BIOLOGICAL RHYTHMS

Question 1

What are Biological Rhythms?

Answer 1

any variable physiological process with phases that reoccur periodically

Question 2

types of rhythms

Answer 2

circannval
Infradian
Circadian
Ultradian

Question 3

Early views of Sleep (endogenous vs exogenous)

Answer 3

early view was exogenous, Pavlov would say that rhythms are classically conditioned responses

Question 4

Present view of sleep (endogenous vs exogenous)

Answer 4

Mairon’s famous experiment

findings support that circadian regulation is endogenous control

Question 5

Processes that occur under Circadian Rhythm

Answer 5

body temp drops
growth hormones released during slow wave sleep
cortisol levels spike when sleeping
absorption of drugs

Question 6

Chronotypes differences

Answer 6

younger people prefer evenings while older people prefer morning

Question 7

What are the two big life changes that occur that change circadian rhythm

Answer 7

becoming a teen, preferring evenings

40-50 years go back to morning

Question 8

Findings from Moore study (1972)

Answer 8

when SCN is destroyed there is no pattern

Question 9

Findings from Ralph study (1990)

Answer 9

SCN transportation

found that transplants when putting back SCN into the brain there is rhythm in activity

Question 10

Forced Desyachrony Protocol

Answer 10

28- hr and 24 hr day
7 nights and days (24hrs)
de-synchronized sleep and wake rhythm (28 hrs)

Question 11

Hurd and Ralph study (Ex 1)

Answer 11

forced desynchrony: imposed 24hr cycle and 20 hr hamsters

died 7 months earlier (30% reduction)

Question 12

Hurd and Ralph Study (EX 2)

Answer 12

older hamsters
implanted SCN tissue from younger hamsters causing them to live longer
extended life span by 17%

Question 13

Two process model of Sleep Regulation

Answer 13

Process C (ircadian)
Process S (leep)

Question 14

Are sleep drive and want different?

Answer 14

yes