My mother had the softest touch--she'd lay a hand on someone's arm and the fight would cease. She was an operating room nurse, and she'd ease fear away with that touch, too.
I think it's "Therapeutic Touch" (created by a nurse) that transmits healing energy through laying on of hands. Tohei had a similar system.
I am trying to study more of the energy medicines and finding the relaxed "let" of touch transmits the emotional content. So what we think and feel while doing Aikido makes a great difference.