Iris color and day-night changes in the sympathovagal ratio.

Iris melanocytes are innervated by parasympathetic and sympathetic nerve endings. Light affects autonomic nervous system activity via the retino-hypothalamic pathway. The hypothesis that the day-to-night variations in the sympatovagal ratio (LF/HF) may differ among individuals with different brown iris patterns was tested.

Investigating fear of childbirth in pregnant women and its relationship between anxiety sensitivity and somatosensory amplification.

The causes of fear of childbirth and the factors that affect it are not fully explained. The aim of this study was to investigate the relationship between fear of childbirth in pregnant women and anxiety sensitivity and somatosensory amplification. The study included 100 healthy pregnant women who were admitted to the Obstetrics and Gynaecology Department of a tertiary hospital in Turkey at 28-40 weeks of gestation.