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time variance of psychoacoustics parameters

Dear list,
Is there any known model to calculate Zwicker's parameters (Sharpness, Roughness, Fluctuation Strength) if the masking patterns or the specific loudness (N'(z)) depend not only on the critical band (z) but on time.
Several authors reported time independent values of Zwicker's parameters although the noise signals described therein seem to be time dependent e.g. the modulation frequency or masking depth ΔL varies throughout time. Up to now, I didn't find how they carry out this stage. Is it just an average? I don't think so at first glance

Thanks in advance,