Maskers below a tone raise its pitch while maskers above lower it.

Evidence

With some simplification, the following rule can be proposed: partial masking produced by sounds which are lower in frequency than a test tone yields positive pitch shifts, whereas partial-masking sounds higher in frequency than the test tone produce negative pitch shifts. In terms of the corresponding excitation patterns, the pitch of pure tones is shifted away from the spectral slope of the partial-masking sound. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 682

Categorization

• XREF: The pitch-shift-away-from-masker rule echoes how loudness summation and excitation-pattern models treat spectral edges, tying to the broader cochlear excitation-pattern framework of this book.
• corroborated: 2 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 682