1. Which rhythm,1/2/3, is infradian, circadian, ultradian?

2. Circadian Rhythms

3. L.O.s Check/develop understanding of 3 biorhythms
Be able to describe and evaluate research into the circadian rhythm
Develop key skill working with others (reciprocity)

4. task Identify the biological rhythm(s) being identified
Circadian/infradian/ultradian
Label/colour-code each statement
Statements could apply to one, or more than one
Complete on own to start with
Time
Challenge – once finished, go back and add details

5. Ultradian rhythm – EG stages of sleep
Stages 1 -2 are light sleep where easily woken
Brainwave pattern changes from the awake alpha waves, to a slower, more rhythmic wave (theta wave)
Stages 3-4 involve even slower waves (delta waves) and have a greater amplitude than earlier waves.
Known as Slow-wave sleep, difficult to wake from stage 4
This stage can take up to 40 mins in first cycle
Heart rate and breathing rate drop to lowest point
Stages 1-4 = NonREM sleep

6. REM sleep occurs at the end of the first cycle
In REM the body is paralysed but brain activity speeds up similar to activity when awake
REM = rapid eye movement
REM sleep is linked to dreaming
These 5 stages together make up the sleep escalator
We progress from stage 1 down to stage 4, and then back up to 2 and then enter REM, and then go back down the escalator to 4 and back up etc
As the night progresses, time in REM increases, and time in NREM decreases, later cycles miss out 3-4

7. The sleep escalator

8. Q: How would we investigate whether exogenous zeitgebers such as daylight influence the human sleep-wake cycle? A:
Put a participant in a room with no natural daylight; allow the person to sleep and wake when they feel like it; measure the length of time for their sleep- wake cycle to occur over a period of time
See if it changes from the usual 24 hours

9. Task
Read the study you have been given
Write a summary of the study onto your booklet
Read through and highlight etc to ensure you know the study and could explain it
You will be explaining it, including the conclusion
Any questions let me know
6 minutes
Challenge: Does your study support the role of endogenous pacemakers or exogenous zeitgebers? Why?

10. Take booklet & pen
Take it in turns to explain your study to your partner
Use your booklet summary to help you
…but do not read word for word!
No need to make notes! Just listen carefully
Challenge
1) once finished, get your partner to explain it back to you (& swap)
Make notes on the other study

11. How would you criticise these studies?
Hint – research methods
Discuss with partner, make brief notes

12. Discussion What limitations are there with these studies?
Research into the sleep-wake cycle is limited because it uses case studies/small sample sizes
Participants may not be representative of all individuals’ sleep-wake cycles
Therefore may not be able to make generalisations to other people’s circadian rhythms
As a result, it lacks population validity
What do the different colours represent?

13. Evaluation p.25
Read the evaluation paragraphs
Answer Qs 1-3 that follow
10 minutes
Any questions please ask, can quietly discuss once read if need to
Q3 – annotate around, at least 3 different reasons why they are effective
Challenge: What other topic areas/research have you covered in Psychology (both years) that have
“implications for the economy”?

14. HW
Create essay plan answer for Q “Discuss research into infradian rhythm” 16 marks
6 marks ao1 of studies (inc a definition of infradian rhythm and description of eg)
10 marks AO3 – 4 points
DO NOT COPY WORD FOR WORD
Read, cover up, test yourself put in own words, repeat!
= practise-testing – more likely to remember in future
Reminder – lesson after next, assessment Qs on 2nd part of booklet – ways investigating onwards (will want to see revision notes)