Categorical loudness scaling tests present eleven labeled response categories as on-screen bars.

Evidence

2.5.3 Fixed-Level Procedure The CLS experimental methods generally followed the ISO standard (Kinkel 2007 ). Stimuli were presented monaurally over Sennheiser Professional HD 25-II headphones in a sound booth. Eleven loudness categories were displayed on a computer monitor as horizontal bars increasing in length from bottom to top. Every other bar between the “Not Heard” and “Too Loud” categories had a descriptive label (i.e., “Soft”, “Medium”, etc.). Participants clicked on the bar that corresponded to their loudness perception. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2543

Categorization

• DEFINE: Explains what the 11-category categorical loudness scaling (CLS) instrument actually looks like and how a participant responds.