Abstract
Putting money at stake produces anticipatory uncertainty, a process that has been linked to key features of gambling. Here we examined how learning and individual differences modulate the stimulus preceding negativity (SPN, an electroencephalographic signature of perceived uncertainty of valued outcomes) in gambling disorder patients (GDPs) and healthy controls (HCs), during a non-gambling contingency learning task. Twenty-four GDPs and 26 HCs performed a causal learning task under conditions of high and medium uncertainty (HU, MU; null and positive cue-outcome contingency, respectively). Participants were asked to predict the outcome trial-by-trial, and to regularly judge the strength of the cue-outcome contingency. A pre-outcome SPN was extracted from simultaneous electroencephalographic recordings for each participant, uncertainty level, and task block. The two groups similarly learnt to predict the occurrence of the outcome in the presence/absence of the cue. In HCs, SPN amplitude decreased as the outcome became predictable in the MU condition, a decrement that was absent in the HU condition, where the outcome remained unpredictable during the task. Most importantly, GDPs’ SPN remained high and insensitive to task type and block. In GDPs, the SPN amplitude was linked to gambling preferences. When both groups were considered together, SPN amplitude was also related to impulsivity. GDPs thus showed an abnormal electrophysiological response to outcome uncertainty, not attributable to faulty contingency learning. Differences with controls were larger in frequent players of passive games, and smaller in players of more active games. Potential psychological mechanisms underlying this set of effects are discussed.
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Notes
The difference in perceived problems associated to alcohol use favored GDPs, which is probably attributable to the fact that all GDPs were in treatment at the moment of assessment, and therapeutic guidelines include completely refraining from drinking alcohol. In any case, in spite of the significant between-group difference, the MultiCAGE-alcohol score did not significantly correlate with any of the dependent variables of the study (max. r= −0.182, p = 0.21).
As noted earlier, the SPN analysis was also carried out excluding left-handed participants. This analysis yielded a similar Block × Uncertainty × Group significant interaction, F(1, 41) = 5.386, p < 0.03. Additionally, Electrode interacted with Block, F(8, 328) = 1.967, p < 0.05, and with Group and Block, F(8, 328) = 2.894, p < 0.01. These interactions imply that handedness could be influencing signal distribution across electrodes, but did not affect the distribution of the effects attributable to the difference between the two uncertainty conditions (for interactions involving electrode and uncertainty, min. p = 0.17).
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Acknowledgements
We thank Jesús Vetia for designing the graphics used for the task.
Funding
Research described in this paper has been funded by a grant to the research group from the Spanish Government (Ministerio de Economía y Competitividad, Secretaría de Estado de Invetigación, Desarrollo e Innovación; Convocatoria 2013 de Proyectos I+D de Excelencia), with Reference Number PSI2013-45055-P. JFN and APG have been awarded with individual research grants (Ministerio de Educación, Cultura y Deporte, Programa FPU, reference number FPU13/00669; and Programa de Becas de Iniciación a la Investigación para estudiantes de másteres oficiales del Plan Propio de Investigación de la Universidad de Granada, 2016, respectively). JCP is member of a RETICS (RD12/0028/0017) group, funded by the Spanish Ministerio de Sanidad y Consumo.
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Megías, A., Navas, J.F., Perandrés-Gómez, A. et al. Electroencephalographic Evidence of Abnormal Anticipatory Uncertainty Processing in Gambling Disorder Patients. J Gambl Stud 34, 321–338 (2018). https://doi.org/10.1007/s10899-017-9693-3
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DOI: https://doi.org/10.1007/s10899-017-9693-3