Age-related differences in trust decisions: when memory fails and appearances prevail

Area of Science:

• Neuroscience
• Social Psychology
• Gerontology

Background:

• Older adults are disproportionately targeted by scams.
• Trust decisions in older adults are biased by perceived generosity and appearance over past behavior.
• Understanding the neural mechanisms behind these age-related biases is crucial.

Purpose of the Study:

• To investigate the neural mechanisms underlying age-related differences in social trust and decision-making.
• To examine how memory for past behavior and attention to social cues influence trust decisions in older versus younger adults.
• To identify specific brain regions associated with these age-dependent biases.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to capture brain activity.
• Participants engaged in a dictator game to assess generosity.
• Participants made subsequent decisions about re-engaging with individuals based on learned information.

Main Results:

• Older adults did not reliably choose to re-engage with previously generous individuals.
• Impaired associative memory for shared amounts, linked to reduced medial temporal lobe activity, was observed in older adults.
• Reduced inhibition of irrelevant facial features, associated with lower inferior frontal gyrus activity, also contributed to the bias.

Conclusions:

• Age-related differences in social decision-making stem from deficits in encoding relevant information and adaptive deployment of that information.
• Neural changes in the medial temporal lobe and inferior frontal gyrus underlie older adults' susceptibility to trust-based scams.
• These findings underscore the importance of cognitive and neural factors in protecting older adults from financial exploitation.