A team of researchers with members from Instituto de Investigación Sanitaria Gregorio Marañón, the University of Southern California and the Autonomous University of Barcelona has found that some parts of the male brain change in size after a man fathers a child. In their paper published in the journal Cerebral Cortex, the group describes how they studied MRI scans of new fathers to learn more about how their brains might change as they adapt to fatherhood.