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http://dx.doi.org/10.3389/fnins.2010.00190 (Publisher version)
id10003997.pdf (Publisher version), 746KB
Ruff, D. A., Marrett, S., Heekeren, H. R., Bandettini, P. A., & Ungerleider, L. G. (2010). Complementary roles of systems representing sensory evidence and systems detecting task difficulty during perceptual decision making. Frontiers in Neuroscience, 4: 190. doi:10.3389/fnins.2010.00190.