BELLEFONTE, Pa. -- Jerry Sandusky won a court ruling Friday that will let him have an expert testify about a psychiatric condition that his lawyer says helps explain letters he wrote to his accusers and other actions being construed as him grooming victims.

Judge John Cleland granted a motion that sought to put evidence of "histrionic personality disorder" before jurors in Sandusky's child sexual abuse case.

Cleland's order also said the former Penn State assistant football coach must make himself available for prosecutors so they can prepare rebuttal psychiatric testimony.

The American Psychiatric Association's diagnostic manual calls histrionic personality disorder "a pervasive pattern of excessive emotionality and attention seeking" and "often characterized by inappropriate sexually seductive or provocative behavior" and rapidly shifting emotions.

The defense motion said people with the condition would not necessarily be grooming boys to molest them but instead might be trying to "satisfy the needs of a psyche" with the disorder.

"The jury should not be misled into believing these statements and actions are likely grooming when they are just as likely or more likely histrionic in origin," wrote defense attorney Karl Rominger in the June 11 filing.

Testimony in the 68-year-old former coach's criminal trial is expected to resume Monday. He faces 52 charges he abused 10 boys over 15 years. He has denied the allegations, which led to the ouster of the university president and its longtime coach, Joe Paterno.

Dr. Glen Gabbard, clinical professor of psychiatry at Baylor College of Medicine in Houston, said histrionic personality disorder is overwhelmingly diagnosed in women and could in no way be seen as a reason or explanation for the abuse of children.

"That diagnosis, if he has it, would be completely irrelevant to anything having to do with criminal responsibility for acts of pedophilia," said Gabbard, who is an expert on personality disorders.

"It would make no sense to use this as a defense," said Gabbard, noting he could not diagnose Sandusky. "You are still very much in control of what you do and what you say."

The diagnosis involves someone who suffers highly emotional shifts from one state to another, he said, someone who is overly dramatic, seductive and likes being the center of attention. The classic example, Gabbard said, would be Marilyn Monroe.

"These are people who act like your friend when they just barely met you," he said.

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  • Jerry Sandusky

    Role: Former assistant football coach and founder of The Second Mile charity for children, accused of molesting boys over a 15-year period. Background: Arrested in November after a long investigation by a statewide grand jury. He had been a very successful defensive coach for the Nittany Lions for 30 years, and prosecutors say he used his fame in the community to attract victims. Charges: Involuntary deviate sexual intercourse, indecent assault of a young child, unlawful contact with minors, corruption of minors, endangering the welfare of children. Status: Awaits trial, with jury selection scheduled for Tuesday.

  • Dottie Sandusky

    Role: Married to Jerry Sandusky. Background: Dottie Sandusky has stood by her husband, posting his bail, accompanying him to court proceedings and issuing a statement in December that proclaimed his innocence and said accusers were making up stories. She is not charged.

  • Tim Curley

    Role: Penn State athletic director, on leave while he fights criminal charges for actions related to the Sandusky scandal. Background: Curley fielded a complaint about Sandusky in a team shower with a boy in early 2001, and told a grand jury he instructed Sandusky not to be inside Penn State athletic facilities with any young people. Charges: Failure to properly report suspected child abuse and perjury for lying to the grand jury. He's not on trial with Sandusky, denies the allegations and is seeking to have the charges dismissed.

  • Gary Schultz

    Role: Penn State vice president for business and finance, now retired. Background: Schultz told the grand jury that head coach Joe Paterno and assistant Mike McQueary reported the 2001 shower incident "in a very general way" but did not provide details. Charges: Failure to properly report suspected child abuse and perjury for lying to the grand jury. He's not on trial with Sandusky, denies the allegations and is seeking to have the charges dismissed.

  • Mike McQueary

    Role: Assistant Penn State football coach. Was a graduate assistant in 2001, when he says he witnessed Jerry Sandusky and a boy naked together in a team shower. McQueary took his complaint to Paterno, who alerted university administrators. Background: McQueary testified at a court hearing in December that he "believed Jerry was sexually molesting" the boy and "having some type of intercourse with him."

  • Joe Amendola

    Role: Defense attorney for Jerry Sandusky. Background: Amendola has been second-guessed for allowing Sandusky to go on network television and speak at length with a reporter for The New York Times after his arrest. Has won several legal battles for Sandusky, including getting him released on bail and fighting the prosecution's effort to have the case heard by a jury from outside the State College area. His office is in State College.

  • Karl Rominger

    Role: Another defense attorney for Jerry Sandusky. Background: Rominger suggested in media interviews that Sandusky might have been teaching "basic hygiene skills" to some of the youths, such as how to put soap on their bodies. His office is in Carlisle.

  • Joseph McGettigan III

    Role: Lead prosecutor. Background: McGettigan, currently senior deputy attorney general, is a veteran prosecutor with stints in the Philadelphia and Delaware County district attorneys' offices and the U.S. attorney's office. McGettigan prosecuted John du Pont, the chemical fortune heir who killed an Olympic gold medal-winning wrestler at his palatial estate in 1996. He's known as an aggressive, feisty lawyer.

  • John Cleland

    Role: Judge presiding over Sandusky's trial. Background: Cleland is a semi-retired senior judge from McKean County in western Pennsylvania. Known as courteous and fair-minded, Cleland previously chaired a state panel that investigated a nationally reported scandal in Luzerne County involving the trading of juvenile-detention suspects for cash.

  • Joe Paterno

    Role: The longtime football coach was told by McQueary in 2001 that he saw Sandusky and Victim No. 2 in a shower on the Penn State campus and, in turn, told Curley and Schultz. Background: The head coach at Penn State from 1966 through 2011, and major college football's winningest, he offered to resign at the end of the 2011 season amid the uproar after Sandusky's arrest Nov. 6. The Penn State Board of Trustees, however, ousted him for what was called his "failure of leadership" surrounding allegations about Sandusky. He died of lung cancer Jan. 22.

  • Sue Paterno

    Role: Married to Paterno for almost 50 years, she raised five children with him and passionately defended her husband during the scandal and after he died. It's unclear whether she might testify.

  • Tom Corbett

    Role: Now the governor of Pennsylvania, he was attorney general when the investigation into Sandusky was launched by state prosecutors. Background: Corbett is an ex-officio member of the Penn State Board of Trustees, although he did not actively participate until after Sandusky was charged in December.

  • Linda Kelly

    Role: Pennsylvania attorney general, whose office is prosecuting Sandusky. Background: A career prosecutor in the Pittsburgh area, Kelly inherited the Sandusky probe from Corbett when she was confirmed as his temporary successor as attorney general. She leaves office in January.

  • Frank Noonan

    Role: Pennsylvania State Police commissioner. Background: Noonan garnered national attention two days after Sandusky's arrest when he criticized Paterno, a Penn State and sports icon, for failing his "moral responsibility" to do more when McQueary told him of the 2001 shower incident.

  • Jack Raykovitz

    Role: Former CEO of The Second Mile, the charity Jerry Sandusky founded. Background: Raykovitz led the charity for almost 30 years and was a longtime friend of Sandusky's. Raykovitz testified before the grand jury that recommended indicting Sandusky on child abuse charges. He resigned from The Second Mile soon after the scandal broke, and board members later complained that Raykovitz hadn't told them enough about earlier allegations against Sandusky.

*all captions via AP