Loudness perception of signals of monotonically changing sound pressure

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Abstract
Listeners (human) were required to judge whether a 500-Hz stimulus, whose SPL [sound pressure level] was monotonically changing (increasing or decreasing over its 2-s duration). Performance was best when single stimuli were presented in isolation. Providing a 2nd, fixed SPL stimulus as a reference resulted in poorer performance especially as the initial SPL of the changing stimulus departed from that of the reference. It made little difference whether the variable was presented before or after the reference stimulus. Under optimal conditions listeners could discern changes as small as 0.25 dB/s 75% of the time. The traditional differential threshold for stimuli whose SPL was not changing was 0.37 dB.

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