Sackler Institute for Developmental Psychobiology Weill Medical College of Cornell University.

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Sackler Institute for Developmental Psychobiology Weill Medical College of Cornell University

BJ Casey, Ph.D., Sackler Professor and Director Sackler Institute for Developmental Psychobiology Weill Medical College of Cornell University Insights into the Adolescent Brain from Functional Neuroimaging Studies

Key Points 1)Examine developmental progressions in terms of transitions into and out of adolescence rather than single snap shot in time; 2)Examine individual differences within a developmental stage in terms of potential risk and/or resilience factors.

Sackler Institute For Developmental Psychobiology Weill Medical College of Cornell University Sackler Fellows *Adriana Galvan (now at UCLA) *Todd Hare Rebecca Jones *Conor Liston Fatima Soloman Liat Levita Staff Sarah Getz and Alex Millner *Julie Spicer (now at Columbia) Faculty Dima Amso Nim Tottenham Henning Voss *Sarah Durston (Utrecht) *Inge-Marie Eigsti (U Conn) Gary Glover (Stanford) Walter Mischel (Columbia) Funded in part by R01 MH63255, P50 MH62196, R21 DA15882, R01 DA018879, NSF , the Mortimer D. Sackler family and Dewitt-Wallace Reader’s Digest.

Overarching Question How is the brain changing during adolescence that may explain behavioral changes during this period?

Dramatic developmental changes in prefrontal and subcortical regions during adolescence Subcortical limbic regions involved in motivational behavior (Sowell et al, 1999) Focus has typically been on prefrontal cortex (PFC) Sowell et al 1999 Nature Neuroscience

Functional Maturation Adolescence Prefrontal Cortex Protracted Development of Prefrontal Control Regions Earlier Development of Subcortical Limbic Regions

Functional Maturation Adolescence Limbic regions (accumbens) Prefrontal Cortex Protracted Development of Prefrontal Control Regions Earlier Development of Subcortical Limbic Regions

Thirty-seven participants 12 adults (mean age:25 years; 6 female) 12 adolescents (mean age:16 years; 6 female) 13 children (mean age: 9 years; 7 female) Reward = = Cue = Assessment of Developmental Differences in Response to Rewarding Events

Participants are faster on trials that give the largest reward.

* * Imaging Results Adolescents are similar to adults in volume of accumbens activity BUT similar to children in prefrontal activity.

Protracted development of the OFC relative to the accumbens Normalized Extent of Activity Age in years Galvan et al 2006 J Neuroscience

Neural recruitment differs by region for age groups and corresponds to enhanced activity in the accumbens in adolescents Nucleus Accumbens Orbital Frontal Cortex No of Interpolated Voxels (mm3) * Nucleus AccumbensOrbital Frontal Cortex Peak % MR Signal Change * * * * Volume of Activity Children Adolescents Adults

-Differential development of subcortical relative to prefrontal control regions may explain increased engagement in high risk, incentive driven behaviors. Rate of Maturation Adolescence Different Developmental Trajectories accumbens/amygdala prefrontal cortex

Age (years) % MR Signal Change Individual variability in accumbens activity across development

Accumbens activity is correlated with risky behavior Galvan et al 2006 Developmental Science

Increased risking taking behavior in adolescence may be related to differential development of limbic subcortical vs. cortical control regions. Developmental changes may be exacerbated by individual differences in tendency to engage in risky behavior. Impulsive and risky behavior Rate of Maturation Adolescence accumbens prefrontal cortex

Is there a similar pattern in the amgydala to negative events? Monk et al 2003 Neuroimage

500 ms Emotional Go/Nogo Task 500 ms ,500 ms Hare et al 2005 Bio Psychiatry

Enhanced activity in amygdala in adolescents relative to children & adults when approaching negative information Age in Years

Emotional Reactivity to Empty Threat: initial reactivity versus sustained reactivity earlymiddlelate Early Trials Middle Trials Late Trials

Sustained amygdala activity (late - early trials) Habituation of Amygdala Response to empty threat related to Trait Anxiety (i.e., decrease in activity from early to late trials) Trait Anxiety Score

Functional Connectivity Between Prefrontal Regions and Amygdala is associated with Habituation of Amygdala Response

Changes in behavior during adolescence paralleled by differential development of subcortical limbic regions relative to prefrontal control regions. Individual differences in responses to positive or negative events, together with these developmental changes may put certain teens at risk for poor outcomes. Maturation Adolescence Conclusions accumbens/amygdala prefrontal cortex

Imaging the Adolescent Brain… Groovy

Sackler Institute for Developmental Psychobiology Weill Medical College of Cornell University