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Hunger and satiety Hunger and satiety in anorexia nervosa:
in anorexia nervosa:fMRI during cognitive processing of food picturesSantel et al., 2006
Maria Zuluaga
Bsc Psychology
14’
Brief overview0Anorexia nervosa- what is it?0Mental disorder0Fear of gaining weight0Mostly seen in adolescents (14 years
old)0More frequent in women-0amenorrhea (endocrine disorder)
0Lower activation in certain brain areas helps to maintain fasting
Introduction
0Objective: to test the different effects of visual stimuli of food on healthy and anorexic people.
0BUT- making a distinction between:0A Hungry state0A Satiated state
Hypothesis
0In anorexic patients- weaker activation in:0Inferior parietal lobe (IPL)0Occipital cortex
0Higher activation in:0Medial prefrontal cortex
Experimental Task020 practice trials08 am- 2 sessions (30 min)08 consecutive blocks 10
stimuli (colored pictures)0 food (320)0 non food (320)
Is the pictureA)Pleasant
B)Neutral
C)unpleasant
Results0Are you hungry?0Higher response when
hungry (both).0Anorexics had a lower
report overall.
0Anorexic- less pleased by food stimuli.
0Fmri- 0Anorexics (satiated)-
lower activation on IPL0 (-) correlation with
stornger dietary restrain.0 (+) correlation with
weaker disinihbition of eating and low BMI.
0Anorexic (hungry)- decreased activation of occipital cortex.
Discussion0Lower activation on IPL0This area controls: 0Appetite0Food related behaviors0Satiation
0Contains primary somatosensory neurons for body parts involved in eating.
0Facilitates fasting
0Lower occipital cortex activation0Attentional motivation0Focus on food stimuli when hungry to maintain
fasting
01° and 2° visual areas- importance of stimuli0Lower activation when anorexic patient was
hungry.
Strengths & Limitations
0Clear explanations0 Procedure0 Results
0Great build up on background information
0Sample size0 Non compliance
0Organization0 Hard to follow
Opinion
0Easy to understand overall0Explains why some behaviors may arise. (makes
sense)0Comparison to obese people
Enjoy what you have, it’s beautiful!