The people with the lowest amount of social contact had overall brain volume that was significantly lower than those with the most social contact. The total brain volume, or the sum of white and grey matter, as a percentage of the total intracranial volume, or the volume within the cranium, including the brain, meninges, and cerebrospinal fluid, was 67.3% in the lowest contact group compared to 67.8% in the highest contact group. They also had lower volumes in areas of the brain such as the hippocampus and amygdala that play a role in memory and are affected by dementia.
The study does not prove that social isolation causes brain shrinkage; it only shows an association.
Social isolation linked to lower brain volume — American Academy of Neurology. “Social isolation linked to lower brain volume.” ScienceDaily https://www.sciencedaily.com/releases/2023/07/230712165229.htm (accessed July 13, 2023).
Yikes!
lifeunderwriter.net 
Does computer contact count as socialization?
Yes, but probably not as effective in combating social isolation when compared to face to face interactions.
https://www.sciencedirect.com/science/article/pii/S2352827321002950
At least it helps him. I really prefer.
Is there a relationship between social contact and the amount of focus someone has overally? I think there are more factors to consider.
I’m sure there is a relationship but this is not a topic I’ve done research on. Yes, there are always more factors to consider. It’s never a one to one relationship with cause and effect.
Yes Yes. I can’t wait to see more relationships on the topic for expounding. It would bring more clarity on the cause and effects with its factors