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A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
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A coordinate-based meta-analysis of the n-back working memory paradigm using activation likelihood estimation.

Hui Wang1, Weijiang He1, Jingting Wu1

  • 1Key Laboratory for NeuroInformation of Ministry of Education, High-Field Magnetic Resonance Brain Imaging Key Laboratory of Sichuan Province, Center for Information in Medicine, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China.

Brain and Cognition
|February 2, 2019
PubMed
Summary

The n-back task consistently activates frontal and parietal brain regions for working memory (WM). Specific conditions like memory load and age modulate activation in areas such as the anterior insula.

Keywords:
Anterior insula (aI)Frontal cortexN-back taskParietal cortexQuantitative meta-analysisWorking memory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • The n-back task is a standard functional neuroimaging tool for studying working memory (WM).
  • Previous research indicates frontal and parietal regions are consistently activated during n-back tasks.

Purpose of the Study:

  • To perform a quantitative meta-analysis of 96 studies using the n-back task.
  • To identify consistently activated brain regions and investigate how different task conditions modulate activation patterns.

Main Methods:

  • Activation Likelihood Estimation (ALE) meta-analysis was employed.
  • 96 primary studies of n-back task variants were analyzed, categorizing data by memory load, object type, age, and gender.

Main Results:

  • Six cortical regions, including bilateral middle frontal gyrus, inferior parietal lobule, precuneus, left superior frontal gyrus, left anterior insula, and bilateral thalamus, showed consistent activation.
  • Higher memory load (2-back vs. 1-back) increased activation in left middle frontal gyrus, left inferior frontal gyrus, and left anterior insula.
  • Object identity processing (vs. location) increased activation in the right anterior insula.
  • Younger compared to older adults showed greater activation in frontal, parietal, and right anterior insula regions.
  • No significant gender differences in activation were observed.

Conclusions:

  • The n-back task reliably activates frontal and parietal cortical regions.
  • Specific experimental conditions, including memory load, object processing, and age, differentially modulate activation in regions like the anterior insula, highlighting their context-dependent roles in working memory.