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The [[value]] of the reward is signaled by the plesentness or pain of the reward. The magnitude of the reward will be determined by the volume of the of nuronal signaling that is connected to the reward and the intensety of nuronal firing. The amount of siganling, is due to the learning process [[LTP]] and [[STP]]. It will be composed of the chance for the expected results, and the immdiacy. the higher the chances, and the more immidate the results is axpected to be, the stronger the signal will be.
Pain and plesure are not equal. For most of the people, pain will cause more repalsion then plesure will cause attraction. This is due to the hazardous nature of pain. This may be the neuronal mechanism behind [https://en.wikipedia.org/wiki/Loss_aversion [loss aversion]]. The reward attraction function seems to be the basic mechanisms of the [https://en.wikipedia.org/wiki/Prospect_theory prospect theory].
[[File:Attraction.png|500px|center|The reward-attraction function model]]