Summary
Summary Psychology 16 Marker Revision - Endogenous and Exogenous Factors
- Course
- Institution
16 Marker Template including all information about the topic (plus Studies and Evaluation points.)
[Show more]
Seller
Follow
Leahhhh2003
Content preview
SECTION: Endogenous Pacemakers and Exogenous ZeitgebersTOPIC: Biopsychology
Endogenous Pacemakers - Internal body clock that regulates biological rhythms.
Suprachiasmatic Nucleus SCN – Located in the hypothalamus the structure receives light information and adjusts
bodily activities. With a higher light exposure, the SCN will control the release of melatonin, reduced the amount
but at night the release of melatonin increases causing drowsiness.
Animal Study: In 1990, Ralph et al, bred hamsters with the sleep/wake cycle of 20 hours, he then transplanted
their SCN into the brains of regular hamsters and found the regular hamsters cycle changed from 24 hours to 20
hours.
Exogenous Zeitgebers – External factors that entrain our biological rhythms.
Light – It plays a role in the sleep/wake cycle, with the ability to reset the SCN. Indirect impacts also occur on
hormone release and blood circulation.
Social Cues – Schedules imposed by everyday demands including mealtimes can entrain the body into a regular
24 hour sleep/wake cycle.
Research into jet lag found that adapting straight away to local meal times and sleep is an effective way to re-set
the circadian rhythm.
WEAKNESS:
- Difficulty of investigation – factors cannot be totally isolated in studies of EP. Even in Siffre’s cave study, he used artificial
light which could’ve impacted his cycle. Also, in everyday life the body clocks work together and therefore there may be
no need to separate them to investigate them.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Leahhhh2003. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.91. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81298 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now