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Spectral loudness summation and simple reaction time.
Eva Wagner1, Mary Florentine, Søren Buus
1Institute for Hearing, Speech & Language and Department of Speech-Language Pathology & Audiology (106A FR), Northeastern University, Boston, Massachusetts 02115, USA.
The Journal of the Acoustical Society of America
|October 14, 2004
Summary
This study reveals a strong connection between loudness perception and simple reaction time (RT). Reaction time closely mirrors how loud a sound is perceived, not its sensation level.
Area of Science:
- Auditory perception
- Psychoacoustics
- Human factors
Background:
- Loudness summation is known to vary with sound level.
- Previous research has explored the relationship between auditory stimuli and reaction times.
Purpose of the Study:
- To investigate the relationship between perceived loudness and simple reaction time (RT).
- To determine if RT is more closely related to loudness or sensation level across different sound pressure levels (SPL).
Main Methods:
- Loudness matching was performed between narrowband and broadband noise across a wide range of SPLs.
- Simple reaction time (RT) was measured for both noise types at corresponding levels.
- The level difference required for equal loudness and equal RT was analyzed as a function of SPL.
Main Results:
- Loudness summation showed a level-dependent pattern, increasing and then decreasing with SPL.
- Reaction time (RT) data exhibited a similar pattern to loudness, varying with SPL.
- The level difference for equal RT mirrored the pattern for equal loudness, supporting a close relationship.
Conclusions:
- Simple reaction time (RT) is strongly correlated with perceived loudness.
- RT is not dependent on sensation level, as demonstrated by the level-dependent RT patterns.
- These findings support the hypothesis that auditory loudness and simple RT are closely linked phenomena.