> Zeigarnik effect: uncompleted tasks and unmet goals tend to pop into one’s mind. Once the task is completed and the goal is reached, however, this stream of reminders comes to a stop. For example, if you listen to a song, your mind moves on; if you listen to a song that’s abruptly cut off in the middle, your mind will continue inserting bits and pieces of the song into your stream of thoughts, reminding you that you’re not “done” listening.
Interesting, I wonder if this is the same as when you have a song stuck (looping) in your head. I've been told that listening to the whole song will make it unstuck.