Summary Biopsychology A Level Endogenous pacemakers and Exogenous zeitgebers
5 views 0 purchase
Course
Biopsychology
Institution
AQA
Psychology biopsych notes that gained me an A* at A Level. I created this using textbooks, mark schemes, class notes and my own further research to provide a comprehensive set of notes. This is formatted according to the AQA psychology specification, where each point is covered, but regardless of t...
Endogenous pacemakers = internal body clock that regulates biological
rhythms
Exogenous zeitgebers = external factors which entrain our biological clock
Role of endogenous pacemakers in the sleep/wake cycle – SCN is our internal
biological clock which transfers messages to the pineal gland about if day or
night, which the pineal gland will then regulate melatonin. If no sunlight pineal
gland will produce melatonin.
Studies to support the role of the SCN:
Decoursey destroyed connections to the SCN in 30 chipmunks and returned
them to their natural habitat. Observed them for 80 days. their s/w cycle
disappeared and significant amount of them was killed due to change in
sleeping patterns. Shows SCN key role in establishing a s/w cycle.
Ralph – bred mutant hamsters to have a 20 hour sleep/wake cycle.
Transplanted DNA into normal hamsters. They also defaulted to a 20 hour s/w
cycle. Supports the role of SCN in establishing biological rhythms.
Exogenous zeitgebers
External factors which entrain our biological rhythms.
Light – can reset the SCN. Campbell and Murphy also found that light can be
detected by skin receptors e.g. on the back of the knee, causing a response
from a person.
Social cues – 6 weeks baby develop a s/w cycle. 16 weeks their s/w cycle is
entrained by their parents.
Ao3:
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 chloe79232. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.83. You're not tied to anything after your purchase.
