The love and hate at first sight happen for something that psychoanalysis called "transfer" (positive or negative).
We all know who tried to commit genocide Adolf Hitler with the Jews living in Germany when he came to power.
We all know, and even justify, that the Jews of all generations and from around the world to the Nazi leader have the worst memories.
Now imagine the existence of a person who has very similar physical features to the hated character, who lives in Israel and, worse, pronounced the official language (Hebrew or Arabic) with a German tone.
It is easy to assume that this person is not very nice fall, which hardly inspires love at first sight and that their social life is full of obstacles.
With this example we can understand what in psychoanalysis is called "transfer", ie, the inevitable tendency to award to another person roles, features, certain psychological profile, purely occurrence of who makes the transfer. In the example, each person to whom you feel discomfort resembles Hitler feel the trouble because, inevitably, is assigning features that he keeps in his inner world over the pathetic historical character.
Sure I put an example of negative transfer, but there are positive transfers.
With these it is exactly the opposite: we fall in love with someone who looks wonderful because something that evokes person who, in our inner world, we love, admire, idealize.
These awards are so uncontrollable, capricious and unconscious, that psychotherapists use them to understand the patient's inner world.
The therapist is alert to how the patient, for example, accuses him of being too harsh and unjust when he ... awarding fees increases (the therapist) the role of their own hateful father.
Note: Original in Spanish (without translation by Google): Amor y odio a primera vista.
(Este es el Artículo Nº 1.981)