Age and response bias: evidence from the strength-based mirror effect

Area of Science:

• Cognitive Psychology
• Neuroscience of Aging
• Human Memory

Background:

• Episodic memory performance relies on both accurate retrieval and decision processes.
• While age-related memory accuracy declines are known, age effects on memory decision mechanisms are less understood.
• Response bias, or the tendency to claim an item is remembered, significantly impacts episodic memory.

Purpose of the Study:

• To investigate age-related differences in response bias within episodic memory.
• To determine if older and younger adults differ in criterion placement for memory decisions.
• To assess the flexibility of older adults in adjusting memory decision criteria.

Main Methods:

• Manipulated list strength (word frequency or target-foil similarity) in episodic memory tasks.
• Compared hit rates and false-alarm rates between older and younger adults.
• Evaluated criterion adjustment in response to varying task demands.

Main Results:

• Both age groups showed a strength-based mirror effect: higher accuracy for strong lists.
• Older adults exhibited a more conservative response bias than younger adults.
• No significant difference was found in the ability to flexibly adjust decision criteria between age groups.

Conclusions:

• Older adults demonstrate a more conservative response bias in episodic memory.
• Age does not appear to affect the flexibility of adjusting memory decision criteria.
• Understanding response bias is crucial for a comprehensive theory of memory aging.