FIG. 1.

The simple and compound discrimination blocks of the intra/extradimensional set-shifting task (IED). Focusing specifically on cognitive/attentional flexibility, the IED task is part of the CANTAB battery of neuropsychological tests, designed to assess the integrity of frontostriatal connections. While the intradimensional (shapes are relevant) set-shifts represent lower order switching, the extradimensional (lines are relevant) set-shifts denote higher order abstract rule shifts. Color images available online at www.liebertpub.com/brain