Biological Rhythms
Post-mortem studies investigating sleeping sickness in WW2 highlighted the
hypothalamus has a main role in sleep-wake regulation. What happens when there
is a lesion in the posterior hypothalamus?
a) Insomnia
b) Parasomnia
c) Sleeplessness
d) Excessive sleep
Post-mortem studies investigating sleeping sickness in WW2 highlighted the
hypothalamus has a main role in sleep-wake regulation. What happens when there
is a lesion in the anterior hypothalamus?
a) Parasomnia
b) Sleeplessness
c) Narcolepsy
d) Sleep apnoea
A study was conducted in cats to isolate areas of the brain which may be involved in
sleep and wakefulness (Bremner, 1937). Two areas in the brain, A and B, are
involved in the sleep-wake cycle and in between these areas is the reticular
activating system. What is area A known as and what does a lesion cause?
a) Cerveau isolé produces a continuous sleep like state
b) Encéphale isolé maintains a continuous sleep like state
c) Encéphale isolé maintains sleep wake cycles
d) Cerveau isolé maintains sleep wake cycles
What is area B known as and what happens when there is a lesion?
a) Encéphale isolé maintains sleep wake cycles
b) Encéphale isolé maintains a continuous sleep like state
c) Cerveau isolé maintains sleep wake cycles
d) Cerveau isolé produces a continuous sleep like state
How does the reticular activating system maintain the sleep-wake cycle?
a) The area between A and B includes a sleep centre (reticular formation
(RF)/reticular activating system (RAS)) which can actively rouse the cortex
independent of external stimuli
b) The area between A and B includes a sleep centre (reticular formation
(RF)/reticular activating system (RAS)) which can actively rouse the cortex
dependent of external stimuli
c) The area between A and B includes a sleep centre (reticular formation
(RF)/reticular activating system (RAS)) which inhibits the cortex dependent of
external stimuli
d) None of the above
Post-mortem studies investigating sleeping sickness in WW2 highlighted the
hypothalamus has a main role in sleep-wake regulation. What happens when there
is a lesion in the posterior hypothalamus?
a) Insomnia
b) Parasomnia
c) Sleeplessness
d) Excessive sleep
Post-mortem studies investigating sleeping sickness in WW2 highlighted the
hypothalamus has a main role in sleep-wake regulation. What happens when there
is a lesion in the anterior hypothalamus?
a) Parasomnia
b) Sleeplessness
c) Narcolepsy
d) Sleep apnoea
A study was conducted in cats to isolate areas of the brain which may be involved in
sleep and wakefulness (Bremner, 1937). Two areas in the brain, A and B, are
involved in the sleep-wake cycle and in between these areas is the reticular
activating system. What is area A known as and what does a lesion cause?
a) Cerveau isolé produces a continuous sleep like state
b) Encéphale isolé maintains a continuous sleep like state
c) Encéphale isolé maintains sleep wake cycles
d) Cerveau isolé maintains sleep wake cycles
What is area B known as and what happens when there is a lesion?
a) Encéphale isolé maintains sleep wake cycles
b) Encéphale isolé maintains a continuous sleep like state
c) Cerveau isolé maintains sleep wake cycles
d) Cerveau isolé produces a continuous sleep like state
How does the reticular activating system maintain the sleep-wake cycle?
a) The area between A and B includes a sleep centre (reticular formation
(RF)/reticular activating system (RAS)) which can actively rouse the cortex
independent of external stimuli
b) The area between A and B includes a sleep centre (reticular formation
(RF)/reticular activating system (RAS)) which can actively rouse the cortex
dependent of external stimuli
c) The area between A and B includes a sleep centre (reticular formation
(RF)/reticular activating system (RAS)) which inhibits the cortex dependent of
external stimuli
d) None of the above
