[Title] Iroise Dumontheil Sam Gilbert Sarah-Jayne Blakemore Institute of Cognitive Neuroscience, UCL UCL Changes in recruitment of rostral prefrontal cortex during development

[Title] UCL Match shape Match change Smith, Keramatian & Christoff 2004 A, B, C, D, ?, ?, ?, ?, I, J, K Switch - Stay z = 4 Gilbert et al. 2005, 2008 Increase with age in children (8-12 y.) Adults > Children Crone et al. In press Does the recruitment of lateral rostral PFC change during adolescence ?

[Title] UCL Shapes task: (Smith, Keramatian & Christoff 2007) - Factors: Relational or Control (shapes or texture) -20 blocks, alternating Control and Relational blocks -1s instruction, 32s block -Relational blocks: 8 trials x 4s (max 3.5s + 0.5s blank) -Control blocks: 10 trials x 3.2s (max 2.8s + 0.4s blank) Subjects Females, right handed, adolescents: 18 x 11-16y, adults: 12 x 20-30y ShapeTextureChange Alphabet task: (Gilbert and colleagues) - Factors: Block type: SO/SI, Trial type: Switch/Stay/Other -Duration of the SO/SI block varying from 3 to 20 seconds, average ~7seconds -Self-paced -4 blocks of ~2min with short breaks in between / run Y, Z, A, B, C, D, E, F, G, M, Z, F, X, T, E, A, O, P, Q, R, S, T SO SI Switch Stay

[Title] [Investigators & Affiliations] UCL  Females, right handed Adolescents: 18 x 11-16y, adults: 12 x 20-30y  Three functional runs: Shapes - 11min, Alphabet – 2 x 8min Structural: Joe’s Flash sequence – 2 x 6min  Shapes: Blocked Alphabet: Mixed design (SO/SI blocks, switch/stay events)  Shapes analysis : Relational vs Control x Age Alphabet analysis : SI vs SO x Age, Switch vs Stay x Age  Brain coverage: 30 slices, TR=3s, TE=50ms, 3x3x3mm