The theory is that the brain is electric and fluctuations from the sun can cause differences in speech… thus explaining accents in general. As you may or may not know, the universe is electric and so is our sun, read about it here: http://www.electricuniverse.info/Electric_Sun_theory
In the story of the Tower of Babel, everyone in the land spoke the same language. They were working together to build a tower that would reach to heaven. https://en.wikipedia.org/wiki/Tower_of_Babel God saw this and said, “Come, let us go down and confuse their language”, meaning a fluctuation (CME etc.) from the sun which caused a change in language on the earth.
An excellent example of interference with the brain on an electrical level (stroke, et al) causing a change in accent is Foreign Accent Syndrome (FAS). Foreign Accent Syndrome happens to some people after having a stroke or other traumatic brain injury:
Accents are caused by electrical interactions between the earth’s magnetic field and the sun having an effect on the brain. This explains why different people in various areas have different accents. This can happen on a micro scale, as in the cases of people having strokes which change their accents. Or it can happen on a mass scale, which apparently occurred during a solar event in our recorded history.
from SECTUAL – Discussion Forum http://www.sectual.com/thread-2482.html