The headline is a little misleading - from the article itself.
"Dr Ana Maria Portugal, main researcher on the project points out “We are currently unable to conclude that the touchscreen use caused the differences in attention as it may also be that children who are generally more attracted to bright, colourful features seek out touchscreen devices more than those who are not.”"
"Dr Ana Maria Portugal, main researcher on the project points out “We are currently unable to conclude that the touchscreen use caused the differences in attention as it may also be that children who are generally more attracted to bright, colourful features seek out touchscreen devices more than those who are not.”"