Perception and task performance under two simulated office background noise conditions

Abstract

The acoustics of an open-office environment play an important role in people’s working performance. This study was conducted to investigate how task performance is affected by two simulated office noise environments: (1) recorded HVAC noise and (2) a series of intermittent noises, e.g., conversations, phone ringing, etc. These conditions were reproduced over a 32-loudspeaker array in an anechoic chamber to include realistic spatial placement of sound sources. Each subject was seated at the center of the array and asked to perform five cognitive tasks to evaluate effects on memory, reasoning, planning, and attention. The tasks were digit span, grammatical reasoning, tower of London, attention network test, and mental arithmetic. After each noise condition, the participants rated several items including annoyance and perceived performance. Heart rate variability (HRV) was also recorded using ECG sensors as a physiological measure of arousal. Baseline measurements were first obtained in silence, followed by a task training set in silence, and an actual test set in silence. A statistical analysis was used to investigate possible correlations between the acoustic conditions and the cognitive task results, perceptual ratings, and HRV data, respectively. Study details and the findings will be presented.