Effect of Pleasantness and Unpleasantness of Music on the Acceptable Noise Level

Background and Aim: Music can be a favorite, annoying, or even a distracting noise. It is known that the processing of brain hemispheres is affected by the pleasantness/unpleasantness of music, which could be utilized as a signal or noise  in auditory  neuroscience.  By using the Acceptable Noise Level (ANL) test, which is the quantification of noise tolerance while listening to a running speech, we investigated whether the pleasantness/unpleasantness of music affects the ANL results under monotic-listening and dichotic-listening conditions. Methods: Based on the subjective scale scores, pleasant and unpleasant music (10 songs) were selected as alternatives to babble noise or running speech for testing 50 subjects for seven monotic and dichotic listening conditions. Results: While pleasant music changed the ANL significantly under monotic listening conditions, the higher level of babble noise was tolerated, and both characteristics of music pleasantness and unpleasantness changed ANL significantly for various dichotic conditions. The range of the ANL for dichotic conditions is wider than that for monotic conditions. Conclusion: Music can affect the ANL in terms of pleasantness  and  unpleasantness  for both monotic and dichotic listening conditions, with a greater effect on dichotic conditions, indicating the role of hemispheric specification in emotional music processing. Keywords: Acceptable noise level; dichotic listening; monotic listening; noise; brain processing