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Building Memory Representations for Exemplar-Based Judgment: A Role for Ventral Precuneus.

Sara Stillesjö1,2, Lars Nyberg1,2,3, Linnea Karlsson Wirebring2,4

  • 1Department of Integrative Medical Biology, Umeå University, Umeå, Sweden.

Frontiers in Human Neuroscience
|August 6, 2019
PubMed
Summary
This summary is machine-generated.

The ventral precuneus supports exemplar-based judgment by aiding episodic memory retrieval. Increased activity in this region during learning predicts better performance in multiple-cue judgment tasks.

Keywords:
cognitive modelingexemplar-based modelfMRIjudgment and decision makingmultiple-cue judgmentprecuneus

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • The ventral precuneus is a key brain region implicated in multiple-cue judgment.
  • Its activation is linked to exemplar-based judgment, relying on memory for similar past cases.
  • Increased activity in the ventral precuneus, ventromedial prefrontal cortex (vmPFC), and medial temporal lobes (MTL) during learning correlates with retrieval success.

Purpose of the Study:

  • To investigate the neurocognitive link between learning-related activity changes in the ventral precuneus and exemplar-based judgment.
  • To provide evidence for the ventral precuneus's role in episodic memory processes during judgment tasks.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants (N=27) performed a multiple-cue judgment task designed to induce exemplar-based processing.
  • Brain activity during late learning was contrasted with early learning.

Main Results:

  • Higher activity was observed in the ventral precuneus, bilateral MTL, and vmPFC during late learning compared to early learning.
  • Activity in the ventral precuneus and vmPFC parametrically increased between judgment events.
  • Ventral precuneus activity levels predicted post-learning performance.

Conclusions:

  • The ventral precuneus supports exemplar-based judgment by contributing to the building, storage, and retrieval of memory representations.
  • These findings highlight the role of episodic memory processes in complex decision-making.
  • The study provides novel neurocognitive evidence for the ventral precuneus's function in judgment and memory.