Studies of Finnish mothers who were pregnant when they found out that their husbands had been killed during the Winter War of 1939–1940 have shown that their children were significantly more likely to develop schizophrenia when compared with mothers who found out about their husbands' death after pregnancy, suggesting that maternal stress may have an effect.
دراسات للأمهات الفنلنديات اللاتي كانوا حوامل أثناء إكتشاف موت أزواجهم أثناء حرب الشتاء في 1930-1940 أطفالهم أعربوا عن قابلية أعلي للإصابة بالشيزوفرينيا بالمقارنة بالأمهات اللاتي اكتشفن موت أزواجهم بعد الحمل مما يقترح أن الضغط العصبي و العضوي للأم له تأثير.