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Repetitive transcranial magnetic stimulation (TMS) improved language and communication in patients with primary progressive aphasia (PPA). This neuromodulation technique also enhanced functional brain connectivity, suggesting a potential new treatment for PPA.

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Area of Science:

  • Neuroscience
  • Neurology
  • Cognitive Science

Background:

  • Primary progressive aphasia (PPA) is a syndrome characterized by language impairment with preserved other cognitive functions.
  • Neuroimaging reveals selective PPA effects on the left prefrontal and temporo-parietal language network.
  • Current treatments for PPA are limited, necessitating novel therapeutic strategies.

Purpose of the Study:

  • To investigate if repetitive transcranial magnetic stimulation (rTMS) can modulate functional connectivity within the affected language network in PPA patients.
  • To assess the efficacy of rTMS in improving language and communication deficits in various PPA subtypes.

Main Methods:

  • A double-blinded, sham-controlled, cross-over study involving 10 days of intermittent theta burst stimulation (iTBS).
  • Participants included 4 logopenic variant (lvPPA), 2 non-fluent variant (nfvPPA), 1 semantic variant (svPPA), and 3 with primary progressive apraxia of speech (PPAOS).
  • iTBS targeted the left caudal middle frontal gyrus, individualized based on functional connectivity with the language network. Assessments included language tests, functional communication evaluations, and resting-state fMRI.

Main Results:

  • Active iTBS led to significant language improvements across all PPA subtypes and PPAOS, observed in both functional communication and standardized language assessments.
  • Increased functional connectivity within language and other cognitive networks was noted after active iTBS treatment.
  • Improvements in language function correlated with enhanced functional network connectivity.

Conclusions:

  • Personalized, functional-network-guided iTBS shows preliminary promise for improving language impairments in PPA and PPAOS.
  • The study suggests a neural mechanism involving increased functional network connectivity underlying TMS-induced benefits in PPA.
  • This approach offers a potential new avenue for therapeutic intervention in PPA.