When Lori got an A on her music history paper, she concluded that she was indeed smart. The next week, however, when she failed her biology test, she blamed the professor’s "confusing" questions for her poor result. Lori is using what barrier to accurate perception?

Self-serving bias            

Explanation:

Self-serving bias: In psychology, the term "self-serving bias" is defined as a person's propensity or proclivity to "attribute" any of the positive situations or events to his or her self or character and therefore "attribute" any of the negative situations or events to some external factors.

In social psychology, self-serving bias is generally referred to as one of the types of cognitive bias.

In the question above, Lori is using "self-serving bias".

The main reason we can denote is the possibility of teaching moral lessons and also provide a popular method for forwarding traditional knowledge from one generation to the next. Fables are often set in the animal kingdom and via attributing human characteristics to animals, they can entertain and instruct how to make wise decisions in life.

Greeks are frequently credited for the widespread of a popular fable format associated with the name of Aesop (A possible fictional character created to name a group of traditional storytellers).

Most ancient Greek fables, in modern times, are still used in children`s book and also adapted to modern adult literature.