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Figure 1. Overview of the experimental procedure. Horizontal bars: exposure group I (top), exposure group II (bottom). Cross-striated area: Toluene exposure (6 h/d, 10 d). Squared area: Combined toluene and noise exposure (toluene 6 h/d + noise 2 h/d, 10 d). Black area: Noise exposure (4 h). AT1-4: Test of auditory thresholds

Figure 1. Overview of the experimental procedure. Horizontal bars: exposure group I (top), exposure
group II (bottom). Cross-striated area: Toluene exposure (6 h/d, 10 d). Squared area: Combined
toluene and noise exposure (toluene 6 h/d + noise 2 h/d, 10 d). Black area: Noise exposure (4 h). AT1-4:
Test of auditory thresholds