There was a study done based on positive and negative energy.
3 bowls of rice, one was told I love you, one was told I hate you and the third was completely ignored.
The first bowl of rice was just fine, the second one looked like it was expired, and the final bowl which was ignored was completely rotten.
A lot can be said about being ignored
I have read about these type of experiments top, and yeah getting ignored can be a very painful thing.