Fig. 2.

Putative relationships between consciousness, environmental connectedness, and responsiveness (C-EC-R). Illustrative examples are shown pertaining to sleep (top ellipse), general anesthesia (bottom ellipse), and disorders of consciousness (middle ellipse). Note that this is not an exhaustive mapping of all possible states of altered consciousness; likewise, this framework does not directly address the question of quantifying residual cognitive function, as this can only be properly assessed in responsive patients. Also note that the relative size of the colored circles is not intended to reflect relative prevalence