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Quantifying the Behavioural Relevance of Hippocampal Neurogenesis

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  • Stanley E Lazic
  • Johannes Fuss
  • Peter Gass

Abstract

Few studies that examine the neurogenesis–behaviour relationship formally establish covariation between neurogenesis and behaviour or rule out competing explanations. The behavioural relevance of neurogenesis might therefore be overestimated if other mechanisms account for some, or even all, of the experimental effects. A systematic review of the literature was conducted and the data reanalysed using causal mediation analysis, which can estimate the behavioural contribution of new hippocampal neurons separately from other mechanisms that might be operating. Results from eleven eligible individual studies were then combined in a meta-analysis to increase precision (representing data from 215 animals) and showed that neurogenesis made a negligible contribution to behaviour (standarised effect = 0.15; 95% CI = −0.04 to 0.34; p = 0.128); other mechanisms accounted for the majority of experimental effects (standardised effect = 1.06; 95% CI = 0.74 to 1.38; p = 1.7×10−11).

Suggested Citation

  • Stanley E Lazic & Johannes Fuss & Peter Gass, 2014. "Quantifying the Behavioural Relevance of Hippocampal Neurogenesis," PLOS ONE, Public Library of Science, vol. 9(11), pages 1-14, November.
    • Handle: RePEc:plo:pone00:0113855
    DOI: 10.1371/journal.pone.0113855
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