Cognitive control researchers aim to describe the processes that support adaptive cognition to achieve specific goals. Control theorists consider how to influence the state of systems to reach certain user-defined goals. In brain networks, some conceptual and lexical similarities between cognitive control and control theory offer appealing avenues for scientific discovery. However, these opport...

To the Editor:—I have concern about the article entitled “Performance Characteristics of Five New Anesthesia Ventilators and Four Intensive Care Ventilators in Pressure-support Mode: A Comparative Bench Study,” which appeared in the November 2006 issue of ANESTHESIOLOGY. Several statements made in the article are incorrect, and we appreciate an opportunity to set the record straight. In table 1...

SHARPE [12] AND LINTNER [7] have recently proposed models directed at the following questions: (a) What is the appropriate measure of the risk of a capital asset? (b) What is the equilibrium relationship between this measure of the asset's risk and its one-period expected return?^ Lintner contends that the measure of risk derived from his model is different and more general than that proposed b...

As regards the power calculation, a change in eight units in PRIT is what can reasonably be expected from any 'treatment' for pain judging from previous clinical trials using this outcome measure. The statistical power was, as recommended, at least 80% in order to detect a reasonable departure from the null hypothesis: this power level is not, in fact, asking healing to be more effective than a...