Abstract
Rationale

Biased processing of drug-associated stimuli is believed to be a crucial feature of addiction. Particularly, an attentional bias seems to contribute to the disorder's maintenance. Recent studies suggest differential effects for stimuli associated with the beginning (BEGIN-smoking-stimuli) or the terminal stage of the smoking ritual (END-smoking-stimuli), with the former but not the later evoking high cue-reactivity.
Objective

The current study investigated the neuronal network underlying an attentional bias to BEGIN-smoking-stimuli and END-smoking-stimuli in smokers and tested the hypothesis that the attentional bias is greater for BEGIN-smoking-stimuli.
Methods

Sixteen non-deprived smokers and 16 non-smoking controls participated in an fMRI study. Drug pictures (BEGIN-smoking-stimuli, END-smoking-stimuli) and control pictures were overlaid with geometrical figures and presented for 300 ms. Subjects had to identify picture content (identification-task) or figure orientation (distraction-task). The distraction-task was intended to demonstrate attentional bias.
Results
Behavioral data revealed an attentional bias to BEGIN-smoking-stimuli but not to END-smoking-stimuli in both groups. However, only smokers showed mesocorticolimbic deactivations in the distraction-task with BEGIN-smoking-stimuli. Importantly, these deactivations were significantly stronger for BEGIN- than for END-smoking-stimuli and correlated with the attentional bias score.
Conclusions
Several explanations may account for missing group differences in behavioral data. Brain data suggest smokers using regulatory strategies in response to BEGIN-smoking-stimuli to prevent the elicitation of motivational responses interfering with distraction-task performance. These strategies could be reflected in the observed deactivations and might lead to a performance level in smokers that is similar to that of non-smokers.




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Acknowledgements
The study was supported by the German Research Foundation (DFG): Forschergruppe ‘Emotion and Behaviour’ (STA475/5-1) and the Graduiertenkolleg ‘NeuroAct’.
Ronald F. Mucha has in the past invested in a venture to market pictures of the end of smoking to symbolize smoking with little craving. This could be perceived as a conflict of interest, although this study was conceived and carried out independent of this. The remaining authors do not have any conflict of interest, financial or otherwise, which might bias this work.
We thank Sabine Kagerer for her indispensable language support. We further thank Sophia Rohrbeck and Annette Kroiß for assistance in data collection and analysis.
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Stippekohl, B., Walter, B., Winkler, M.H. et al. An early attentional bias to BEGIN-stimuli of the smoking ritual is accompanied with mesocorticolimbic deactivations in smokers. Psychopharmacology 222, 593–607 (2012). https://doi.org/10.1007/s00213-012-2670-8
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DOI: https://doi.org/10.1007/s00213-012-2670-8
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