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Objective: Distorted loudness perception is one of the main complaints ofhearing aid users. Being able to measure loudness perception correctly in theclinic is essential for fitting hearing aids. For this, experiments in theclinic should be able to reflect and capture loudness perception as ineveryday-life situations. Little research has been done comparing loudnessperception in the field and in the laboratory. Design: Participants rated theloudness in the field and in the laboratory of 36 driving actions done by fourdifferent vehicles. The field measurements were done in a restricted street andrecorded with a 360deg camera and a tetrahedral microphone. The recordedstimuli, which are openly accessible, were presented in three differentconditions in the laboratory: 360deg video recordings with a head-mounteddisplay, video recordings with a desktop monitor, and audio-only. Sample:Thirteen normal-hearing participants and 18 hearing-impaired participantsparticipated in the study. Results: The driving actions were ratedsignificantly louder in the laboratory than in the field for the audio-onlycondition. These loudness rating differences were bigger for louder sounds intwo laboratory conditions, i.e., the higher the sound level of a driving actionwas the more likely it was to be rated louder in the laboratory. There were nosignificant differences in the loudness ratings between the three laboratoryconditions and between groups. Conclusions: The results of this experimentfurther remark the importance of increasing the realism and immersion whenmeasuring loudness in the clinic.

Vehicle Noise: Comparison of Loudness Ratings in the Field and the Laboratory