Dual task performance in normal aging: a comparison of choice reaction time tasks

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Factors

Background:

• Dual tasking, performing two tasks simultaneously, is crucial for daily activities.
• Cognitive aging research often investigates age-related differences in attention and executive functions.

Purpose of the Study:

• To compare dual task performance between younger and older adults.
• To investigate how task complexity and difficulty affect dual task costs in different age groups.

Main Methods:

• Participants: 28 younger adults (18-30 years) and 28 older adults (>60 years).
• Tasks: Two sets of choice reaction time (RT) tasks (simple and complex) paired with digit span tasks (forward and backward), with easy and hard conditions.
• Procedure: Participants performed all task combinations within each set.

Main Results:

• Older adults were slower but equally accurate on simple dual tasks, while less accurate but equally fast on complex dual tasks compared to younger adults.
• Increased task difficulty (both simple and complex) led to decreased RT and increased error rates across both age groups.
• Dual task costs for error rates were higher in older adults for simple tasks, but higher in younger adults for complex tasks.

Conclusions:

• Younger and older adults may employ different behavioral strategies when faced with dual tasks.
• Task complexity and difficulty significantly influence age-related differences in dual task performance.
• Findings highlight the nuanced impact of aging on cognitive control and executive functions during dual-tasking scenarios.