Kashdan, T. B., Rose, P., & Fincham, F. D. (2004). Curiosity and exploration: Facilitating positive subjective experiences and personal growth opportunities. Journal of Personality Assessment, 82, 291-305.
Kashdan, T.B., Gallagher, M.W., Silvia, P.J., Winterstein, B.P., Breen, W.E., Terhar, D., & Steger, M.F. (2009). The Curiosity and Exploration Inventory-II: Development, factor structure, and initial psychometrics. Journal of Research in Personality, 43(6), 987-998.
This assessment measures: 1. Two dimensions of curiosity: appetite for novelty, and "absorbtion," e.g. the desire to want to "dig deeper" and learn more about a topic, person, activity, etc.