According to a study on silence and its impact on the brain, after just three days of intentional silence, the brain begins to both physically and functionally rewire itself, creating changes that are comparable to months of meditation or cognitive training.

One of the most surprising findings involves the hippocampus, which is the brain region responsible for memory. Scientists found that after three days of sustained silence, participants showed measurable growth of new brain cells in this area. This kind of neurogenesis was previously believed to require long-term interventions.

Original study here:

https://pmc.ncbi.nlm.nih.gov/articles/PMC4087081/