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Related Experiment Videos

Brain activation modulated by sentence comprehension

M A Just1, P A Carpenter, T A Keller

  • 1Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

Science (New York, N.Y.)
|October 4, 1996
PubMed
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Brain activation during sentence comprehension increases with linguistic complexity. This neural activity volume depends on the task's computational demand, observed in both left and right hemisphere language areas.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psycholinguistics

Background:

  • Sentence comprehension involves intricate neural processing.
  • Linguistic complexity is hypothesized to influence the extent of brain activation.

Purpose of the Study:

  • To investigate the relationship between linguistic complexity and brain activation volume during sentence comprehension.
  • To identify the specific brain regions involved in processing sentences of varying complexity.

Main Methods:

  • Utilized echo-planar functional magnetic resonance imaging (fMRI) to measure the volume of neural tissue activated.
  • Analyzed brain activation patterns in response to visually presented sentences with differing linguistic complexity.

Main Results:

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  • Brain activation volume significantly increased with higher linguistic complexity.
  • Activation was observed in classical left-hemisphere language areas (Wernicke's and Broca's areas) and their homologous right-hemisphere counterparts.
  • Right-hemisphere activation volumes were considerably smaller than those in the left hemisphere.

Conclusions:

  • The extent of neural activity is directly related to the computational demands of a cognitive task, such as sentence comprehension.
  • Language processing engages a bilateral network, with a dominant role for the left hemisphere.