The blank can be filled as: When a person has a better memory for items at the beginning of a list she or he tries to learn, the Primacy effect is demonstrated.
What is Primacy effect?
Primacy effect refers to a tendency in which a person remembers the beginning of the information better than the rest.
In simple words, the retention of the information in the beginning is better.
Therefore the correct option is primacy effect.
Learn more about primacy effect here:
https://brainly.com/question/7283471
