Randomly generated tone patterns must avoid repeated equidistant intervals to prevent repeated pitches.

Evidence

Patterns were generated by randomly selecting a set of five intervals, with the restrictions that each interval should only occur once within a pattern, and two intervals with same magnitude but opposite sign should not follow each other immediately in the sequence (to prevent the occurrence of repeated tones in the pattern). — Dijk, Pim van, Physiology, Psychoacoustics and…, 5290

Categorization

• XREF: Relates to stimulus construction constraints in psychophysics, connecting to how melodic patterns avoid pitch repetition artifacts.