The ability to estimate time durations was tested in participants who were established to be either introverted or extroverted by the Eysenck Personality Inventory. Participants refrained from looking at time informative devices while they estimated the duration of a time-interval between seven and thirty minutes long. The time at which the trials took place was based on the behavioural theory of timing and the internal clock theory. An interaction between personality type and the time of day was predicted, although only a difference in the performance of personality types was found to be significant. Extroverts performed better overall which was interpreted to suggest that humans use behavioural cues when estimating time.
"Timing Abilities in Introverts and Extroverts,"
The Huron University College Journal of Learning and Motivation:
1, Article 15.
Available at: http://ir.lib.uwo.ca/hucjlm/vol45/iss1/15