A short wait can feel long while it is happening. A busy afternoon can seem to vanish, then occupy a large place in memory. These descriptions sound contradictory only if “felt duration” names one simple quantity. In practice, we can ask several different questions about the same interval.
Which experience are we describing?
First, how quickly did time seem to pass? Second, how long do you judge the interval to have lasted? Third, how finely could you distinguish events within it? These questions concern passage, estimated duration and temporal resolution respectively. An answer to one should not silently stand in for an answer to another.
There is another distinction: whether a person knows beforehand that duration will be judged. In a prospective task, attention can be directed towards timing during the interval. In a retrospective task, the person is asked afterwards and must work with whatever the experience left available.
These definitions do not guarantee a particular result. They identify what an investigation should specify. “Time felt different” is a useful beginning for a question, but too broad to serve as the complete measurement.
A surprising event
Tse and colleagues studied duration judgments for unusual stimuli embedded among repeated ones. Under their experimental conditions, an oddball stimulus could be judged longer than comparison stimuli of the same physical duration. Their experiments examined attention and novelty as part of the effect.
The interesting point is not that every surprising event must feel longer. It is that changing the perceptual context can change a duration judgment while the displayed interval remains under experimental control. The claim concerns a comparison in a task, rather than a change in the clock used to deliver the stimuli.
This suggests a useful habit when reading reports about subjective time: look for the reference interval, the response requested from participants, and the physical property held constant. Without those details, several quite different findings can sound like the same discovery.
Longer need not mean more perceptual detail
Stetson, Fiesta and Eagleman investigated the feeling that frightening events unfold in slow motion. In a controlled free-fall study, participants later judged their own fall as longer, but did not show the improvement in temporal resolution tested by the researchers' display task.
The result separates a longer retrospective estimate from an ability to resolve more rapidly changing visual information. It does not establish that every frightening experience works identically, or that one experiment exhausts the mechanisms of subjective timing.
A camera analogy can be misleading here. Recording more frames per second and playing them back at an ordinary rate creates slow-motion footage. A person's report that an event felt prolonged does not demonstrate that their perception operated as that kind of camera.
Attention, memory and the question asked
Consider two equal periods spent reading. During one, you repeatedly check a clock. During the other, you become absorbed in an argument. Afterwards you might describe their passage differently. Later still, the more memorable discussion might furnish more material for recollection.
This is an invitation to separate questions, not a promised outcome for every reader. A harmless personal exercise is to note the clock duration, your estimate immediately afterwards, and what you remember the next day. Keep those entries in separate columns. Treat the notes as observations about your own experience, not as a controlled scientific study.
The exercise becomes more revealing when the language stays precise. “I wanted it to end,” “I estimated twenty minutes,” and “I remember many distinct events” are related reports, but they do not state the same fact.
Physical time and lived time
There is no need to dismiss experience because a clock disagrees with an estimate. The disagreement is itself something to explain. Physical duration describes one aspect of the situation; attention, expectation and recollection describe processes occurring within it.
Likewise, relativity's proper time is not a name for psychological duration. Two clocks can accumulate different proper times along different journeys, even if nobody is asked how either journey felt. Conversely, two people sharing an ordinary laboratory interval can report different experiences of it.
The broad Reality project benefits from keeping these questions in conversation. The term “inner time” in Duality of Time concerns a proposed generative account of physical reality; it should not automatically be identified with introspection or an individual's subjective clock. A connection requires an explicit argument.
Carry the distinction forward
Read Music and the shaping of duration next. Music offers a setting in which measured intervals, grouping and expectation can be examined together. Then compare the time measured along a journey, where the question concerns accumulated clock readings.
Sources and further reading
- Tse, Intriligator, Rivest and Cavanagh (2004), “Attention and the subjective expansion of time,” Perception & Psychophysics 66, 1171–1189; author-hosted paper.
- Stetson, Fiesta and Eagleman (2007), “Does Time Really Slow Down during a Frightening Event?”, PLOS ONE 2, e1295.