Thomas and Cooper  found those who score high on the Intolerance of Ambiguity Scale of Templer's Death Anxiety Scale  were less likely to report mystical experiences, suggesting that "those who reported a spiritual experience where significantly more open to new experiences."
- Thomas, L. Eugene, and Pamela E. Cooper. “Incidence and Psychological Correlates of Intense Spiritual Experiences.” Journal of Transpersonal Psychology 12, no. 1 (June 1980): 75.
- Templer, Donald I. “The Construction and Validation of a Death Anxiety Scale.” Journal of General Psychology 81, no. 2 (April 1970): 165.