Visual cues are required for loudness constancy to appear

Evidence

Epstein and Florentine ( 2009 , 2012 ) conducted similar tests, but using standard loudness estimation procedures and speech (spondees) either with or without accompanying video of the speaker’s face. They also observed loudness constancy, but only when using the audiovisual presentation. Their tentative conclusion was that loudness constancy may only occur using stimuli of relatively high ecological validity. — Dijk, Pim van, Physiology, Psychoacoustics and…, 1526

Categorization

• QUESTION: Does the visual need reflect cognitive binding of auditory source identity rather than any acoustical property? Would a static face suffice or must it be speaking?