Researchers such as Feeney and Noller question the stability of attachment style across the life span since studies that measured attachment styles at time points ranging from 2 weeks to 8 months found that 1 out of 4 adults' attachment style changed. Furthermore, a study by Lopez and Gormley found that attachment styles could change during the first year of college and that changes to more secure attachment styles were associated with adjustments in self-confidence ratings and coping styles. On the other hand, attachment styles in childhood mirror the ones found in adult romantic relationships. In addition, research has shown that building interpersonal connections strengthens neural regulatory systems that are involved in emotions of empathy, enjoyment of positive social events, and stress management, providing evidence that early social interactions affect adult relationships.