Neural mechanisms in eating behaviour

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  • Created by: Gemma
  • Created on: 20-04-14 16:47
Role of the Lateral Hypothalamus?
To cause eating - when glucose levels get too low
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What is homeostasis?
Involves mechanisms which both detect + control the state of the internal environment. There is a time lag btwn detection + equilibrium
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How was the role of the LH discovered?
Damage to the LH causes aphragia which is an absence of eating, so the role of the LH must be the opposite
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Sakurai et al
damage to the LH affects other areas of behavior e.g. sex + thirst so can't be 'eating centre'
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Role of the Ventromedial Hypothalamus
To stop eating - when glucose levels are too high . Damage to fibres in VMH also causes damage in another area of hypothalamus - PVN
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How was the role of the VMH discovered?
Damage to the VMH causes hyperphagia which means overeating
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Gold
Damage to the Paraventricular Nucleus alone causes hyperphagia
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What else is found within the LH?
Neuropeptide Y which is important in stimulating eating
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Wickens et al
Injected rats with NPY + found that they overate significantly more
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Stanley et al
Injected rats with NPY and found that within a week the rats were obese
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What is the role of the amygdala?
Involved in the preference of food based on previous experiences
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Rolls + Rolls
Surgically removed the amygdala in rats + found that they ate both familiar + non-familiar food
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Yang et al
Not only does LH produce NPY but also abdominal fat cells , which causes their weight to increase further
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An implication?
From Yang et al's research - could leave room for a drug to be produced which could block NPY receptors in order to help an overweight person lose weight
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Negative of the implication?
People will become over-reliant + passive ==> link to free -will
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Card 2

Front

What is homeostasis?

Back

Involves mechanisms which both detect + control the state of the internal environment. There is a time lag btwn detection + equilibrium

Card 3

Front

How was the role of the LH discovered?

Back

Preview of the front of card 3

Card 4

Front

Sakurai et al

Back

Preview of the front of card 4

Card 5

Front

Role of the Ventromedial Hypothalamus

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