A growing number of academics are challenging assumptions about the negative effects of social media and smartphones on children.

SAN FRANCISCO — It has become common wisdom that too much time spent on smartphones and social media is responsible for a recent spike in anxiety, depression and other mental health problems, especially among teenagers.

But a growing number of academic researchers have produced studies that suggest the common wisdom is wrong.

The latest research, published on Friday by two psychology professors, combs through about 40 studies that have examined the link between social media use and both depression and anxiety among adolescents. That link, according to the professors, is small and inconsistent.

“There doesn’t seem to be an evidence base that would explain the level of panic and consternation around these issues,” said Candice L. Odgers, a professor at the University of California, Irvine, and the lead author of the paper, which was published in the Journal of Child Psychology and Psychiatry.