Sensitivity of negative subsequent memory and task-negative effects to age and associative memory performance

Area of Science:

• Neuroscience
• Cognitive Psychology
• Aging Research

Background:

• Age-related cognitive decline impacts memory functions.
• Neural mechanisms underlying memory and aging are complex.
• Default Mode Network (DMN) activity is implicated in cognitive processes and aging.

Purpose of the Study:

• Investigate the relationship between age and brain activity during memory encoding.
• Differentiate between negative subsequent memory effects and task-negative effects across age groups.
• Examine how these neural effects relate to memory performance in aging.

Main Methods:

• Functional Magnetic Resonance Imaging (fMRI) was used to scan young, middle-aged, and older adults (n=136).
• Participants performed an associative recognition task involving word pairs.
• Analysis focused on encoding-related negative subsequent memory effects and task-negative effects within the Default Mode Network.

Main Results:

• Negative subsequent memory effects showed a graded decrease with age.
• Task-negative effects decreased significantly between young and middle-aged adults, with no further change in older adults.
• Negative subsequent memory effects did not correlate with memory performance, but task-negative effects predicted performance in older adults.

Conclusions:

• Negative subsequent memory and task-negative effects are supported by dissociable neural mechanisms.
• These effects likely represent distinct cognitive processes related to memory and aging.
• Task-negative effects in older adults may reflect sensitivity to age-related neuropathology and predict memory outcomes.