
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