Multitasking: does task-switching add to the effect of dual-tasking on everyday-like driving behavior?

Area of Science:

• Cognitive Psychology
• Human Factors Engineering
• Transportation Safety

Background:

• Performing multiple tasks simultaneously (dual-tasking) or sequentially (task-switching) is known to impair performance.
• The combined impact of dual-tasking and task-switching within a single scenario remains unclear.
• Understanding these effects is crucial for real-world applications like driving.

Purpose of the Study:

• To investigate whether task-switching exacerbates performance degradation already caused by dual-tasking.
• To examine the additive effects of task-switching on cognitive load during a simulated driving task.
• To determine if switching demands increase processing load beyond dual-tasking alone.

Main Methods:

• A simulated car driving scenario was used with 45 young adults.
• Participants performed driving while concurrently typing or arguing in response to stimuli.
• Tasks were presented in repetitive (dual-tasking only) or intermixed (dual-tasking with task-switching) conditions.

Main Results:

• Driving performance, measured by lateral lane position variability, improved in the repetitive condition compared to the switching condition during the typing task.
• No significant differences were found for other driving metrics or the arguing task.
• Reaction times for secondary tasks did not show significant differences between conditions.

Conclusions:

• Task-switching provides limited evidence for adding to the performance challenges of dual-tasking in this driving context.
• Dual-tasking alone may already impose substantial processing demands, leaving little room for additional load from switching.
• Future research should explore different task combinations and complexity levels.