Question

Getting better on a task in a study with practice can cause a source of bias called

Answer 1

Getting better on a task in a study with practice can cause a source of bias is called it's testing effect.

Answer 2

I believe the answer is: testing effects

Testing effects refers to the perception long term memories tend to be increased when our brain is dedicated to retrieving a certain type of information over and over again. When studying, this tend to make people become bias and overconfident after repeating a certain topic, making them believe that they do not need to study the topic again before test.