Comparison of magnitude estimation and interval scaling of loudness.
To identify whether equal-appearing interval or magnitude estimation scaling 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 speech, presented randomly at intensities of 5 to 90 dB SPL. In Task 2 subjects used magnitude estimation scaling to rate these stimuli, presented in a randomized order. Analysis showed significantly high correlations for both scaling methods and the stimuli (Spearman rho = 1.00 and .99, respectively). Subjects can use either form of scaling to rate changes in loudness.
McColl
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School of Hearing and Speech Sciences, Ohio University, Athens 45701, USA.
Fucci
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D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D006801:Humans; D008144:Loudness Perception; D011571:Psychoacoustics; D011897:Random Allocation; D013067:Speech Perception