GUANTANAMO BAY, Cuba - Amnesty International says the 22 hours detainees spend in their cells each day at Guantanamo Bay military prison is driving them stir-crazy.

But a Navy psychologist told the Miami Herald the Guantanamo Bay detainees are a mentally sound bunch as a whole.

Guantanamo Bay moved to a single-cell system about a year ago after a prisoner uprising, the Herald reported.

Since then, the detainees stay in their cells 22 or more hours a day, leaving for solo recreation in pens that adjoin four other fenced-in inmate recreation areas. Three meals a day are handed through slots in the doors, the Herald reported.

Officials said the detainees have gotten used to the new system.

The camp "reverberates with a great volume of conversations," Rear Adm. Harry Harris told the Herald.

"They're doing fine," Harris said.

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