The scarcity heuristic impacts reward processing within the medial-frontal cortex.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Behavioral Economics

Background:

• The scarcity heuristic suggests rare objects are perceived as more valuable.
• This heuristic may influence decision-making and reward processing.

Purpose of the Study:

• To investigate if the perception of rarity affects reward evaluation in the human medial-frontal cortex.
• To examine the neural correlates of rarity perception during reward-based tasks.

Main Methods:

• Participants engaged in a gambling game involving rare and abundant cards.
• Electroencephalography (EEG) recorded brain activity during the task.
• Reward outcomes were randomized, independent of card rarity.

Main Results:

• The P300 component of event-related potentials showed amplitude differences for wins and losses after selecting rare cards, but not abundant ones.
• Perception of card rarity modulated reward processing.
• This effect occurred despite reward feedback being independent of card selection.

Conclusions:

• The scarcity heuristic exerts a top-down influence on reward evaluation, particularly reward magnitude processing.
• The human medial-frontal cortex is involved in integrating rarity perception with reward assessment.
• Perceived rarity can bias neural responses to financial rewards.