Comparison of magnitude estimation and interval scaling of loudness

To identify whether equal-appearing interval or magnitude estimation scalin g resulted in a data set with a closer correlation to the physical stimuli involved 20 young adults completing two tasks. In Task 1 subjects used a 7- point equal-appearing interval loudness of 18 10-sec. samples of babble spe ech, presented randomly at intensities of 5 to 90 dB SPL. Ln Task 2 subject s used magnitude estimation scaling to rate these stimuli, presented in a r andomized order. Analysis showed significantly high correlations for Loth s caling methods and the stimuli (Spearman rho=1.00 and .99, respectively). S ubjects can use either form of scaling to rare changes in loudness.