Loudness as perception can never be directly measured physiologically

Evidence

Although physiological measures will never be able to measure loudness, as loudness is a perception, physiological measurements are crucial for understanding the auditory mechanisms that ultimately lead to loudness. Coupling psychophysical with physiological measurements can facilitate our understanding of loudness perception. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 687

Categorization

• XREF: connects to: Physical sound measurement cannot capture the subjective semantic meaning of a sonic environment — Almo Farina, Soundscape Ecology: Principles,…, 1159