Solve it.

• Why did our manipulations fail to isolate the activity in these regions? • Explanation 1: These regions are not functionally distinct as characterized by ACT-R • Explanation 2: Our task manipulations failed to properly isolate retrieval and transformation • We designed two ACT-R models to determine the plausibility of Explanation 2 • Pure Model: Encompassed our initial assumptions about the design but failed to fit the RT data (R2 = .50) • Mixed Model: Assumed that both manipulations had retrieval and transformation components and fit the RT data well (R2 = .94) Using Cognitive Modeling to Understand the Roles of Prefrontal and Posterior Parietal Cortex in Algebra Problem Solving Jared F. Danker & John R. Anderson Department of Psychology and Center for the Neural Basis of Cognition, Carnegie Mellon University

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