Invisible Children filmmaker Jason Russell, who created the viral "Kony 2012" video, will remain in the hospital for several weeks for what his wife described as "reactive psychosis."

In a statement released Wednesday, his wife and other family members said they believe this condition caused him to act strangely last week, ranting and roaming around a San Diego street in the nude.

The family said the treatment could take months.

"Jason will get better," they said. "He has a long way to go, but we are confident that he will make a full recovery. He is, and will remain, under hospital care for a number of weeks; and after that, the recovery process could take months before he is fully able to step back into his role with Invisible Children. During that time, we will focus not on a speedy recovery, but a thorough one."

They said doctors are treating Russell for "brief reactive psychosis, an acute state brought on by the extreme exhaustion, stress and dehydration," the family said. "Though new to us, the doctors say this is a common experience given the great mental, emotional and physical shock his body has gone through in these last two weeks."

Russell, 33, was taken into custody Thursday afternoon by San Diego police after neighbors reported him running naked in the streets of a Pacific Beach neighborhood, pounding his fists on the sidewalk and shouting incoherently. Police took him to a mental-health facility for observation.

Police responded to "several callers [who] reported that the male removed his underwear and was nude, perhaps masturbating," according to the police statement. By the time police arrived, the man was wearing underwear.