The date/delay effect in intertemporal choice: A combined fMRI and eye-tracking study.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Decision Science

Background:

• Temporal discounting describes how future rewards are devalued over time.
• The date/delay effect shows shallower discounting when rewards are framed as dates versus delays.
• Cognitive and neural underpinnings of the date/delay effect remain unclear.

Purpose of the Study:

• To investigate the cognitive and neural mechanisms of the date/delay effect.
• To analyze how framing future rewards as dates versus delays influences decision-making.
• To explore the role of brain activity and eye movements in temporal discounting.

Main Methods:

• Combined functional magnetic resonance imaging (fMRI) and eye-tracking data.
• Participants (N=31) completed a temporal discounting task in both date and delay conditions.
• Analysis of brain activity in specific regions and eye movement patterns.

Main Results:

• The date/delay effect was confirmed, with shallower discounting in the date condition.
• The date condition increased fixation durations on time attributes and activity in precuneus/PCC and angular gyrus (episodic thinking areas).
• More comparative eye movements were observed in the date condition; higher prefrontal activity correlated with a weaker date/delay effect.

Conclusions:

• The date condition engages episodic thinking and memory-related brain areas, increasing perceived reward proximity.
• A weaker date/delay effect is associated with greater prefrontal cortex activity, suggesting enhanced cognitive control or arithmetic processing.
• Findings support the use of comparative choice strategies and differential time estimation in the date condition.