biopsych

Question 1

wt r endogenous pacemakers

Answer 1

• endo= inside
• genous= producing
• internal body clock that a keeps biological processes to time

Question 2

wt r exogenous Zeitgebers

Answer 2

• exo= outiside
• zeitgeber= time giver
• these are external cues that entrain internal body clocks, meaning altering body clocks that match environment

Question 3

wts a circadian rhythm & examples

Answer 3

• biological rhythm that lasts around 24hrs
• regulating sleep and wake up every 24hr
• releasing hormones
• varying body temp & blood pressure

Question 4

wt keeps a circadian rhythm continuing and wt r some conflicting things w these

Answer 4

• internal body clock = endogenous pacemaker
• conflicts can b light & social cues e.g jet lag
• endogenous pm will b entrained by exogenous zeit 2 new time zone

Question 5

wt is the endogenous pacemaker for the sleep wake cycle

Answer 5

• supachiasmtic nucelus SCN
• aka master clock
• part of hypothalamus within limbic system
• located at optic chasm

Question 6

wt does SCN do

Answer 6

• endogenous pacemaker 4 sleep wake cycle
• when light is detected by SCN sends light 2 pineal gland stopping production of melatonin= hormone resulting in sleep response

Question 7

wts the primary exogenous zeitberg in sleep wake cycle

Answer 7

• light
• social cues e.g time we eat meals or exercise act as ez

Question 8

EVIDENCE for free running circadian rhythm natural light isolation study & AO3

Answer 8

• siffre spent 6months in cave w no natural light or other potential EZs such as clocks/social cues/ differ body block ENDOGPM
• maintained regular cycle of around 25hrs w out EZs. longer than the expected 24hr cycle.
• suggesting EP 4 sleep wake cycle is free running but needs entrainment 2 keep 2 the 24hr day night cycle

AO3= criticism:

• psychologists say use of artificial light in isolation exp on sleep wake cycle disrupt measurements of free running circadian rhythm as they act as EXOYGNEOUS ZEITBERG.
• in a study controlling for artififcla light czeisler who controlled this variable found circadian rhythm was closer to 24hr w little drift

Question 9

wt does less light do to our SCN

Answer 9

• SCN stimulates pineal gland 2 stimulate more melatonin 2 help us fall asleep