Cited by 108Face Recognition and PerceptionFunctional Brain Connectivity StudiesNeural and Behavioral Psychology Studies

Robust is not necessarily reliable: From within-subjects fMRI contrasts to between-subjects comparisons

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Infantolino, Zachary P., Luking, Katherine R., Sauder, Colin L., Curtin, John J., Hajcak, Greg·2018·NeuroImage

Abstract

Advances in cognitive and affective neuroscience come largely from within-subjects comparisons, in which the functional significance of neural activity is determined by contrasting two or more experimental conditions. Clinical and social neuroscience studies have attempted to leverage between-subject variability in such condition differences to better understand psychopathology and other individual differences. Shifting from within-to between-subjects comparisons requires that measures have adequate internal consistency to function as individual difference variables. This is particularly relevant for difference scores-which have lower reliability. The field has assumed reasonable internal consistency of neural measures based on consistent findings across studies (i.e., if a within-subject difference in neural activity is robust, then it must be reliable). Using one of the most common fMRI paradigms in the clinical neuroscience literature (i.e., a face- and shape-matching task), in a large sample of adolescents (N = 139) we replicate a robust finding: amygdala activation is greater for faces than shapes. Moreover, we demonstrate that the internal consistency of the amygdala in face and shape blocks was excellent (Spearman-Brown corrected reliability [SB] > .94). However, the internal consistency of the activation difference between faces and shapes was nearly zero (SB = -.06). This reflected the fact that the amygdala response to faces and shapes was highly correlated (r = .97) across individuals. Increased neural activation to faces versus shapes could not possibly function as an individual difference measure in these data-illustrating how neural activation can be robust within subjects, but unreliable as an individual difference measure. Strong and reproducible condition differences in neural activity are not necessarily well-suited for individual differences research-and neuroimaging studies should always report the internal consistency of, and correlations between, activations used in individual differences research.

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  1. Chiou JS Spreng RA 1996 The reliability of difference scores: A re-examination Journal of Consumer Satisfaction, Dissatisfaction, and Complaining Behavior 9 158 167
  2. Zumbo BD 1999 The simple difference score as an inherently poor measure of change: Some reality, much mythology Thompson B Advances in Social Science Methodoloy 269 304 Greenwich JAI Press

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Authors
Infantolino, Z. P., Luking, K. R., Sauder, C. L., Curtin, J. J., & Hajcak, G.
Affiliations
  • Stony Brook University (US)
  • The University of Texas at San Antonio Health Science Center (US)
  • University of Wisconsin–Madison (US)
  • Florida State University (US)
Corresponding author
Infantolino, Zachary P.
Venue
NeuroImage
Publisher
Elsevier BV
Published
2018-06
Volume
173
Pages
146-152
ISSN
1053-8119 (ISSN-L)
OpenAlex
W2793110972
Cited by
108
References
33
Citations by year
2026: 6 · 2025: 8 · 2024: 13 · 2023: 14 · 2022: 15 · 2021: 26 · 2020: 12 · 2019: 11 · 2018: 2
FWCI
7.59
Type
journal article
Language
en
Open access
Locations
  • NeuroImage (acceptedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Mental Health (R01 MH097767)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Face Recognition and Perception
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
internal consistency, individual differences, amygdala activation, face processing, adolescents
MeSH terms
Adolescent, Brain, Brain Mapping, Child, Female, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Pattern Recognition, Visual, Reproducibility of Results

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