TY - JOUR
T1 - The decimal effect
T2 - Behavioral and neural bases for a novel influence on intertemporal choice in healthy individuals and in ADHD
AU - Fassbender, Catherine
AU - Houde, Sebastien
AU - Silver-Balbus, Shayla
AU - Ballard, Kacey
AU - Kim, Bokyung
AU - Rutledge, Kyle J.
AU - Dixon, J. Faye
AU - Iosif, Ana Maria
AU - Schweitzer, Julie B.
AU - McClure, Samuel M.
N1 - Publisher Copyright:
© 2014 Massachusetts Institute of Technology.
PY - 2014/11/1
Y1 - 2014/11/1
N2 - We identify a novel contextual variable that alters the evaluation of delayed rewards in healthy participants and those diagnosed with attention deficit/hyperactivity disorder (ADHD). When intertemporal choices are constructed of monetary outcomes with rounded values (e.g., $25.00), discount rates are greater than when the rewards have nonzero decimal values (e.g., $25.12). This finding is well explained within a dual system framework for temporal discounting in which preferences are constructed from separate affective and deliberative processes. Specifically, we find that round dollar values produce greater positive affect than do nonzero decimal values. This suggests that relative involvement of affective processes may underlie our observed difference in intertemporal preferences. Furthermore, we demonstrate that intertemporal choices with rounded values recruit greater brain responses in the nucleus accumbens to a degree that correlates with the size of the behavioral effect across participants. Our demonstration that a simple contextual manipulation can alter self-control in ADHD has implications for treatment of individuals with disorders of impulsivity. Overall, the decimal effect highlights mechanisms by which the properties of a reward bias perceived value and consequent preferences.
AB - We identify a novel contextual variable that alters the evaluation of delayed rewards in healthy participants and those diagnosed with attention deficit/hyperactivity disorder (ADHD). When intertemporal choices are constructed of monetary outcomes with rounded values (e.g., $25.00), discount rates are greater than when the rewards have nonzero decimal values (e.g., $25.12). This finding is well explained within a dual system framework for temporal discounting in which preferences are constructed from separate affective and deliberative processes. Specifically, we find that round dollar values produce greater positive affect than do nonzero decimal values. This suggests that relative involvement of affective processes may underlie our observed difference in intertemporal preferences. Furthermore, we demonstrate that intertemporal choices with rounded values recruit greater brain responses in the nucleus accumbens to a degree that correlates with the size of the behavioral effect across participants. Our demonstration that a simple contextual manipulation can alter self-control in ADHD has implications for treatment of individuals with disorders of impulsivity. Overall, the decimal effect highlights mechanisms by which the properties of a reward bias perceived value and consequent preferences.
UR - http://www.scopus.com/inward/record.url?scp=84907462252&partnerID=8YFLogxK
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U2 - 10.1162/jocn_a_00642
DO - 10.1162/jocn_a_00642
M3 - Article
C2 - 24738767
AN - SCOPUS:84907462252
SN - 0898-929X
VL - 26
SP - 2455
EP - 2468
JO - Journal of Cognitive Neuroscience
JF - Journal of Cognitive Neuroscience
IS - 11
ER -