A young girl uses a smart phone.

Doctoral candidate, Amanda Lawrence, M.S., and principal investigator of the DESC Lab, Daniel Choe, Ph.D., conducted a study showing associations between young preschool-aged children's performance on behavioral measures of self-regulation and their parent-reported age at which they began using screen media devices and their current amount of screen media device use. Children who began using screen media devices at a young age and those who currently spent more hours per week specifically using mobile screen devices, such as smart phones and tablets, performed more poorly on self-regulation measures. The research letter reporting these findings was recently published online by JAMA Pediatrics, as well as reported in a UC Davis press release.