If your memory of the home run you hit in the softball game becomes exaggerated to enhance your own performance, then you have fallen prey to a common memory tendency to distort your memories to fit your feelings about the world. This is called .

bias.  

Explanation:

Bias can be defined as a tendency to perceive something in a certain way. It is a prejudiced way of perceiving about something or someone; also categorised as a type of stereotype.

The given scenario is an example of cognitive bias. It happens when the brain tries to interpret and simplify the information. The given scenario is an example of bias because the memory is trying to distort the memories so that it can fit to the feelings about the world.

So, the correct answer is bias.