Impact of speech presentation level on cognitive task performance: implications for auditory display design.

Area of Science:

• Human-Computer Interaction
• Cognitive Psychology
• Human Factors Engineering

Background:

• Speech displays are common in high-workload environments like aviation and emergency services.
• Optimal speech intelligibility ranges are known, but effects of presentation level variations within this range on cognition are unexplored.
• Simultaneous visual and manual tasks are characteristic of these complex operational settings.

Purpose of the Study:

• To investigate how variations in speech presentation levels affect attentional resources and cognitive processing.
• To determine the impact of presentation level on sentence-processing errors and reaction times in high-workload scenarios.

Main Methods:

• An experimental investigation was conducted with participants performing high-workload tasks.
• Speech presentation levels were varied within the established optimum range for intelligibility.
• Sentence-processing errors and reaction times were measured as key performance indicators.

Main Results:

• Increasing presentation level within the optimum range led to fewer sentence-processing errors.
• Participants generally responded faster as presentation level increased.
• Processing errors were more sensitive to changes in presentation level than reaction time.

Conclusions:

• Speech presentation level is a critical factor influencing cognitive performance in high-workload environments.
• Optimizing speech display volume can reduce errors and improve response speed.
• Findings inform the design of speech communication systems for complex multi-task environments.