It it not uncommon at all for people to do this. The great thing about this is that if you get the first degree, you will already have the basic courses under your belt for once you get to the second school provided the credits will transfer over. This is a great thing because it will not take you as long to complete the second degree as you will not have to go through all of the basics again. There may be a few other math classes that you would have to take in order to do the algorithms for the graphics part but other than that you should be all good to go. Make sure that if you go for the Psych degree first that when you get ready to go to your second school, you speak with the admissions and counselors to ensure that your credits are going to transfer.