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Stein and Belluzzi, 1979 ). This review will focus on DA, the opioids, and ACh in the NAc shell, which so far, are the neurotransmitters that we have found to be involved with the reinforcing act math questions pdf of intermittent sugar intake. Matth It is well established that addictive act math questions pdf activate DA-containing neurons in areas of the brain that process behavior reinforcement. This was shown for drugs delivered systemically (Di Chiara and Imperato, 1988. Radhakishun et al.