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Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:
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Altered low-frequency brain rhythms precede changes in gamma power during tauopathy.

Fabio R Rodrigues1, Amalia Papanikolaou1, Joanna Holeniewska1

  • 1UCL Institute of Behavioural Neuroscience, Department of Experimental Psychology, University College London, London WC1H 0AP, UK.

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This study reveals that in a mouse model of tauopathy, low-frequency brain rhythms are disrupted early, preceding changes in gamma rhythms. Electrophysiology can track tauopathy progression.

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Area of Science:

  • Neuroscience
  • Neurodegenerative Diseases
  • Computational Biology

Background:

  • Neurodegenerative disorders disrupt brain activity and rhythms.
  • Dysfunction of the tau protein is linked to some neurodegenerative conditions.
  • Understanding tauopathy's impact on brain rhythms is crucial.

Purpose of the Study:

  • To investigate how brain rhythms are affected in the rTg4510 mouse model of tauopathy.
  • To examine electrophysiological changes at early (5 months) and advanced (8 months) disease stages.
  • To correlate brain rhythm alterations with tau pathology progression.

Main Methods:

  • Measured brain rhythms in the primary visual cortex of rTg4510 mice.
  • Utilized both resting state and visually stimulated conditions.
  • Monitored pupil diameter and locomotion to define behavioral states.

Main Results:

  • At 5 months, increased low-frequency rhythms and neural synchronization were observed during resting state.
  • At 8 months, the increase in low-frequency rhythms persisted and was accompanied by reduced gamma range power.
  • Slower brain rhythms were impaired earlier than gamma rhythms in this tauopathy model.

Conclusions:

  • Brain rhythm alterations, specifically in low-frequency bands, occur early in tauopathy.
  • Gamma rhythm power decreases at later stages of tauopathy.
  • Electrophysiological recordings can serve as a biomarker for tracking tauopathy progression.