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Neural Mechanisms Involved in Controlling Eating Behaviour

freycameron Psychology A-Level Inglés 6 fichas

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1:) Anand & Brobeck (1951) AO2 (LH)-A lesion in the LH led to aphagia in rats
-Backed up by studies where electrical stimulation of LH produced feeding behaviour in rats
2:( However... (AO2)-Not just an on switch for eating; controls other behaviours too
-Eating behaviour controlled by neural circuits, not just hypothalamus
-Furthermore, the effects of lesioning the LH were only temporary, suggesting that it is not the only 'on' switch
3:) Stanley et al (1986) AO2-Repeated injections of NPY into hypothalamus of rat produces obesity in a few days
-:) because research is scientific; cause & effect etc.
4:) AO2 (VMH)-Lesions or damage to VMH resulted in hyperphagia and obesity
-Therefore controls eating behaviour
5:( Gold (1973) AO2 (VMH)-Lesions restricted to the VMH alone did not result in hyperphagia and only produced overeating when they included other areas such as the paraventricular nucleus
-However, subsequent studies have failed to replicate this, and have found that animals with damaged VMH ate substantially more and gained more weight
6:) Physiological research AO2-Damage to amygdala could explain feeding abnormalities observed in Kluver-Bucy syndrome
-This causes increased appetite, indiscriminate eating, and attempts to eat non-food items