Other slides in this set

Slide 2

Preview of page 2

Here's a taster:

Biological Rhythms
Circadian ­ 24 hour cycle
Sleep/Wake Cycle
Ultradian ­ more than once every 24 hours
Sleep cycle
Heart beat
Infradian ­ less than once every 24 hours
Menstrual Cycle
Circannual ­ Annual cycle
Migration
Hibernation…read more

Slide 3

Preview of page 3

Here's a taster:

Control of Biological Rhythms
Exogenous Zeitgebers
external factors that influence biological rhythms
Endogenous Pacemakers
Biological clock which are influenced by exogenous zeitgebers
Regulates rhythms within the body…read more

Slide 4

Preview of page 4

Here's a taster:

Circadian Rhythm ­ Sleep/Wake Cycle EZ'
s and EP's
FOR MAMMALS
Connected by
Light falls on retina of
optic nerve to
eye
hypothalamus
SCN causes pineal
- EZ gland to increase
- EP serotonin and decrease
melatonin
Melatonin induces sleep
Person wakes
up…read more

Slide 5

Preview of page 5

Here's a taster:

Research on EP
MORGAN
Research
Removed SCN from hamsters
Caused them to lose circadian rhythm
Transplanted SCN back to hamsters
Circadian rhythm was re-established
Evaluation of Research
· Did show SCN acting as an EP
· Ethical issues
· Cannot be generalised to humans
· Lacks ecological validity…read more

Slide 6

Preview of page 6

Here's a taster:

Research on EP
SCHOCHAT
Research
Lab study
Measured melatonin and sleepiness in participants
Every 20 minutes for 29 hours
Found ­ melatonin was secreted 2 hours before highest level of sleepiness
Evaluation of Research
· Conducted on human participants
· Successfully shows melatonin as an EP
· Lacks ecological validity…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Slide 10

Preview of page 10
Preview of page 10

Comments

No comments have yet been made

Similar Psychology resources:

See all Psychology resources »See all resources »