Key points are not available for this paper at this time.
In an experiment on cancelling letters in English prose the relationship between output and degree of introversion was found to depend both on the time of day at which the task was performed and on the social situation in which subjects were tested. Performance correlated positively with introversion in morning test sessions when subjects were isolated from each other, but when testing was in the afternoon, or when subjects worked together in a group, this relationship was destroyed. The results are discussed in relation to an arousal theory of introversion‐extraversion.
Colquhoun et al. (Thu,) studied this question.