Using the Laptops…  Follow the instructions on page 6 of your workbook

Biological Rhythms A2 Psychology – PSYA3 Introduction to Biological Rhythms and Sleep

Connect… What kind of rhythms or cycles do we experience in our lives?????

Objectives… By the end of this lesson you should be able to…  Understand the exam requirements of this topic  Distinguish between different types of biological rhythms

What is a biological rhythm?  The human body has rhythms and cycles that occur regularly e.g:  Menstrual cycle  Sleep-wake cycle  Body temperature etc.  We don’t always know why our cycles occur in the way that they do:  Changes in environment?  Natural body clock?

Biological Rhythms Ultradian Rhythms Take less than 24 hours E.g. the Sleep Stages cycle Circadian Rhythms Take just 24 hours E.g. the Sleep –wake cycle Infradian Rhythms Take longer than 24 hours E.g. the menstrual cycle

Ultradian rhythms Research by…. Berger Dement & Kleitman

External control: Modification by Zeitgebers Endogenous control: Pacemaker (SCN) Research by: Fulton and Bailey (tumors) Jouvet (rats) Inouye and Kawamoura (rats) Ralph et al (mutant hamsters) Research by: Michel Siffre (cave) Aschoff & Wever (bunker) Circadian rhythms

rZrA

Menstrual cycle : Endogenous control Pacemaker = pituitary gland Regular production of hormones (FSH and LH) by the pituitary gland over a 28 day period, causes regular thickening and shedding of the uterus wall, together with ovulation (egg maturation and release) Modification by external Zeitgebers 1. Russell et al. – donor pheromones on lips of female test participants Infradian Rhythms Modification by external Zeitgebers 2. McClintick et al. – the effect of male pheromones

 Complete the activities on pages 7 and 8