The reason why Mimi persisted in searching for the biscuit under the red cup is because of the object permanence method and the A-not-B method. Mimi’s father kept putting the biscuit under the red cup, but when he put it under the yellow cup she did not attend closely when it was hidden at a new spot. The reason why Mimi kept choosing the red cup is because she had the habit of reaching of the red cup and she is continuing to look at the red cup and the red cup only. Since Mimi didn’t move around when looking at the cups this will increase Mimi’s chance of making the A-not-B search error. Mimi doesn’t bother to look under the yellow cup, because of the constant looking under the red cup. These motor skills can become challenging to babies,
