Inhibitory Control of a Rewarding Stimulus under Different Reward and Distractor Conditions: A fMRI Study
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1
University of Melbourne, Australia
Previous behavioural studies have identified the importance of attention to inhibition of impulsive responses to rewarding stimuli. The current study examined the neural basis for this phenomenon, testing whether distraction assists response inhibition over rewarding stimuli, and whether the distraction strategy is only helpful under conditions where response inhibition over an alluring target yields benefit. Twenty-one healthy participants (13 females; M = 24.7 years, SD = 4.9) were administered a Go/No-Go task during functional magnetic resonance imaging data collection, that employed small immediate rewards, large delayed or no delayed reward outcomes, and high or low distractors. Results indicated a significant interaction effect between delayed reward conditions and level of distraction, p=.022, ηp2=.235. For the delayed-reward condition, the level of inhibition accuracy was greater for high-distraction compared to low-distraction trials. For the no-delayed-reward condition, there was no difference in inhibition accuracy for level of distraction. Comparisons of BOLD activity of No-Go trials between conditions showed hypoactivity in reward-related dorsal striatal regions, and hypoactivity in superior temporal gyri which have been associated with shifts of attention to pertinent features of target stimuli. Present findings suggest shifts of attention are important for successful resistance to alluring stimuli for future benefit. Furthermore, perceived lack of future benefit may undermine self-control in some cases.
Acknowledgements
Contributions by Catherine Orr, Sarah Rossiter, Richard Nibbs, Kathleen Charles-Walsh and Kevin Murphy. The research was supported by ARC DP1092852.
Keywords:
response inhibition,
Functional Neuroimaging,
superior temporal gyri,
dorsal striatum,
right inferior frontal gyrus
Conference:
ACNS-2012 Australasian Cognitive Neuroscience Conference, Brisbane, Australia, 29 Nov - 2 Dec, 2012.
Presentation Type:
Oral Presentation
Topic:
Executive Processes
Citation:
Scalzo
F,
O'Connor
DA and
Hester
R
(2012). Inhibitory Control of a Rewarding Stimulus under Different Reward and Distractor Conditions: A fMRI Study.
Conference Abstract:
ACNS-2012 Australasian Cognitive Neuroscience Conference.
doi: 10.3389/conf.fnhum.2012.208.00105
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Received:
25 Oct 2012;
Published Online:
07 Nov 2012.
*
Correspondence:
Dr. David A O'Connor, University of Melbourne, Melbourne, Australia, doconnor@isc.cnrs.fr