Czeisler Et Al Flashcards
(10 cards)
What was the aim of the study preformed by czeisler et al
To test wether bright light exposure would help nightshift workers adapt to daytime sleeping
When was the nightshift study by czeisler et al preformed
1990
Describe the participants used in Czeisler et al’s study
8 men between the ages of 22-29 years old that had no experience with nightshifts
What was asked of the participants in Czeisler et al’s study
To refrain from alcohol and caffeine
How were the results measured in Czeisler et al’s study
The participants did cognitive tests
Report on their mood and alertness
Core body temperature was recorded over the course of the study
How was the study preformed in Czeisler et al’s study
The experimental group was exposed to very bright light during the nightshifts and complete darkness during the day and the control group vice versa
What was the results of Czeisler et al’s study
The experimental group had their circadian rhythms shifted by 9 hours
The experimental group slept 2 hours longer than the control group
The experimental group had better alertness post bright light exposure compared to no bright light
The experimental group’s melatonin production peaked at noon
What is the conclusion of Czeisler et al’s study
Exposure to a routine of light and dark will induce a complete physiological adaptation to night work
What are the strengths of Czeisler et al’s study
Gives insight to the psychological effect of night working
Completed in a laboratory so variables were controlled far more reliably
A cause and effect relationship can easily be established
What are the weaknesses of Czeisler et al’s study
A sample size of 8 does not accurately represent the larger population
Due to all participants being male it cannot be ascribed to the larger population
Due to the age range being biased it cannot be generalised to the larger population
Ecological conditions were not representative of normal routines e.g waking up at night to complete tests
