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Substance P (SP) and neurotensin (NT) are neuropeptides isolated in the periphery and in the central nervous system. They are involved in various regulatory processes in the gastrointestinal tract, in the circulatory and respiratory systems, kidney and endocrine system. In addition to the peripheral effects, SP and NT act as neurotransmitters and neuromodulators in the central nervous system, regulating...
Successful adaption requires learning to respond appropriately to cues associated with response-reinforcer contingencies. In this investigation, we used functional magnetic resonance imaging to characterize changes in frontal and limbic activation associated with learning under a positive reinforcement contingency. Imaging analyses identified linear and nonlinear changes in brain activation across...
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