Final answer:
Individuals with a familial history of schizophrenia who later developed the disorder were likely to be socially withdrawn prior to its onset, a condition influenced by both genetics and environmental factors.
Step-by-step explanation:
Teens and young adults who had two relatives with schizophrenia and subsequently developed the disorder displayed a tendency to be socially withdrawn prior to the onset of their disorder. This finding aligns with the notion that schizophrenia involves both genetic vulnerability and environmental stress. The 2004 study by Tienari et al. indicates that adoptees with a high genetic risk were most likely to develop schizophrenia if they were raised in disturbed home environments.
Schizophrenia is a complex brain disorder that often presents in late adolescence or early 20s, characterized by symptoms like hallucinations, delusions, and social withdrawal. Treatment typically involves antipsychotic medications that block dopamine receptors, which can alleviate symptoms but are not a cure. This research emphasizes the importance of considering both the genetic disposition and the environment when understanding the development of schizophrenia.