Deanna believes she is awful at public speaking. When the first presentation is assigned, Deanna puts off choosing and researching her topic and says, "What's the use of trying, I$\text{'}$m going to bomb this speech anyway." She's so far behind that she is embarrassed to ask for help. On the day of her speech, Deanna tries to "wing it$".$ Ultimately, she earns a failing grade on her speech and walks away with her perception confirmed: "See, I$\text{'}$m terrible at public speaking!" Unfortunately, Deanna doesn't realize that her behaviors almost guaranteed that she would fail the speech. This is an example of