Endogenous pacemakers and zeitgebers
- Created by: Chanteleeeee
- Created on: 01-12-16 22:33
View mindmap
- Exogenous Zeitgebers
- external cues that play an important role in regulating biological rhythms helping to synchronise and reset them.
- EG pacemakers interact with EG zetigebers = entrainment
- free running is the opposite and the biological clock operates without external cues
- Light - found to reset the body's main pacemaker the SCN as well as other oscillators located throughout the body.
- Social cues - daily rhythms appeared to be dictated by social convention.
- We would eat meal, go to sleep and wakeup at times designated appropriate by our age and social factors.
- Social cues - daily rhythms appeared to be dictated by social convention.
- Light - found to reset the body's main pacemaker the SCN as well as other oscillators located throughout the body.
- free running is the opposite and the biological clock operates without external cues
- EG pacemakers interact with EG zetigebers = entrainment
- external cues that play an important role in regulating biological rhythms helping to synchronise and reset them.
- Social cues - daily rhythms appeared to be dictated by social convention.
- We would eat meal, go to sleep and wakeup at times designated appropriate by our age and social factors.
- CAMPBELL ET AL - demonstrated that the SCN may not be the main zeitgeber through altering circadian rhythms by shining light on the backs of Ppts knee's.
- Findings - shifted their rhythms demonstrating that other oscillators must exist that compensate by keeping the biological clocks in tune.
- May be that blood is the messenger that carries signals across the body
- Findings - shifted their rhythms demonstrating that other oscillators must exist that compensate by keeping the biological clocks in tune.
- Endogenous Pacemakers
- biological clocks that are generated from within organisms.
- In mammals, the main pacemaker is a tiny cluster of cells called suprachiasmatic nucleus located in the hypothalamus.
- SCN receives info on light and sends signals to the pineal gland which then regulates the production melatonin.
- Induces sleep and inibits brain mechanisms promoting wakefulness.
- Lights inhibits melatonin production
- Induces sleep and inibits brain mechanisms promoting wakefulness.
- SCN receives info on light and sends signals to the pineal gland which then regulates the production melatonin.
- In mammals, the main pacemaker is a tiny cluster of cells called suprachiasmatic nucleus located in the hypothalamus.
- biological clocks that are generated from within organisms.
- RALPH ET AL - group of hamsters with genetic abnormality that results in a 20 hour circadian cycle
- SCNs were removed and placed in the brains of experimental group of hamsters
- experimental group shifted to a 20 hour cycle.
- Lacked ecological validity
- experimental group shifted to a 20 hour cycle.
- SCNs were removed and placed in the brains of experimental group of hamsters
Comments
No comments have yet been made