I also asked them if they ever had the same thoughts as their twin. The first pair said yes –for example, one of them often started talking about what the other one was thinking. Strangely, the other pair disagreed about whether this was true. One of the twins said that her sister would take the words out of her mouth, while the other said this never happened to her.
The most interesting thing for me was studying the results of the psychological part of the test. I asked them to describe their personality using twelve different pairs of sentences. I found that each twin gave almost identical answers to her sister!