Duration refers to the time that events last. If we think of
tempo as the speed of events, then duration is the speed of
the clock itself. For the physicist, the duration of a “second”
is precise and unambiguous: it is equal to 9,192,631,770
cycles of the frequency associated with the transition
between two energy levels of the isotope cesium-133. In the
realm of psychological experience, however, quantifying
units of time is a considerably clumsier operation. When
people are removed from the cues of “real” time ─ be it the
sun, bodily fatigue, or timepieces themselves ─ it doesn’t
take long before their time sense breaks down. And it is this
usually (A) __________ psychological clock, as opposed to the
time on one’s watch, that creates the perception of duration
that people experience.
Theoretically, a person who mentally stretches the duration
of time should experience a slower tempo. Imagine, for
example, that baseballs are pitched to two different batters.
The balls are thrown every 5 seconds for 50 seconds, so a
total of 10 balls are thrown. We now ask both batters how
much time has passed. Let’s say that batter number one (who
loves hitting) feels the duration to be 40 seconds. Batter
number two (bored by baseball) believes it to be 60 seconds.
Psychologically, then, the first person has experienced
baseballs approaching every four seconds while the second
sees it as every six seconds. The perceived tempo, in other
words, is (B) __________ for batter number one.
* isotope: 동위원소 ** clumsy: 서투른