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. 2010 Feb;49(2):162-72.e1-5.
doi: 10.1097/00004583-201002000-00010.

Healthy adolescents' neural response to reward: associations with puberty, positive affect, and depressive symptoms

Erika E Forbes  1 , Neal D Ryan, Mary L Phillips, Stephen B Manuck, Carol M Worthman, Donna L Moyles, Jill A Tarr, Samantha R Sciarrillo, Ronald E Dahl
Affiliations

Healthy adolescents' neural response to reward: associations with puberty, positive affect, and depressive symptoms

Erika E Forbes et al. J Am Acad Child Adolesc Psychiatry. 2010 Feb.

Abstract

Objective: Changes in reward-related behavior are an important component of normal adolescent affective development. Understanding the neural underpinnings of these normative changes creates a foundation for investigating adolescence as a period of vulnerability to affective disorders, substance use disorders, and health problems. Studies of reward-related brain function have revealed conflicting findings regarding developmental change in the reactivity of the striatum and medial prefrontal cortex (mPFC) and have not considered puberty. The current study focused on puberty-specific changes in brain function and their association with mood.

Method: A sample of 77 healthy adolescents (26 pre-/early pubertal, 51 mid-/late pubertal) recruited in a narrow age range (mean = 11.94 years, SD = 0.75) were assessed for sexual maturation and circulating testosterone, completed a functional magnetic resonance imaging (fMRI) guessing task with monetary reward, and underwent experience sampling of mood in natural environments. For comparison, 19 healthy adults completed the fMRI assessment.

Results: Adolescents with more advanced pubertal maturation exhibited less striatal and more mPFC reactivity during reward outcome than similarly aged adolescents with less advanced maturation. Testosterone was positively correlated with striatal reactivity in boys during reward anticipation and negatively correlated with striatal reactivity in girls and boys during reward outcome. Striatal reactivity was positively correlated with real-world subjective positive affect and negatively correlated with depressive symptoms. mPFC reactivity was positively correlated with depressive symptoms.

Conclusions: Reward-related brain function changes with puberty and is associated with adolescents' positive affect and depressive symptoms. Increased reward-seeking behavior at this developmental point could serve to compensate for these changes.

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Figures

Figure 1
Figure 1
Developmental group differences, based on sexual maturation, in blood oxygen-level-dependent response of a) striatum and b) medial prefrontal cortex to reward outcome. Boxplots provide descriptive information on reactivity for all three developmental groups (pre/early adolescent, mid/late adolescent, and adult) at the maximum voxel for the cluster in each image. Results remained significant when outliers were removed from analyses.
Figure 2
Figure 2
Examples of associations of reward-related brain function with subjective positive affect in natural settings and with depressive symptoms. (a) Positive correlation between subjective positive affect in natural environments and caudate reactivity during reward outcome; (b) positive correlation between depressive symptoms and medial Brodmann Area 10 reactivity during reward anticipation.
See this image and copyright information in PMC

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