Diaschisis(from Greek διάσχισις meaning "shocked throughout") is a sudden change of function in a portion of the brain connected to a distant, but damaged, brain area. The site of the originally damaged area and of the diaschisis are connected to each other by neurons.
In 1914, von Monakow established the concept of diaschisis as a principle for recovery from brain lesions. Accordingly, functional changes in brain structures remote from the site of a focal brain damage, ie, diaschisis, were conceptualized as processes underlying functional recovery
The Term Diaschisis is used to describe a depression of regional neural metabolism and cerebral blood flow caused by dysfunction in an anatomically separate but functionally related neuronal region - Youtube Diaschisis Top Facts.
links: Rebuilding the Brain after Stroke : Marion Buckwalter