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Electroencephalogram slowing by H2S exposure. Relative spectral power across δ (1–4 Hz), θ (4–8 Hz), α (8–12 Hz), and β (12–30 Hz) bins. Compared with wakefulness (black bars), H2S (green bars), isoflurane (ISO; purple bars), and sevoflurane (SEVO; yellow bars) all induce significant increases in δ power. Two-way ANOVA with Bonferroni post-tests: ★, p < 0.05; ★★, p < 0.01; ★★★, p < 0.001, significance compared with wakefulness (oriented vertically).
