Neural congruence between intertemporal and interpersonal self-control: Evidence from delay and social discounting

Area of Science:

• Neuroscience
• Cognitive Psychology
• Behavioral Economics

Background:

• Behavioral studies suggest functional similarities between delay discounting (self-control) and social discounting (altruism).
• Existing research lacks direct neural evidence to support this functional link between farsighted and social decision-making.

Purpose of the Study:

• To investigate the neural underpinnings of delay and social discounting using functional magnetic resonance imaging (fMRI).
• To identify common and distinct brain activity patterns associated with intertemporal and interpersonal choice.

Main Methods:

• Twenty-five young adults performed delay and social discounting tasks while undergoing fMRI.
• Spatiotemporal partial least squares analysis was employed to examine brain activity patterns.

Main Results:

• Both delay and social discounting engaged common neurocognitive mechanisms within frontoparietal control, default, and mesolimbic reward networks.
• Distinct neural profiles differentiated high and low discounters: high discounters showed increased medial temporal lobe and limbic activity, while low discounters exhibited activity in the medial prefrontal cortex and right temporoparietal junction.

Conclusions:

• Common neurocognitive mechanisms support both farsighted and social decision-making, regardless of outcome type (intertemporal vs. interpersonal).
• Observed neural differences between high and low discounters may reflect biological bases for individual variations in discount rates.