Childhood anxiety disorders affect approximately one in ten children resulting in marked social impairment. These individuals also carry a heightened risk for mood and anxiety disorders in adulthood, rendering this a public health issue relevant to the entire lifespan. Work to date characterizing the pathophysiology of anxiety disorders has focused on one sphere of anxious symptoms- hypersensitivity to cues of potential threat such as emotional faces or negative images (e.g., phasic responses), while biological markers for other key symptoms of anxiety, such as sustained hypervigilance and arousal (e.g., tonic responses), remain relatively unexplored. The objectives of this program of research are: 1) to delineate the typical development of brain systems involved in phasic and tonic processes that map onto threat processing and vigilance, 2) to provide preliminary evidence for their differential roles in representing tonic anxious phenotypes characteristic of generalized anxiety disorder;and 3) to test their predictive merit for risk in familial cases. The proposed work will first use functional neuroimaging and psychophysiology to characterize the functional properties of brain networks that mediate tonic and phasic symptoms of anxiety in a cross-sectional, typically developing sample (K phase). Then, deviant neural and behavioral signatures will be identified in a sample of individuals with pediatric Generalized Anxiety Disorder (GAD), a clinical syndrome marked by chronic apprehension and vigilance (K phase). Using these samples, we will assess whether biobehavioral markers of GAD are also evident in a sample of children at heightened risk for developing anxiety disorders based on family history (R phase). To accomplish these objectives, the candidate will receive extensive training in testing pediatric and clinical populations bolstered by education in developmental and clinical neuroscience, and advanced neuroimaging techniques including resting-state connectivity, diffusion tensor connectivity and network modeling methodologies. This work and training will prepare the candidate for initiating an independent laboratory capable of developmental, clinical and advanced neuroimaging research. Irrespective of the observed findings, this work will serve as a natural precursor to future R01 funding applications to track high-risk individuals longitudinally and/or utilize identified biomarkers in clinical research evaluating new therapies targeting the tonic system and its associated chronic anxious symptomatology. This work is progressing toward the ultimate goal of identifying predictive markers of risk for anxiety disorders that will facilitate early identification and prevention.

Public Health Relevance

Childhood anxiety disorders affect as many as one in ten children and confer a heightened risk for psychiatric disorders throughout the lifespan. The objective of work is expand our understanding of brain systems critical to different symptoms of anxiety by characterizing the neurobiological mechanisms of threat biases and vigilance across development. Brain networks that mediate these symptoms are predicted to play distinctive roles in the pathophysiology of anxiety disorders and will be evaluated for their predictive merit in identifying individuals at heightened risk for anxiety disorders based on family history. Ultimately, this work should provide biologically valid behavioral markers of risk for anxiety disorders that will facilitate early identification as well as new outcome measures for clinical trials for optimizing personalized treatment.

Agency
National Institute of Health (NIH)
Type
Research Transition Award (R00)
Project #
5R00MH087813-05
Application #
8694093
Study Section
No Study Section (in-house review) (NSS)
Program Officer
Garriock, Holly A
Project Start
Project End
Budget Start
Budget End
Support Year
5
Fiscal Year
2014
Total Cost
Indirect Cost
Name
Harvard University
Department
Psychology
Type
Schools of Arts and Sciences
DUNS #
City
Cambridge
State
MA
Country
United States
Zip Code
02138
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Powers, Katherine E; Somerville, Leah H; Kelley, William M et al. (2013) Rejection sensitivity polarizes striatal-medial prefrontal activity when anticipating social feedback. J Cogn Neurosci 25:1887-95
Somerville, Leah H; Jones, Rebecca M; Ruberry, Erika J et al. (2013) The medial prefrontal cortex and the emergence of self-conscious emotion in adolescence. Psychol Sci 24:1554-62
Somerville, Leah H; Wagner, Dylan D; Wig, Gagan S et al. (2013) Interactions between transient and sustained neural signals support the generation and regulation of anxious emotion. Cereb Cortex 23:49-60