Impact of thyrotropin receptor antibody levels on fetal development in two successive pregnancies in a woman with Graves' disease.

Background: Treatment with radioiodine for Graves' disease regularly increases the level of antithyroid antibodies, and transplacental passage of stimulating thyrotropin receptor antibodies (TRAb) may cause fetal hyperthyroidism.

Case Presentation: A 21-year-old woman with Graves' disease received radioiodine treatment to avoid use of antithyroid drugs in pregnancy. She became pregnant 4 months later and was euthyroid during pregnancy.

Preterm infants' timing strategies to optical collisions.

Background: A virtual object approaching on a collision course will elicit defensive blinking in infants. Previous research has shown that when precisely timing their blinks, full-term infants shift from using a strategy based on visual angle/angular velocity to a strategy based on time between 22 and 30 weeks of age.

Aim: To investigate which timing strategy preterm infants use to determine when to make the defensive blink.