OSRAM light quiz – how does our internal clock tick
Light Quiz – Internal clock
Light acts as a pacemaker for the internal clock of humans. This internal clock coordinates all bodily functions in a 24-hour rhythm. With Human Centric Lighting, biologically effective light is used to synchronize the day/night rhythm and thus the internal clock. But what happens when humans are deprived of this pacemaker and have to live without any daylight? In the 1960s, volunteers lived for several weeks in a bunker under scientific supervision to find an answer. The bunker was equipped with all amenities – however, there was no daylight at all and also no clock to show the time. The test persons therefore went to sleep when they wanted to and got up when they woke up.
Question: How did the internal clock of the test persons change?
a) The internal clock did not change, the course of day and night stayed almost the same.
b) The length of the day became shorter for all test persons.
c) The day/night rhythm became longer.
Answer c) is correct: The day/night rhythm became longer.
The "bunker experiment" resulted in the following: Every human being has a circadian internal clock that also functions without any information from the outside world. Although each of the test persons developed its own individual sleep/wake rhythm, the average rhythm of the test persons became longer – not around 24 but rather around 25 hours. This means that no internal clock ticks like the other.