Loudness growth of musically complex stimuli

Area of Science:

• Psychoacoustics
• Auditory Perception
• Music Cognition

Background:

• Loudness perception research traditionally uses simple stimuli like pure tones.
• Previous studies show differences in loudness perception between speech and non-speech sounds.
• The role of acoustic variability versus non-acoustic factors in these differences remains unclear.

Purpose of the Study:

• To investigate loudness perception of complex musical stimuli in young adults.
• To compare loudness perception functions for orchestral music with those for pure tones and speech.
• To explore factors influencing loudness judgments beyond acoustic properties.

Main Methods:

• 11 young adults with musical training and experience in magnitude estimation participated.
• Participants judged the loudness of 3 orchestral excerpts (15-25 sec) varying in 5-dB steps over a 35-dB range.
• Excerpts varied in pitch and loudness characteristics.

Main Results:

• Power functions for loudness judgments of orchestral excerpts showed slopes and determination indexes within the typical range for pure tones and white noise.
• These measures significantly differed from those reported for continuous speech stimuli.
• Loudness perception of orchestral music followed similar acoustic principles as non-speech sounds.

Conclusions:

• Acoustic variability alone does not fully explain differences in loudness perception between speech and non-speech stimuli.
• Non-acoustic factors, such as semantic meaning, likely contribute significantly to loudness judgments of speech.
• This suggests a more complex interplay of factors in auditory perception than previously assumed.