A group of scientists have studied schizophrenics in an isolated community in Costa Rica with the objective of learning about the causes of schizophrenia worldwide. A flaw in this strategy is that schizophrenia is characterized by impaired emotional responses, and the way emotional responses are learned may differ across cultures of the world. It might even be fair to say that, on what is now a largely interconnected planet, a schizophrenic in an isolated community is a schizophrenic of no practical interest.
Which of the following, if true, would most weaken the argument made above about the group's approach?
【选项】
Living in an urban environment during childhood or as an adult doubles the risk of schizophrenia in an individual.
选项是否正确？