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Traumatic brain injury, aging and reaction time.
D T Stuss1, L L Stethem, T W Picton
1School of Medicine (Neurology), University of Ottawa, Ontario, Canada.
Summary
Aging and traumatic brain injury (TBI) slow reaction time (RT) and impair attentional control. Both groups struggled with focused attention, suggesting specific cognitive deficits beyond general neuronal slowing.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Gerontology
Background:
- Traumatic brain injury (TBI) and advanced age are known to affect cognitive functions.
- Reaction time (RT) is a key indicator of cognitive processing speed and efficiency.
Purpose of the Study:
- To compare the effects of aging and TBI on simple and complex reaction time.
- To investigate attentional control processes in aging and TBI populations.
Main Methods:
- Participants were assessed on simple and choice reaction time tasks.
- Performance was evaluated based on reaction speed, variability, and the ability to inhibit irrelevant information.
Main Results:
- Simple reaction time (RT) was largely unaffected by aging or TBI, though TBI patients showed slower RT and greater variability.
- Both older adults (over 60) and TBI patients exhibited slower RT on choice RT tests.
- Both groups demonstrated impaired ability to inhibit redundant information processing, particularly TBI patients upon reassessment.
Conclusions:
- Deficits in aging and TBI extend beyond generalized neuronal slowing.
- Specific impairments in attentional control, manifesting as reduced focused attention, characterize both conditions.