Traffic Noise at Moderate Levels Affects Cognitive Performance: Do Distance-Induced Temporal Changes Matter?

Area of Science:

• Environmental Psychology
• Acoustics
• Human Factors Engineering

Background:

• Urbanization increases housing demand, often leading to construction near roadways.
• Existing sound regulations may not adequately address temporal sound structure variations with changing road proximity.
• Investigating the impact of these temporal sound changes on human cognition is crucial.

Purpose of the Study:

• To assess the effects of varying road traffic noise temporal structures on subjective workload and cognitive performance.
• To determine if differences in sound time structure, at equivalent sound pressure levels, influence human responses.
• To evaluate participants' preferred acoustic environments for focused work.

Main Methods:

• 42 participants completed cognitive tests (Continuous Performance Test) and workload assessments (NASA-TLX).
• Sound conditions included close traffic, far traffic (both at LAeq≈40 dB), and silence.
• A questionnaire gathered data on preferred acoustic environments for concentration.

Main Results:

• Significant differences in workload and cognitive errors were observed across sound conditions.
• No significant performance differences were found between close and far traffic noise conditions.
• Both noise conditions significantly differed from silence, indicating noise impacts performance and workload.

Conclusions:

• Moderate traffic noise levels demonstrably influence cognitive performance and perceived workload.
• The study's methods were insufficient to detect potential human response variations to different temporal sound structures at constant LAeq.
• Further research with refined methodologies is needed to explore nuanced responses to traffic noise temporal characteristics.