Psychologist Stuart Vyse has pointed out that until about 2010, "[m]ost researchers assumed superstitions were irrational and focused their attentions on discovering why people were superstitious." Vyse went on to describe studies that looked at the relationship between performance and superstitious rituals. Preliminary work has indicated that such rituals can reduce stress and thereby improve performance, but, Vyse has said, "...not because they are superstitious but because they are rituals....