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Conceptual processing during the conscious resting state. A functional MRI study

J R Binder1, J A Frost, T A Hammeke

  • 1Department of Neurology, Medical College of Wisconsin, 9200 West Wisconsin Avenue, Milwaukee, WI 53226, USA. jbinder@post.its.mcw.edu

Journal of Cognitive Neuroscience
|February 9, 1999
PubMed
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Task-induced brain deactivations may reflect the interruption of ongoing conceptual processes during rest. Semantic tasks, engaging these processes, did not cause deactivation, unlike perceptual tasks. This suggests a unified model for brain activity during rest and task performance.

Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Task-induced decreases in cerebral blood flow (task-deactivations) are common in functional brain imaging but poorly understood.
  • One hypothesis suggests task-deactivations result from the interruption of ongoing conscious processes during rest by task demands.

Purpose of the Study:

  • To test a model where task-deactivations reflect the interruption of ongoing conceptual processes.
  • To investigate if tasks engaging conceptual processes (semantic retrieval) elicit different brain activity patterns compared to non-conceptual tasks (perceptual).

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to acquire data during resting state, a perceptual task, and a semantic retrieval task.
  • Brain activity in specific left-hemisphere cortical regions was analyzed across conditions.

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Main Results:

  • A network of left-hemisphere polymodal cortical regions showed reduced activity during perceptual tasks compared to rest.
  • These same regions exhibited similar activity levels during semantic retrieval tasks and resting states.
  • Direct comparisons between semantic and perceptual tasks revealed activation in this network during semantic processing.

Conclusions:

  • Perceptual tasks appear to interrupt ongoing conceptual processes active during rest, leading to task-deactivations.
  • The findings support a unified model explaining brain activity patterns across resting, semantic, and perceptual states.
  • This model may clarify previously unexplained results in semantic processing research.