Abstract
Complementary neuronal recordings, and functional neuroimaging in humans, show that the primary taste cortex in the anterior insula provides separate and combined representations of the taste, temperature, and texture (including fat texture) of food in the mouth independently of hunger and thus of reward value and pleasantness. One synapse on, in the orbitofrontal cortex (OFC), these sensory inputs are for some neurons combined by associative learning with olfactory and visual inputs, and these neurons encode food reward in that they only respond to food when hungry and in that activations correlate with subjective pleasantness. Cognitive factors, including word-level descriptions, and selective attention to affective value modulate the representation of the reward value of taste and olfactory stimuli in the OFC and a region to which it projects, the anterior cingulate cortex, a tertiary taste cortical area. The food reward representations formed in this way play an important role in the control of appetite and food intake. Individual differences in these reward representations may contribute to obesity.
Published Version
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