The study tested the ability of 21 TT practitioners to detect the HEF when they were not looking. Rosa asked each of the practitioners to sit at a table and extend their hands through a screen. On the other side of the screen, Rosa randomly selected one of the TT practitioners' hands and held her own hand over it. The TT practitioners were then asked which of their hands detected Rosa's HEF. Subjects were each given ten tries, but they correctly located Rosa's hand an average of only 4.4 times. Some subjects were asked before testing to examine Rosa's hands and select which of her hands they thought produced the strongest HEF. Rosa then used that hand during the experiment, but those subjects performed no better. The results showed that TT practitioners could not detect the hand more often than chance, and Rosa and her co-authors therefore concluded that there was no empirical basis to the HEF and by extension therapeutic touch: