= Executive task impurity
An <executive function> task necessarily recruits nonexecutive processes as well as its intended control demand. A verbal <Inhibitory control>[inhibition] task, for example, requires word comprehension and a response. Multiple indicators with different incidental demands can help separate common executive <variance>, but only under a defensible measurement model.<The unity and diversity of executive functions and their contributions to complex frontal lobe tasks by Akira Miyake and others>[Cognitive Psychology 41, 49–100; latent-variable analyses]{ref}
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