[Gravitational] waves are perturbations of spacetime which travel at c. However, spacetime is allowed to expand and contract faster than c. An expansion followed by a compression is pretty much the definition of a compression wave.
Damage to the brainâs frontal and temporal lobes causes forms of dementia called frontotemporal disorders. Frontotemporal disorders are the result of damage to neurons (nerve cells) in parts of the brain called the frontal and temporal lobes. As neurons die in the frontal and temporal regions, these lobes atrophy, or shrink.
The frontals lobes are the brain's largest structures and consequently have been associated with a large number of disorders. These include ADHD, schizophrenia, and bipolar disorder (prefrontal cortex). Symptoms of brain tumours affecting the Frontal Lobe.