Motivation plays an important role in memory. In a similar experiment, participants were asked to identify the correct 'head' side of a penny. Although this information is exposed to us daily, that does not necessarily mean it is retained. This could be because there is a lack of motivation to store information about such a small amount of money. What is the main reason for the lack of retention of information about the 'head' side of a penny?
1) Lack of interest in small amounts of money
2) Difficulty in identifying the 'head' side of a penny
3) Lack of exposure to information about the 'head' side of a penny
4) Lack of motivation to store information about such a small amount of money