Metacognitive ability correlates with hippocampal and prefrontal microstructure

Micah Allen*, James C. Glen, Daniel Mullensiefen, Dietrich Samuel Schwarzkopf, Francesca Fardo, Darya Frank, Martina F. Callaghan, Geraint Rees

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

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Abstract

The ability to introspectively evaluate our experiences to form accurate metacognitive beliefs, or insight, is an essential component of decision-making. Previous research suggests individuals vary substantially in their level of insight, and that this variation is related to brain volume and function, particularly in the anterior prefrontal cortex (aPFC). However, the neurobiological mechanisms underlying these effects are unclear, as qualitative, macroscopic measures such as brain volume can be related to a variety of microstructural features. Here we leverage a high-resolution (800 µm isotropic) multi-parameter mapping technique in 48 healthy individuals to delineate quantitative markers of in vivo histological features underlying metacognitive ability. Specifically, we examined how neuroimaging markers of local grey matter myelination and iron content relate to insight as measured by a signal-theoretic model of subjective confidence. Our results revealed a pattern of microstructural correlates of perceptual metacognition in the aPFC, precuneus, hippocampus, and visual cortices. In particular, we extend previous volumetric findings to show that right aPFC myeloarchitecture positively relates to metacognitive insight. In contrast, decreased myelination in the left hippocampus correlated with better metacognitive insight. These results highlight the ability of quantitative neuroimaging to reveal novel brain-behaviour correlates and may motivate future research on their environmental and developmental underpinnings.

Original languageEnglish
JournalNeuroImage
Volume149
Pages (from-to)415-423
Number of pages9
ISSN1053-8119
DOIs
Publication statusPublished - 1 Apr 2017

Keywords

  • Metacognition
  • Quantitative MRI
  • Hippocampus
  • Iron
  • Myelination
  • Microstructure
  • INTRINSIC FUNCTIONAL CONNECTIVITY
  • HUMAN CEREBRAL-CORTEX
  • VARYING FLIP ANGLES
  • HUMAN BRAIN
  • IN-VIVO
  • MAGNETIZATION-TRANSFER
  • QUANTITATIVE MRI
  • MULTIPLE-SCLEROSIS
  • MYELIN CONTENT
  • SPOILED FLASH

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