Memory-based decision-making with heuristics: evidence for a controlled activation of memory representations

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Decision Science

Background:

• Daily decisions frequently depend on recalling information from long-term memory.
• Behavioral studies suggest heuristics simplify decisions by limiting information retrieval.
• It remains unclear if heuristic use truly corresponds to reduced memory search.

Purpose of the Study:

• To investigate if heuristic-based decision-making involves limited memory search.
• To examine the neural correlates of memory-based decisions using functional magnetic resonance imaging (fMRI).
• To test the "take-the-best" heuristic's neural underpinnings.

Main Methods:

• Participants performed memory-based decisions using the "take-the-best" heuristic.
• fMRI monitored brain activity, specifically activation of long-term memory representations.
• Decision trials varied in information retrieval and processing demands.

Main Results:

• Parametric activation in the dorsolateral prefrontal cortex (PFC) correlated with the amount of information needed.
• Posterior brain areas showed parametric activation patterns, indicating broader memory engagement than expected.
• Activation in posterior areas was modulated by the information's decision relevance.

Conclusions:

• Memory-based decision-making is mediated by the dorsolateral PFC, which selectively controls posterior memory storage.
• Neural evidence suggests a selective boosting of decision-relevant attributes within posterior memory areas, rather than a strictly limited search.