Watch all 4 videos : 1- https://www.youtube.com/watch?v=qPmMNbgz3Es

2- https://www.youtube.com/watch?v=0L7xzcvJzZc

3- https://www.youtube.com/watch?v=gnArvcWaH6I

4- https://www.youtube.com/watch?v=YGSj2zY2OEM

should provide a brief description of all 4 studies. Then you should compare and contrast them while drawing specific connections to cognitive development concepts and theories discussed in lecture. I also want you to discuss some of the challenges to designing and executing research studies with children.