Biological Rhythms (Circadian Rhythms) Flashcards

1
Q

what 4 things must we remember for circadian rhythms?

A

biological rhythms
sleep/wake cycle
siffre’s cave study
other research

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2
Q

what are biological rhythms?

A

distinct patterns of changes in body activity to cyclical time periods influenced by exogenous zeitgebers and endogenous pacemakers

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3
Q

what is a circadian rhythm?

A

a biological rhythms subject to a 24 hour cycle regulating a number of body processes such as sleep/wake cycle and changes in the core body temperature

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4
Q

who has biological rhythms?

A

plants animals and people

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5
Q

why 2 things are biological rhythms governed by?

A

body’s internal biological clock - endogenous pacemakers

changes in the environment - exogenous zeitgebers

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6
Q

what is the most important exogenous zeitgeber?

A

daylight and this is shown through how we feel drowsy when it’s night-time and alert during the day

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7
Q

what is ‘free-running?’

A

if the biological clock was left to it’s own devices without the influence of external stimuli such as light

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8
Q

who tried to answer the question of ‘free-running’ and conducted research?

A

Siffre

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9
Q

what dud Siffre do?

A

spent several extended periods underground to study the effect of his bio rhy

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10
Q

how long did he spend in first 2 studies in the cave?

A
  1. 2 months in the cave of the alps
  2. 10 years later, performed similar test for 6 months in a Texan cave
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11
Q

what happened in both of Siffre’s experiments?

A

‘free-running’ biological rhythm settled down to 25 hours though he did continue to fall asleep and wake on a regular schedule

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12
Q

who found similar results to Siffre?

A

Aschoff and Wever

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13
Q

what did Aschoff and Wever do?

A

ppts spent 4 weeks in WWII bunker w/ no natural light

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14
Q

what were the findings of Aschoff and Wever experiment?

A

all but 1 ppts had circadian rhythm of 25 hrs, one had 29 hrs

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15
Q
A
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