"The study followed them over the next 2.5 years, bringing them into the lab at 18 months and 3.5 years. At the 18-month and 3.5-year visits, toddlers took part in a computer task in which they were trained to search for a red apple amongst a varying number of either blue apples (easy search), or blue apples and red apple slices (difficult search). An eye tracker monitored their gaze and visually rewarded the child when they found the red apple, allowing them to perform the task even though they were too young to verbally describe what they were doing."
No discussion as to any other effect of screen use. Why did this need study? Humans who use a thing more often are better at working with thing?
Better studies on kids with screen time focuses on spatial development: https://digitalcommons.liu.edu/cgi/viewcontent.cgi?article=1...
"Greater daily digital usage was associated with lower visual spatial performance. Spending even small amounts of time daily with integrated technology was associated with lower WPPSI-IV overall intelligence test scores, and visual spatial scores. Those with the least amount of resources are at the most risk for lower visual spatial abilities"