Psychology (from Greek: ψυχή psykhē "breath, spirit, soul"; and -λογία , "-logia" "study of") is an academic and applied discipline involving the scientific study of human mental functions and behavior.
 Occasionally, in addition or opposition to employing the scientific method, it also relies on symbolic interpretation and critical analysis, although these traditions have tended to be less pronounced than in other social sciences, such as sociology.
 Psychologists study phenomena such as perception, cognition, emotion, personality, behavior, and interpersonal relationships.
 Some, especially depth psychologists, also study the unconscious mind.
The Vicious Brothers are Canadian-American filmmakers Colin Minihan and Stuart Ortiz.
 They are best known for writing and directing the cult horror film, "Grave Encounters" and for writing and producing its sequel, "Grave Encounters 2".
 They also wrote and produced "Extraterrestrial", which Minihan solo directed.
Grave Encounters 2 is a 2012 Canadian-American horror film, directed by John Poliquin, written by The Vicious Brothers and the sequel to the 2011 film "Grave Encounters".
 It is shot in found footage style like its predecessor and follows a group of devoted fans who break into the same psychiatric hospital to investigate whether the events of the previous film actually happened, quickly becoming the targets of the hospital's malevolent entities.
 The film was released on iTunes on October 2, 2012 and received a limited theatrical release on October 12, 2012.
 "Grave Encounters 2" became a commercial success, but was a critical failure.
Grave Encounters is a 2011 Canadian supernatural horror film, shot found footage style.
 The footage follows the crew of a paranormal reality television program who lock themselves in a haunted psychiatric hospital in search of evidence of paranormal activity as they shoot what ends up becoming their final episode.
The Psychologists League was an organization of left-wing psychologists, including Karen Machover and Dan Harris, that tried to protect the interests of unemployed psychologists during the Great Depression of the 1930s.
 Initially formed by clinicians at Bellevue Hospital, it soon attracted a wide membership, organizing public discussions and taking part in the May Day Parade.
 As a Marxist group with Communist sympathies, it tried not just to create more employment opportunities for psychologists, but also to work towards the establishment of non-capitalist institutions that would assure the proper social utilization of psychologists.
 Yet although the Psychologists League did manage to create some job opportunities for psychologists, especially through the Works Progress Administration, in its more ambitious goals it proved to be less successful.
 In fact its influence on the policies of the American Psychological Association was largely negligible.
 After the Molotov-Ribbentrop Pact of 1939, the organization split between Socialists and Communists and soon disbanded.
The Federal Neuro Psychiatric Hospital, also known as Yaba Psychiatric Hospital or Yaba Left is a Nigerian Federal psychiatric hospital in Yaba, a suburb of Lagos.
Sean Rogerson (born September 30, 1977) is a Canadian actor and former photomodel, known for his role as Lance Preston in the horror films, "Grave Encounters" and "Grave Encounters 2".
Royal Park Psychiatric Hospital, commonly known as Royal Park is a former Receiving House and Psychiatric Hospital located in Parkville.
 Operating for over 90 years, Royal Park Hospital was the first psychiatric hospital established in Victoria after the Lunacy Act of 1903, and was intended for patients with curable disorders.
 Built on the north-western edge of the 181 hectare parklands known as Royal Park, Royal Park Hospital along with Royal Melbourne Hospital, Royal Children's Hospital and Mount Royal formed the Parkville Hospital Precinct.
 Following the hospital's closure in the 1990s, several of the hospital's original buildings have been listed on the Victorian Heritage Register for their historic and architectural values.
A haunted house or ghosthouse is a house or other building often perceived as being inhabited by disembodied spirits of the deceased who may have been former residents or were familiar with the property.
 Parapsychologists attribute haunting to the spirits of the dead and the effect of violent or tragic events in the building's past such as murder, accidental death, or suicide.
 More scientific explanations for the perception that a house is haunted include misinterpreting noises naturally present in structures, waking dreams, suggestibility, and the effect of toxic substances in environments that can cause hallucinations.
Greystone Park Psychiatric Hospital (also known as Greystone Psychiatric Park, Greystone Psychiatric Hospital, or simply Greystone and formerly known as the State Asylum for the Insane at Morristown, New Jersey State Hospital, Morris Plains, and Morris Plains State Hospital) referred to both the former psychiatric hospital and the historic building that it occupied in Morris Plains, New Jersey.
 Built in 1876, the facility was built to alleviate overcrowding at the state's only other "lunatic asylum" located in Trenton, New Jersey.
 Originally built to accommodate 350 people, the facility, having been expanded several times, reached a high of over 7700 patients resulting in unprecedented overcrowding conditions.
 In 2008, the facility was ordered to be closed as a result of deteriorating conditions and overcrowding.
 A new facility was built on the large Greystone campus nearby and bears the same name as the aging facility.
 Despite considerable public opposition and media attention, demolition of the main Kirkbride building began in April 2014 and was completed by October 2015.

Question: What kind of psychologists study houses with the same defining quality as the psychiatric hospital in the film Grave Encounters?
Answer: Parapsychologists