1.   The researchers induced strokes in rats.

2.   The strokes suffered by the rats, induced by researchers, represented especially severe neurologic attacks.

3.   In the study, the researchers induced strokes in a group of laboratory rats by cutting blood flow to specific areas of the brain.

4.   The researchers induced the creation of the neurons in the neocortex of lab mice by triggering stem cells, or precursor cells, that already exist in the brain.