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Neural and physiological reactivity to drug cues predicts important behavioral outcomes, such as smoking cessation Janes et al. We hypothesized that individual differences in NAcc activity in response to viewing food items and sexual scenes would predict future weight gain and sexual behavior. Demos, Ph. One reason that people may be prone to engaging in unwanted behaviors is because of heightened sensitivity to cues related to those behaviors; people may overeat because of hyper responsiveness to food cues, addicts may relapse following exposure to their drug of choice, and some people might engage in impulsive sexual activity because they are easily aroused by erotic stimuli. An open question is the extent to which individual differences in neural cue reactivity relate to actual behavioral outcomes. Does such reactivity predict long-term outcomes for non-drug behaviors? Kathryn E. Task instructions were simply to indicate whether a person was present in the image. Here we show that individual differences in human reward-related brain activity in the nucleus accumbens to food and sexual images predict subsequent weight gain and sexual activity six months later. Prior to scanning, participants were weighed under the guise that it was a necessary step in the scanning procedure. It was hypothesized that activity in the NAcc would reflect individual differences in appetitive behaviors i. Neuroimaging studies assessing reactivity to appetitive cues have consistently observed activation of human reward circuitry, including ventral striatum and amygdala Passamonti et al. For example, obese women exhibit greater activity in the nucleus accumbens NAcc , in response to high calorie food items than do healthy-weight control subjects Stoeckel et al. Some of the images of people depicted people in sexual scenes or consuming alcohol. Likewise, cues of physical attractiveness activate NAcc in both men and women Cloutier et al. Six months later, 48 of the participants returned to the laboratory where they were again weighed, and completed questionnaires assessing their sexual behavior.
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We hypothesized that individual differences in NAcc activity in response to viewing food items and sexual scenes would predict future weight gain and sexual behavior. Does such reactivity predict long-term outcomes for non-drug behaviors? Neuroimaging studies assessing reactivity to appetitive cues have consistently observed activation of human reward circuitry, including ventral striatum and amygdala Passamonti et al.
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