Neural Mechanisms in Eating Behaviour

Revision tool

HideShow resource information
  • Created by: Kerri
  • Created on: 04-12-12 22:07
Preview of Neural Mechanisms in Eating Behaviour

First 338 words of the document:

Neural Mechanisms in eating behaviour
AO1 ­ Body detects state of internal environment and restores to optimal state (2 systems on/off)
AO2 ­ Not adaptive response it responds rather than prevents so cannot be explained by evolution
AO2 ­ To become adaptive it must promote levels of consumption that keep above the optimal level
as a buffer against future lack of food
Lateral Hypothalamus (on)
AO1 ­ Decline in glucose levels activates LH causing hunger
AO2 ­ Wickens (2000) Injecting NPY (found in LH) into rats causes them to eat even when satiated
AO2 ­ Marie et al (2005) Mice with no NPY made no diff to eating behaviour, behaviour from
injections does not reflect that caused by normal amounts
AO2 ­ Animal ethics, can't give informed consent etc.
AO2 ­ Yang (2008) RWA) people still eat too much because the abdominal fat as well as brain
produces NPY ­ vicious cycle: NPY > fat cells > NPY > more fat cells. Prevent obesity by giving drugs
which turn off NPY to those at risk of increased NPY
AO2 ­ Deterministic, those with high levels of NPY become obese and nothing they can do about it
Ventromedial Hypothalamus (off)
AO1 ­ When we consume food, increase in glucose levels activates VH causing satiation
AO2 ­ Gold (1973) damage to nerve fibres in VH damages Paraventricular nucleus too. Now thought
damage to PVN alone causes hyperphagia (overeating)
AO2 ­ However, not just neural causes, stress = extra ghrelin (hormone) which boosts appetite,
problematic as it defeats benefits against stress
AO2 ­ Zhang et al (1994) some mice have more than one obese gene (ob/ob) which increases
appetite, defect of hormone/protein leptin which decreases appetite, injecting them with leptin
caused them to lose weight dramatically RWA) leptin as a treatment for those with predisposition to
AO2 ­ Reductionist, does not account for evolutionary or psychological factors in eating behaviour
such as famine for our ancestors or stress


No comments have yet been made

Similar Psychology resources:

See all Psychology resources »See all resources »