Contact Experiment

Contact Experiment is a term used to describe the process in which a human has contact with any Adam oriented being. This process is what causes the subject's soul to be drawn into the Evangelions. Known subjects are Yui Ikari with Evangelion Unit-01 and Kyoko Zeppelin Soryu with Evangelion Unit-02. There was also a Contact Experiment between a human and Adam that initiated Second Impact.

Adam & Second Impact

Before Second Impact it is stated that someone had a Contact Experiment with Adam. According to a sound clip there was a Contact Experiment scheduled with an unnamed donor on the "13th of the next month". This Contact Experiment is what initiates the beginning of Second Impact where the DNA that was inserted into Adam becomes physically fused. It is never stated who the donor was.

Yui Ikari & Evangelion Unit-01

In 2004, Yui agrees to take place in a Contact Experiment with Eva-01. Mysterious circumstances causes her to be "erased from this world". However, it is later revealed that Yui's soul was completely absorbed into Unit-01. In Episode 20 it is also stated by Ritsuko that there had been a salvage operation 10 years ago when her mother worked there. Presumably this operation had been carried out in order to rescue Yui from Eva-01, but according to Ritsuko, "I heard they failed".

Kyoko Zeppelin Soryu and Evangelion Unit-02

Unlike Yui's experiment, Kyoko's does not cause her soul to be completely absorbed into Unit-02. Rather, only an aspect of her soul resides in Unit-02 - the part that loves her daughter above all else. However, due to her soul being split, Kyoko goes insane and later commits suicide, leaving Asuka alone.

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