Brain Structure and Function

, Volume 222, Issue 3, pp 1231–1241 | Cite as

Rapid language-related plasticity: microstructural changes in the cortex after a short session of new word learning

Original Article

Abstract

Human brain imaging revealed that the brain can undergo structural plasticity following new learning experiences. Most magnetic resonance imaging (MRI) uncovered morphometric alternation in cortical density after the long-term training of weeks to months. A recent diffusion tensor imaging (DTI) study has found changes in diffusion indices after 2 h of training, primarily in the hippocampus. However, whether a short learning experience can induce microstructural changes in the neocortex is still unclear. Here, we used diffusion MRI, a method sensitive to tissue microstructure, to study cortical plasticity. To attain cortical involvement, we used a short language task (under 1 h) of introducing new lexical items (flower names) to the lexicon. We have found significant changes in diffusivity in cortical regions involved in language and reading (inferior frontal gyrus, middle temporal gyrus, and inferior parietal lobule). In addition, the difference in the values of diffusivity correlated with the lexical learning rate in the task. Moreover, significant changes were found in white matter tracts near the cortex, and the extent of change correlated with behavioral measures of lexical learning rate. These findings provide first evidence of short-term cortical plasticity in the human brain after a short language learning task. It seems that short training of less than an hour of high cognitive demand can induce microstructural changes in the cortex, suggesting a rapid time scale of neuroplasticity and providing additional evidence of the power of MRI to investigate the temporal and spatial progressions of this process.

Keywords

DTI Language Neuroplasticity Lexical learning 

Notes

Acknowledgments

The authors acknowledge with thanks the support of the Israel Science Foundation (ISF Grant no. 994/08) and by HFSP grant (no. RGP0057/2016) and of the Australian Research Council Centre of Excellence for Cognition and its Disorders (CE110001021), http://www.ccd.edu.au.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Shir Hofstetter
    • 1
  • Naama Friedmann
    • 1
    • 2
  • Yaniv Assaf
    • 1
    • 3
  1. 1.Sagol School of NeuroscienceTel Aviv UniversityTel AvivIsrael
  2. 2.Language and Brain Lab, School of EducationTel Aviv UniversityTel AvivIsrael
  3. 3.Department of Neurobiology, George S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael

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