This difference between believers and disbelievers, known as the "sheep-goat effect," has been confirmed by many other researchers. A meta-analysis by Lawrence (1992), covering 73 experiments by 37 different researchers, clearly confirms that subjects who believe in psi obtain, on the average, higher results than those who do not believe in it.

We all tend to select information which confirms our beliefs and avoid that which seems not to fit with them. Selective perception undoubtedly plays a role in our interpretation of apparently paranormal experiences. Skeptics are justified in stating that those who believe firmly in psi will tend to see its occurrence everywhere, even to the point of confusing their own interpretations with the actual events. On the other hand, disbelievers will also tend toward the complementary fallacy, always finding some so-called "rational" explanation for a psi experience, even when it happens to them. But the sheep-goat effect suggests that the differences run deeper than mere interpretation: one's attitudes toward psi affects the likelihood that such phenomena will occur in the first place. The more an individual harbors a reductionistic view of the world, the less chance such phenomena will emerge (let alone be witnessed by them); the more one is interested in interconnectedness, and open to psi experiences, the more likely the world will "respond" by creating such experiences.

Additional Experimental Evidence:
Relating ESP to personality traits: Two meta-analyses