Effects of age and cognitive load on response reprogramming.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Human Movement Science

Background:

• Motor reprogramming is crucial for adapting to unexpected changes in movement sequences.
• Cognitive load, particularly under dual-task conditions, may impact the efficiency of motor reprogramming.
• Age-related differences in cognitive capacity could influence motor reprogramming abilities.

Purpose of the Study:

• To investigate the impact of cognitive load on motor reprogramming in younger adults (YAs) and older adults (OAs).
• To examine the interplay between executive control, motor control, and cognitive capacity during motor reprogramming.
• To determine if concurrent cognitive load exacerbates motor reprogramming deficits in OAs and affects YAs.

Main Methods:

• A dual-task paradigm was employed, combining a motor reprogramming task (sequence deviations) with a cognitive load task (Serial Sevens Test).
• Nineteen YAs and 14 OAs participated, overlearning a key press sequence.
• A 3D motion capture system analyzed finger movements, differentiating planning and execution times.

Main Results:

• Under single-task conditions, OAs showed greater difficulty with conflict transitions compared to YAs.
• Under dual-task conditions, YAs' performance mirrored that of OAs, indicating compromised reprogramming ability.
• YAs' compensatory strategy of reducing movement time under conflict was inhibited by cognitive load.

Conclusions:

• Age-related declines in response reprogramming may be associated with reduced cognitive capacity.
• Cognitive capacity, whether inherently lower in OAs or divided in YAs, significantly influences the ability to adapt to conflicting motor demands.
• Findings highlight the interconnectedness of cognitive and motor control mechanisms in flexible behavioral adaptation.