Cited by 305Cognitive Abilities and TestingNeural and Behavioral Psychology StudiesCognitive Functions and Memory

Complex span and n-back measures of working memory: A meta-analysis

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Redick, Thomas S., Lindsey, Dakota R. B.·2013·Psychonomic Bulletin & Review

Abstract

Working memory is a construct of primary relevance to many areas of psychology. Two types of tasks have been used to measure working memory, primarily in different research areas: Complex span tasks are commonly used in behavioral studies in the cognitive and individual-differences literature, whereas n-back tasks have been used more frequently in cognitive neuroscience studies investigating the neural underpinnings of working memory. Despite both categories of tasks being labeled as "working memory" measures, previous empirical studies have provided mixed evidence regarding the shared amount of overlapping processes between complex span and n-back tasks. The present meta-analysis showed that the complex span and n-back tasks are weakly correlated, although significant heterogeneity across studies was observed. A follow-up analysis of unpublished data indicated that the sample composition affects the relationship between the complex span and n-back tasks, following the law of diminishing returns. Finally, a separate meta-analysis indicated that the simple span and n-back tasks are correlated to the same extent as are the complex span and n-back tasks. The present findings indicate that the complex span and n-back tasks cannot be used interchangeably as working memory measures in research applications.

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Crossref · 10.3758/s13423-013-0453-9

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  • Across ADHD meta-analyses, estimates of working memory, inhibitory control, and set shifting deficits rely largely on tasks criticized for suboptimal construct validity and structural organization relative to contemporary cognitive psychology.

    “Across ADHD meta-analyses, estimates of deficits in working memory, inhibitory control, and set shifting are based in large part, and in some cases entirely, on data from tasks that have been criticized for suboptimal construct validity (Redick & Lindsey, 2013) and structural organization (Friedman & Miyake, 2017) relative to contemporary advancements in cognitive psychology (Snyder et al., 2015).”

    From Executive Functioning Heterogeneity in Pediatric ADHD (2019) · cites this paper as Redick & Lindsey, 2013

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  • Backward and complex span tasks load on a common span construct.

    “prior latent-variable evidence indicates that they load on a common span construct (Engle et al., 1999; Redick & Lindsey, 2013)”

    From The asymmetry of working memory training transfer: A systematic review and meta-analysis (2026) · cites this paper as Redick & Lindsey, 2013

    The Present research section says simple and complex span tasks tend to correlate strongly and measure many similar processes. But the paper does not report latent-variable evidence that backward span and complex span load on a common factor; its latent-variable discussion concerns complex span and n-back tasks. Page numbers are unavailable in our copy. (LLM, conf=0.82)

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  • The concurrent validity of the n-back task has been questioned because previous studies reported low correlations between n-back and other WM tasks, especially complex span tasks.

    “The concurrent validity of the n-back task, however, has been questioned as previous studies have reported low correlations between the n-back task and other WM tasks, especially complex span tasks”
  • Evidence on whether complex span and n-back tasks converge on the same ability is mixed.

    “Nevertheless, evidence for their convergent validity is mixed.”

    From Which “working memory” are we talking about? Complex span tasks versus N-back (2025) · cites this paper as Redick and Lindsey, 2013

  • Because reading span uses verbal memory items, its weak associations with n-back align with Redick and Lindsey's meta-analytic finding of weak n-back-complex span relations for verbal memoranda.

    “Reading span uses verbal memory items; as such, these results align with Redick and Lindsey's (2013) meta-analytic finding of relatively weak associations between n-back tasks and complex span that used verbal memoranda.”

    From Which “working memory” are we talking about? Complex span tasks versus N-back (2025) · cites this paper as Redick and Lindsey, 2013

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Research works printed but not linked: 1

  1. [45]45. Roberts, R. M. (1998). Pruning the right branch: Memory and understanding sentences. Unpublished doctoral dissertation, California State University, Los Angeles.

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Authors
Redick, T. S., & Lindsey, D. R. B.
Affiliations
  • Purdue University West Lafayette (US)
  • Georgia Institute of Technology (US)
Corresponding author
Redick, Thomas S.
Venue
Psychonomic Bulletin & Review
Published
2013-06-04
Volume
20
Issue
6
Pages
1102-1113
ISSN
  • 1069-9384 (ISSN-L)
  • 1531-5320
OpenAlex
W2145615592
Cited by
305
References
75
Citations by year
2026: 20 · 2025: 33 · 2024: 27 · 2023: 26 · 2022: 16 · 2021: 24 · 2020: 18 · 2019: 26 · 2018: 37 · 2017: 29 · 2016: 14 · 2015: 22 · 2014: 13
FWCI
2.71
Type
journal article
Language
en
Open access
Locations
  • Psychonomic Bulletin & Review (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Purdue University
  • Indiana University-Purdue University Indianapolis
  • Office of Naval Research (N00014-12-1-1011, N00014-12-1, N00014-12, N00014)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Cognitive Abilities and Testing
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Cognitive Functions and Memory
Keywords
working memory, complex span, n-back task, task overlap, individual differences, sample composition, diminishing returns
MeSH terms
Humans, Memory, Short-Term, Neuropsychological Tests

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