Definition of opacity for English Language Learners. : 1  the quality of a material that does not allow light to pass through it : the quality of being opaque. : 2  the quality of being difficult to understand or explain.
Research has shown that this is not true, and that brain cells can and do regenerate, especially in the areas related to learning, decision-making, visual recognition, and the way people perceive objects in space.weet. For a long time, scientists thought that it was impossible for brain cells to regenerate because they assumed that any new cells would disrupt the order of the brain.
Thru plasticity, the brain forms new synaptic connections to reroute information around the damaged areas. What this means is if a certain set of cells are there to do one action, and those cells are damaged, other sets of cells may have to take over that action which is part of will brain heal itself.