Journal Article

Effects of age and cognitive load on response reprogramming

Penhune, Virginia B., Korotkevich, Yana, Trewartha, Kevin M., Li, Karen Z. H.

2015

Overview

A dual-task paradigm was used to examine the effect of cognitive load on motor reprogramming. We propose that in the face of conflict, both executive control and motor control mechanisms become more interconnected in the process of reprogramming motor behaviors. If so, one would expect a concurrent cognitive load to compromise younger adults’ (YAs) motor reprogramming ability and further exacerbate the response reprogramming ability of older adults (OAs). Nineteen YAs and 14 OAs overlearned a sequence of key presses. Deviations of the practiced sequence were introduced to assess motor reprogramming ability. A Serial Sevens Test was used as the cognitive load. A 3D motion capture system was used to parse finger movements into planning and motor execution times. Global response time analysis revealed that under single-task conditions, during prepotent transitions, OAs responded as quickly as YAs, but they were disproportionately worse than YAs during conflict transitions. Under dual-task conditions, YAs performance became more similar to that of OAs. Movement data were decomposed into planning and movement time, revealing that under single-task conditions, when responding to conflicting stimuli YAs reduced their movement time in order to compensate for delayed planning time; however, additional cognitive load prevented them from exhibiting this compensatory hastening on conflict transitions. We propose that age-related declines in response reprogramming may be linked to reduced cognitive capacity. Current findings suggest that cognitive capacity, reduced in the case of OAs or YAs under divided attention conditions, influences the ability to flexibly adapt to conflicting conditions.

• Publisher: Springer Berlin Heidelberg,Springer,Springer Nature B.V
• Subject: Ability / Adult / Adults / Age / Age differences / Age effects / Age Factors / Aged / Aging / Aging (Biology) / Aging - physiology / Attention - physiology / Biomedical and Life Sciences / Biomedicine / Cognition / Cognition - physiology / Cognitive load / Conflict / Delayed / Divided attention / Executive control / Executive Function - physiology / Female / Humans / Male / Middle Aged / Motor skills / Movement - physiology / Neurology / Neuropsychological Tests / Neurosciences / Older people / Paradigms / Planning / Psychological aspects / Psychological research / Psychomotor Performance - physiology / Reaction time / Reaction Time - physiology / Research Article / Time / Young Adult / Young adults