The way in which Dr. Pickhardt describe and/or differentiate between the three types of crushes is:
This refers to the feelings of infatuation which occurs to a person where he likes a person usually for a short period of time.
With this in mind, we can see that Dr Pickhardt stated the different types of crushes which a person has and the universal similarity between all three according to him is that they were all a projection of his ideal image.
Read more about Dr Pickhardt here:
https://brainly.com/question/11452148