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Average cochleogram obtained from (a) the 14 week rats, (b) the 24 week rats. Animals have the same weight (345g) but different age : 14 vs. 24 weeks old. Styrene exposure : 700 ppm, 6 h/d, 5 d/w, 4 w. Abscissa - upper trace: length (mm) of the entire spiral course of the organ of Corti from the bottom of the hook. - lower trace : frequency-map according to Müller (1991). Ordinate: hair cell loss in percent. IHC: inner hair cells; OHC1: first row of outer hair cells; OHC2: second row; OHC3.

Average cochleogram obtained from (a) the 14 week rats, (b) the 24 week rats. Animals have
the same weight (345g) but different age : 14 vs. 24 weeks old. Styrene exposure : 700 ppm, 6 h/d, 5 d/w,
4 w. Abscissa - upper trace: length (mm) of the entire spiral course of the organ of Corti from the
bottom of the hook. - lower trace : frequency-map according to Müller (1991). Ordinate: hair cell loss
in percent. IHC: inner hair cells; OHC1: first row of outer hair cells; OHC2: second row; OHC3.