The causal link between phenomena refers to the existence of one phenomenon, others will cause another phenomenon, then there is a causal link between the two phenomena. One way to explore the causal link between phenomena is to seek the same method, which means that the phenomenon being studied appears on different occasions, and in each case, only one situation is common, then the only common situation is causally related to the phenomenon.
The statement 'Psychologists have found that 75 percent of people with antisocial personalities have a narrow mind. It follows that narrow-mindedness may be the cause of antisocial personality formation' applies the method of seeking common ground based on the above definition.