Posture and cognition interfere in later adulthood even without concurrent response production.

Area of Science:

• Cognitive Neuroscience
• Aging Research
• Motor Control

Background:

• Dual-task interference is a common finding in aging research, impacting performance across various cognitive and motor domains.
• Previous studies often used concurrent response production or did not individually adjust cognitive task difficulty, potentially confounding results.
• Understanding age-related changes in dual-tasking is crucial for maintaining functional independence in older adults.

Purpose of the Study:

• To investigate age differences in dual-task costs within cognitive-sensorimotor settings.
• To examine these costs without concurrent response production and with individually adjusted cognitive task demands.
• To explore how dual-tasking affects postural control in young and older adults.

Main Methods:

• Twenty-four young and 23 older adults performed a cognitive task and two postural control tasks (stable and moving platform) in single- and dual-task conditions.
• Cognitive task difficulty was individually adjusted to 80% accuracy under single-task conditions.
• Postural control was assessed without concurrent response production during cognitive task performance.

Main Results:

• Pronounced age differences in postural control were observed, particularly on the moving platform.
• These age-related differences in postural control performance were exacerbated under dual-task conditions.
• Younger adults maintained performance better than older adults when cognitive and postural demands were combined.

Conclusions:

• Findings support the hypothesis that older adults require greater cognitive resources for effective postural control.
• The study addresses limitations of prior research by excluding concurrent response production and individually tailoring cognitive load.
• Task constraints in cognitive and postural tasks significantly influence multi-tasking abilities and their age-related changes.