APA Dictionary of Psychology

the subjective estimation or experience of time. This is mainly dependent on the processing and interpretation by the brain of time-related internal or external stimuli (see time sense), but it can be influenced by other factors. In general, time is experienced as passing more slowly when one is bored or inactive and more rapidly when one is engaged in an absorbing activity. Certain peak experiences can produce a sense of time dissolving or being suspended (see timeless moment). Drugs and hypnosis can also be used to alter the perception of time. See also tachypsychia.