Modify an existing program (or write one from scratch) that implements a cogniti

Modify an existing program (or write one from scratch) that implements a cognitive psychology experiment and saves the data in a format from which they can be easily accessed and analysed.
My experiment idea: the word (colour: eg. yellow, green, red..) shown on the screen is of a different colour than the word itself (the word green is shown in red)–> see how many mistakes people make
Please have a look at the powerpoint files to see what I have learned about Matlab. We have only started using it a few weeks ago, so the program should not be too complicated, but rather something quite simple a beginner would be able to do