Binaural audio without visuals and head tracking stays internalized in the head

Evidence

In contrast to the last example in the previous section, listening to binaural audio without supporting visuals and head movement correlations is not a credible experience. Sounds are perceived to be inside, behind or close to the head. Well-synchronized head tracking, which keeps the sound images stable as the head moves, is a major improvement to externalization, but the visual information is incompatible. — Toole, Floyd E, Sound reproduction- the acoustics and…, 301

Categorization

• XREF: Directly connects with the reader’s psychoacoustics interest in externalization cues and head-tracking in modern binaural listening products. — connects to: Headphones sound ‘in the head’ because they fail to model head movement cues — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 735
• CANDY: Neat everyday conversation fact: why binaural audio sounds ‘inside your head’ without head tracking.