Biological Rhythums: Circadian Rhythums Flashcards
Outline- biological rhythms
Distinct changes in body activity that conform to cycle periods. Biological rhythms are influenced by internal body clocks (endogenous pacemakers) aswell as exogenous zietgebers
Outline- circadian rhythm
Rhythms that occur once every day e.g. Sleep
Outline- sleep wake cycle
When we feel drowsy when it’s night time and alert during the day, Demonstrates the effect of day light as its an exogenous zietgeber.
Outline- siffre’s cave study
- he lived in a deep cave for a period of 6 months.
- deprived of natural sunlight and sound, but access to adequate food and drink
- his biological rhythms are left to their own accord to control his sleep wake cycle.
Results- his cycle was 25 hours long as oppose to our usual 24 hours, though he continued to fall asleep and wake up on a regular basis
Outline- Jürgen Ashcroft et al (1976)
- group of participants spend 4 weeks in a world war 2 bunker deprived of natural sunlight.
- all but 1 displayed a sleep wake cycle of 24/25 hours, the anomaly had about 29 hours.
- suggests that the natural sleep wake cycle is slightly longer than the normal 24 hours.
Evaluation- practical application to shift work
Found night workers engaged in shift work experience a period of reduced concentration around 6 in the morning meaning mistakes are more likely.
Evaluation- poor control in studies
-they had artificial light which may be an exogenous zietgeber just like sunlight is .
Outline- biological rhythms
Distinct changes in body activity that conform to cycle periods. Biological rhythms are influenced by internal body clocks (endogenous pacemakers) aswell as exogenous zietgebers
Outline- circadian rhythm
Rhythms that occur once every day e.g. Sleep
Outline- sleep wake cycle
When we feel drowsy when it’s night time and alert during the day, Demonstrates the effect of day light as its an exogenous zietgeber.
Outline- siffre’s cave study
- he lived in a deep cave for a period of 6 months.
- deprived of natural sunlight and sound, but access to adequate food and drink
- his biological rhythms are left to their own accord to control his sleep wake cycle.
Results- his cycle was 25 hours long as oppose to our usual 24 hours, though he continued to fall asleep and wake up on a regular basis
Outline- Jürgen Ashcroft et al (1976)
- group of participants spend 4 weeks in a world war 2 bunker deprived of natural sunlight.
- all but 1 displayed a sleep wake cycle of 24/25 hours, the anomaly had about 29 hours.
- suggests that the natural sleep wake cycle is slightly longer than the normal 24 hours.
Evaluation- practical application to shift work
Found night workers engaged in shift work experience a period of reduced concentration around 6 in the morning meaning mistakes are more likely.
Evaluation- poor control in studies
-they had artificial light which may be an exogenous zietgeber just like sunlight is .
