Dissociating proactive and reactive control in older adults.

Area of Science:

• Cognitive psychology
• Neuroscience of aging
• Human development

Background:

• The Dual Mechanisms of Control framework distinguishes between proactive and reactive control.
• Previous research on aging and cognitive control has yielded inconclusive results regarding the independence of these processes.
• Understanding age-related changes in proactive versus reactive control is crucial for cognitive aging research.

Purpose of the Study:

• To independently assess proactive and reactive control in older adults.
• To investigate whether age-related declines are specific to proactive control.
• To clarify the independence of proactive and reactive control mechanisms in the aging process.

Main Methods:

• Manipulated list-wide and item-specific congruency to differentiate proactive and reactive control.
• Utilized various Stroop stimuli (picture-word, integrated color-word, separated color-word) across experiments.
• Assessed performance using behavioral indices such as Stroop interference and prospective memory.

Main Results:

• Older adults demonstrated deficits in proactive control, failing to bias attention based on list-level expectancies.
• These proactive control deficits were consistent across different task paradigms and stimuli.
• Older adults successfully employed reactive control, filtering information based on item-specific expectancies.

Conclusions:

• Aging is unequivocally associated with declines in proactive control.
• Reactive control abilities remain largely preserved in older adults.
• These findings support the dissociation of proactive and reactive control systems in the context of cognitive aging.