Optimistic people are all alike: Shared neural representations supporting episodic future thinking among optimistic...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Personality Psychology

Background:

• Optimism influences future-oriented cognition by focusing on positive outcomes.
• Understanding the neural basis of optimism's effect on future thinking is crucial.

Purpose of the Study:

• To investigate how the brain represents individual differences in episodic future thinking modulated by optimism.
• To explore the neural mechanisms underlying optimism's impact on imagining future events.

Main Methods:

• Two functional MRI (fMRI) studies were conducted.
• Participants underwent fMRI while performing an episodic future thinking task with varying emotional valence.
• Intersubject representational similarity analysis and multidimensional scaling of medial prefrontal cortex (MPFC) activity were employed.

Main Results:

• Optimistic individuals showed similar neural representations in the MPFC, while less optimistic individuals had more idiosyncratic representations.
• MPFC activity clearly mapped referential target and emotional valence onto different dimensions.
• The emotional dimension's weights correlated with optimism scores, indicating optimistic individuals distinguish positive from negative events more clearly.

Conclusions:

• Shared neural processing in the MPFC among optimistic individuals supports episodic future thinking.
• Optimism facilitates psychological differentiation between positive and negative future events through distinct neural representations.