Zur Seitenansicht
 

Titelaufnahme

Titel
Risk assessment and reward processing in problem gambling investigated by event-related potentials and fMRI-constrained source analysis
VerfasserMiedl, Stephan F ; Fehr, Thorsten ; Herrmann, Manfred ; Meyer, Gerhard
Erschienen in
BMC Psychiatry, London, 2014, Jg. 14, H. 229, S. 1-10
ErschienenBioMed Central, 2014
SpracheEnglisch
DokumenttypAufsatz in einer Zeitschrift
Schlagwörter (EN)EEG / Addiction / Decision-making
Zugriffsbeschränkung
 Das Werk ist frei verfügbar
Dateien
Risk assessment and reward processing in problem gambling investigated by event-related potentials and fMRI-constrained source analysis [0.83 mb]
Links
Nachweis
Klassifikation
Zusammenfassung (Englisch)

Background: The temporo-spatial dynamics of risk assessment and reward processing in problem gamblers with a focus on an ecologically valid design has not been examined previously. Methods: We investigated risk assessment and reward processing in 12 healthy male occasional gamblers (OG) and in 12 male problem gamblers (PG) with a combined EEG and fMRI approach to identify group-differences in successively activated brain regions during two stages within a quasi-realistic blackjack game. Results: Both groups did not differ in reaction times but event-related potentials in PG and OG produced significantly different amplitudes in middle and late time-windows during high-risk vs. low-risk decisions. Applying an fMRI-constrained regional source model during risk assessment resulted in larger source moments in PG in the high-risk vs. low-risk comparison in thalamic, orbitofrontal and superior frontal activations within the 600-800 ms time window. During reward processing, PG showed a trend to enhanced negativity in an early time window (100-150 ms) potentially related to higher rostral anterior cingulate activity and a trend to centro-parietal group-differences in a later time window (390-440 ms) accompanied by increased superior-frontal (i.e., premotor-related) source moments in PG vs. OG. Conclusions: We suggest that problem gambling is characterized by stronger cue-related craving during risk assessment. Reward processing is associated with early affective modulation followed by increased action preparation for ongoing gambling in PG.