Raising intensity lowers pitch at low frequencies but raises it at high frequencies.

Evidence

Low frequency — as the intensity of a stimulus increased, the pitch of a low-frequency tone (shown as the black, filled circles) decreased. • Mid frequency — as the intensity of a stimulus increased, the pitch of a mid-frequency pure tone (e.g., 500–2000 Hz; shown as the unfilled circles)) changed very little. • High frequency — as the intensity of a stimulus increased, the pitch of a high-frequency pure tone (shown as the gray, filled circles) increased. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1252

Categorization

• XREF: This frequency-dependent pitch-intensity interaction echoes the complex direction reversals familiar in auditory psychophysics — comparable to level-dependent loudness growth differences between frequency regions.