Neural Mechanisms of Eating Behaviour
- Created by: BenGreaves95
- Created on: 28-02-14 12:34
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- Neural Mechanisms In Eating Behaviour.
- Homeostasis
- Detects the state of the internal environment and corrects it.
- Receptors that detect nutrient levels have insufficient data to 'turn off' eating.
- Hunger increases as glucose levels decrease.
- This triggers the lateral hypothalamus which produces feelings of hunger.
- This leads to people eating and causes their glucose to rise.
- a rise in glucose levels triggers the ventro medial hypothalamus which produces feelings of satiation.
- This then inhibits further eating.
- a rise in glucose levels triggers the ventro medial hypothalamus which produces feelings of satiation.
- This leads to people eating and causes their glucose to rise.
- This triggers the lateral hypothalamus which produces feelings of hunger.
- Lateral Hypothalamus
- Damage to the lateral hypothalamus causes aphagia which is absense of eating (in rats)
- Produces obesity in rats within a few days (Stanley et al)
- Stimulation to the lateral hypothalamus elicits feeding behaviour.
- Researchers believed they had found the 'on switch'
- Researchers found a neurotransmitter in the hypothalamus called Neuropeptide Y
- when injected into rats, it caused them to immediately begin feeding, even when satiated (Wickens)
- Damage to the lateral hypothalamus causes aphagia which is absense of eating (in rats)
- Ventromedial Hypothalamus
- Damage to ventromedial hypothalamus caused rats to overeat, this was known as hyperphagia.
- Stimulation to the ventromedial hypothalamus inhibited feeding.
- Damage to the nerve fibres passing through the ventromedial hypothalamus causes damage to the paraventricular nucleas.
- Researchers now believe damage to this alone causes hyperphagia
- Paraventricular Nuclease is responsible for food cravings.
- Researchers now believe damage to this alone causes hyperphagia
- Homeostasis
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