Brains striving for coherence: Long-term cumulative plot formation in the default mode network

Research output: Contribution to journalArticle

Abstract

Many everyday activities, such as engaging in conversation or listening to a story, require us to sustain attention over a prolonged period of time while integrating and synthesizing complex episodic content into a coherent mental model. Humans are remarkably capable of navigating and keeping track of all the parallel social activities of everyday life even when confronted with interruptions or changes in the environment. However, the underlying cognitive and neurocognitive mechanisms of such long-term integration and profiling of information remain a challenge to neuroscience. While brain activity is generally traceable within the short time frame of working memory (milliseconds to seconds), these integrative processes last for minutes, hours or even days. Here we report two experiments on story comprehension. Experiment I establishes a cognitive dissociation between our comprehension of plot and incidental facts in narratives: when episodic material allows for long-term integration in a coherent plot, we recall fewer factual details. However, when plot formation is challenged, we pay more attention to incidental facts. Experiment II investigates the neural underpinnings of plot formation. Results suggest a central role for the brain's default mode network related to comprehension of coherent narratives while incoherent episodes rather activate the frontoparietal control network. Moreover, an analysis of cortical activity as a function of the cumulative integration of narrative material into a coherent story reveals to linear modulations of right hemisphere posterior temporal and parietal regions. Together these findings point to key neural mechanisms involved in the fundamental human capacity for cumulative plot formation.

Details

Authors
  • Kristian Tylén
  • Peer Christensen
  • Andreas Roepstorff
  • Torben Lund
  • Svend Østergaard
  • Merlin Donald
Organisations
External organisations
  • Aarhus University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Psychology (excluding Applied Psychology)

Keywords

  • fMRI, Default mode network, Memory, Narrative
Original languageEnglish
Pages (from-to)106-114
JournalNeuroImage
Volume121
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Linguistics and Phonetics (015010003)