Alexithymia, Reward Sensitivity and Internet Addiction Symptoms: Potential Roles of Frontal Lobe Dysfunction and Negative Mood.

The (transformed) DASS‐21 negative mood index was entered in the last step and explained 14% of additional variance, Δ F (1, 300) = 87.49, p < 0.001; DASS‐21 was significantly positively associated with IA symptoms, while Executive Dysfunction, age and gender—but not SR—remained significant, and Apathy now showed a weak, marginally significant ( p = 0.03) negative relationship to IAT scores as an apparent suppressor variable effect.

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Hierarchical regression controlling for demographic variables accounted for 52% of variance in IA symptoms; reward sensitivity, negative mood, and executive dysfunction were highly significant in the final model.

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