Reverberation extends the fusion zone in which reflections merge with the direct sound

Evidence

The threshold curves become more horizontal; the fusion zone is extended in time when the sound is prolonged by reflected energy (repetitions) in the listening space. It was found that reverberation in the program had the same effect. — Toole, Floyd E, Sound reproduction- the acoustics and…, 631

Categorization

• XREF: Links to the earlier audibility-threshold discussion and to how recording/program reverberation masks or extends perception of room reflections.