...the findings challenge the common perception that psychological torture is less distressing than physical torture. "Implicit in this distinction is a difference in the distressing nature of the events. The evidence takes issue with that," he says. "And since psychological torture is as bad as physical torture, we shouldn’t use it." (New Scientist)
All I can say is: "duh". How can anyone think mock execution, starvation, or rape threats are ok?
The US psychological torture system is finally on trial.
To understand the effects of trauma, I recommend Judith Lewis Herman's Trauma and Recovery.