The charge by Ramzi bin al Shibh came yesterday as he angrily explained to the military judge in his case why he did not want to attend the afternoon session on the second day of a weeklong pretrial hearing at the US base in Cuba.
"It is a form of psychological torture," he said.
The judge, Army Col James Pohl, has been allowing the five defendants to skip sessions of their pretrial hearings, but he has said they will be required to attend their actual trial, which is likely at least a year away. The other four defendants had already decided not to come to court yesterday.
The allegation from bin al Shibh, a Yemeni accused of aiding the hijackers in the Sept 11, 2001, attack, was a rare lively moment in a day that was otherwise devoted to lengthy arguments over aspects of a protective order that governs the handling of classified evidence in the complex terrorism trial.
Lawyers for the five prisoners believe the rules as written make it harder for them to mount a defence based around the men's harsh treatment while in CIA custody. The arguments were expected to continue today.