|MadSci Network: Neuroscience|
Dear Kevin, You have a good scientific mind for a 9 year old. The answer to your question will depend on many circumstances. If the child is in a secure and comfortable environment that she is used to, she may prefer the novel (new) toy to the familiar one. I would suggest that you run this test several times with different toys because results may vary according to the attributes of the toys. Some new toys can be scary and others may be boring. Do the test several times before you reach a conclusion and keep track of the attributes of the toys. Good luck!
Try the links in the MadSci Library for more information on Neuroscience.