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Biomedical subjects

G B Leong

Publications and source records attributed to G B Leong.

At least 19 recordsLinked to original sources
PubMed1995

Delusional misidentification of health care professionals.

Delusional misidentification of others generally involves a person misidentifying others who are emotionally and geographically proximate to that person. Health care professionals may become the objects of delusional misidentification. The present study reviews and analyzes the anglophonic literature on published reports of misidentified health care professionals and adds two new cases. Relevant issues raised when patients misidentify health care professionals are explored, particularly the danger posed by these misidentification delusions.

Adult↗
PubMed1995

Visual-perceptual abnormalities in delusional misidentification.

Delusional misidentification syndromes are often found in conjunction with visual-perceptual abnormalities. These abnormalities appear to be independent of visual hallucinations and are illusory in nature. A case of delusional misidentification with visual-perceptual abnormalities is presented. Cognitive and visual phenomenology suggests that careful recording of visual abnormalities may shed light on the relation between delusional misidentification and abnormal visual cognition.

Adult↗
PubMed1995

Dangerous delusions of misidentification of the self.

Delusions of misidentification of the self involve radical misidentification of physical and/or psychological aspects of the self. These delusions have received limited attention from a phenomenological as well as from a forensic psychiatric perspective. In this article we present a series of four cases of dangerous delusional misidentification of the self and discuss important factors that may contribute to their dangerousness.

Adult↗
PubMed1995

Another courtroom assault on the confidentiality of the psychotherapist-patient relationship.

The therapeutic and legal protections afforded by California's psychotherapist-patient privilege have become increasingly eroded in such recent cases as People v. Wharton and Menendez v. Superior Court. In another capital case, People v. Webb, the California Supreme Court further erodes this privilege in regard to the private (confidential) treatment records of a prosecution witness. The Webb case and its possible implications are explored.

Adult↗
PubMed1995

Psychiatric factors associated with dangerous misidentification delusions.

The delusional misidentification syndromes are characterized by misidentification delusions of others or of the self. Aggressive ideas or behaviors often accompany these delusions. The relationship between delusional misidentification and dangerousness remains for the most part poorly understood. In the present article, we compare a group of dangerous individuals suffering from dangerous misidentification delusions with a group of dangerous individuals suffering from other types of delusions. Individuals with dangerous misidentification delusions were more likely to experience grandiose ideation, thought disorder, generalized hostility, excitement, general psychopathology, and a previous history of violence than dangerous delusional individuals with no delusional misidentification. The group with dangerous delusional misidentification syndromes was less likely to attack others with weapons than were the dangerous delusional group with no delusional misidentification.

Adult↗
PubMed1994

Delusional misidentification syndromes and dangerousness.

Dangerousness in the delusional misidentification syndromes is studied by reviewing a sample of 82 cases defined by either verbal threats or physical violence caused by misidentification delusion. Eighty cases were obtained from a review of the anglophone psychiatric literature in which the patients exhibited some degree of dangerousness, to which we added 2 previously unreported cases.

Adult↗
PubMed1994

Delusions of psychological change of the self.

Delusions of psychological change of the self are becoming increasingly appreciated as a type of misidentification delusions. Most available knowledge on delusions of psychological change of the self derives from single case studies. In this article, we present a study encompassing 30 cases of this delusion. Diagnostic and phenomenologic aspects of this delusion are discussed as well as its relation to other types of misidentification delusions.

Adult↗
PubMed1994

The dangerousness of persons with the Othello syndrome.

The Othello syndrome, or delusional jealousy, often raises significant forensic issues, particularly dangerousness. Dangerous patients suffering from the Othello delusion may present with hostility ranging from verbal threats to homicidal acts. We present three cases of individuals suffering from Othello syndrome associated with significant hostility and organic mental factors. We analyze these cases along with Othello syndrome cases culled from the recent anglophonic literature, especially in terms of implications for domestic and public safety.

Adult↗
PubMed1994

A cognitive model of dangerous delusional misidentification syndromes.

The hallmark of the delusional misidentification syndromes is the presence of a misidentification delusion of the self or others. Delusional misidentification may present with an increased risk for dangerous behaviors. Individuals suffering from delusional misidentification syndromes may express hostility in ways ranging from serious verbal threats to homicidal acts. The causes of dangerous misidentification delusions remain for the most part undetermined. In this article, we report a series of six cases of individuals who harbored dangerous misidentification delusions. These individuals were studied phenomenologically and forensically. They were also studied biologically, including neuropsychological testing. A cognitive hypothesis aimed at explaining dangerousness and delusional misidentification is proposed. Implications of the hypothesis for further research are briefly outlined.

Adult↗
PubMed1992

The Capgras syndrome in paranoid schizophrenia.

Capgras syndrome is characterized by a delusion of impostors who are thought to be physically similar but psychologically distinct from the misidentified person. This syndrome is generally thought to be relatively rare. Most of our knowledge about Capgras syndrome derives from single case studies and small series of cases usually from diagnostically heterogeneous groups. In this article, a series of 31 patients suffering from both paranoid schizophrenia and Capgras syndrome is described. Issues pertaining to the phenomenology of Capgras syndrome, the possible relation between Capgras syndrome and other delusional misidentification syndromes, and a neurobiological hypothesis aimed at explaining Capgras syndrome are discussed.

Adult↗
PubMed1992

The psychotherapist as witness for the prosecution: the criminalization of Tarasoff.

The "duty to protect" doctrine heralded by the Tarasoff decision seeks to prevent physical harm to third parties by psychiatric patients. Recent court cases have mandated the testimony of a criminal defendant's psychotherapist both about the Tarasoff warning itself and about confidential treatment information that was associated with the warning. One court further ruled that some clinical sessions were not psychotherapy and therefore were not afforded the protection of psychotherapist-patient privilege. The continuing erosion of confidentiality has resulted in psychiatrists and other mental health professionals becoming prosecution witnesses at the criminal trials of their own patients.

California↗