Jos De Keijser
Biographic Data
| ID | 4030153 |
|---|---|
| NAME | Jos De Keijser |
| GIVEN NAMES | Jos |
| FAMILY NAME | De Keijser |
| SIGNATURE | DE KEIJSER J |
| AFFILIATIONS | University of Groningen |
| ORCID | 0000-0003-1229-3042 |
| VERIFIED | Yes |
| TOTAL WORKS | 14 |
| TOTAL CITATIONS | 24 |
| WORKS AS AUTHOR | 14 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2003 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 2 |
An explainable machine learning approach to predict prolonged grief severity using the MARBLES archive
Prolonged grief disorder (PGD), characterised by persistent and disabling grief, is officially recognised as a mental disorder. Accurate prediction of prolonged grief (PG) symptomatology is vital to intervention efforts. We trained machine learning models to predict PG severity using cross-sectional data from the MARBLES archive ( N = 5570). With explainable AI (XAI), we examined linear and nonlinear relationships, individual differences, and int…
Initial Validation of a Measure Assessing DSM-5-TR and ICD-11 Prolonged Grief in Children and Adolescents
Valid and reliable instruments to assess the most recent prolonged grief disorder (PGD) criteria, as defined in the DSM-5-TR and ICD-11, are lacking. This study aimed to provide an initial validation of the Traumatic Grief Inventory—Kids—Clinician-Administered (TGI-K-CA) for assessing Prolonged Grief Disorder (PGD) symptoms in bereaved children and adolescents according to DSM-5-TR and ICD-11 criteria. Ninety bereaved Dutch children (aged 8–18 ye…
Revenge and forgiveness after victimization
The Transgression Related Interpersonal Motivations (TRIM) scale measures revenge, avoidance, and benevolence in response to social transgressions that, typically, comprise acts of indirect aggression. We tailored the TRIM for use in forensic psychiatric and victimological settings by slightly altering the instruction to include transgressions that comprise direct as well as indirect aggression. In this study, we examined the factor structure and…
The mediating role of state anger in the associations between intentions to participate in the criminal trial and psychopathology in traumatically bereaved people
Victims of crimes have been granted increasing procedural rights to participate in the juridical process since the mid 1990s. However, knowledge about the (anti)-therapeutic effect of participation is limited. We examined the associations between symptom levels of persistent complex bereavement disorder (PCBD), posttraumatic stress disorder (PTSD), and depression and the intention to participate in a criminal trial. Furthermore, we investigated t…
Associations of dimensions of anger with distress following traumatic bereavement
Pending replication of our findings in longitudinal studies, we conclude that anger subtypes relate differently to distress after traumatic loss. Anger toward the self seems the most detrimental type of anger and may therefore be an important target in treatment. (PsycInfo Database Record (c) 2024 APA, all rights reserved)
Only One Way Out”-Partners' Experiences and Grief Related to the Death of Their Loved One by Suicide or Physician-Assisted Dying Due to a Mental Disorder
Expectedness of the death of the partner, absence of suffering of the partner at the time of dying, and presence of physician support may in part explain the protective effects of PAD against severe grief reactions. Physicians considering their position regarding their personal involvement in PAD due to a mental disorder could take grief reactions of the bereaved partner into account
Toward a Better Understanding of Psychological Symptoms in People Confronted With the Disappearance of a Loved One
Further validation of the Traumatic Grief Inventory-Self Report (TGI-SR)
The Traumatic Grief Inventory Self-Report version (TGI-SR) is an 18-item self-report measure. It was designed to assess symptoms of Persistent Complex Bereavement Disorder (PCBD) included in Diagnostic and Statistical Manual of Mental Disorders (DSM)-5 and Prolonged Grief Disorder (PGD) proposed by an international group of experts in grief. The research in this article used data from a bereaved patient sample and people who lost loved ones in th…
I’ve changed, but I’m not less happy
Twenty-three nonclinical relatives of long-term missing persons were interviewed. Patterns of functioning over time were studied retrospectively by instructing participants to draw a graph that best described their pattern. Patterns most frequently drawn were a recovery and resilient/stable pattern. Participants were also asked to select 5 out of 15 cards referring to coping strategies, which they considered most helpful in dealing with the disap…
Psychopathology Among Homicidally Bereaved Individuals
In the literature on bereavement, claims are made that homicidal loss is associated with posttraumatic stress reactions, depression, and other severe mental health problems. It is surprising that only a few studies have investigated the nature and prevalence of emotional symptoms following homicidal bereavement and a reference to systematic, empirical research is seldom provided. This article reviews the available literature to investigate whethe…
Cognitive–behavioral variables mediate the impact of violent loss on post-loss psychopathology
Research has shown that violent losses lead to more severe emotional distress than do nonviolent losses. Little is known about the psychological mechanisms underlying the debilitating impact of violent loss. In the current study, the authors used self-reported data of 496 bereaved individuals, bereaved in the last 3 years, to examine the role of seven cognitive-behavioral variables in mediating the impact of violent loss: (a) a sense of "unrealne…
Revenge and psychological adjustment after homicidal loss
Feelings of revenge are a common human response to being hurt by others. Among crime victims of severe sexual or physical violence, significant correlations have been reported between revenge and Posttraumatic Stress Disorder (PTSD). Homicide is one of the most severe forms of interpersonal violence. It is therefore likely that individuals bereaved by homicide experience high levels of revenge, which may hamper efforts to cope with traumatic loss…
Treatment of complicated grief
Few studies have examined treatments for complicated grief--a debilitating condition that can develop after the loss of a loved one. This study compared the effectiveness of cognitive-behavioral therapy with a nonspecific treatment with supportive counseling (SC). Using a minimization method, 54 mourners with clinically significant levels of complicated grief were allocated to 1 of 3 treatment conditions: (a) a condition of 6 sessions of cognitiv…
Reliability and Validity of the Dutch Version of the Inventory of Traumatic Grief (Itg)
The psychometric properties of the Dutch version of the Inventory of Traumatic Grief (ITG) were investigated in two studies with bereaved adults who had suffered the loss of a first-degree relative. In Study 1, exploratory factor analysis indicated that the items of the ITG clustered together into one underlying factor. In addition, the internal consistency of the ITG and its short-term temporal stability were found to be high. In Study 2 it was …
Reliability and Validity of the Dutch Version of the Inventory of Traumatic Grief (Itg)
The psychometric properties of the Dutch version of the Inventory of Traumatic Grief (ITG) were investigated in two studies with bereaved adults who had suffered the loss of a first-degree relative. In Study 1, exploratory factor analysis indicated that the items of the ITG clustered together into one underlying factor. In addition, the internal consistency of the ITG and its short-term temporal stability were found to be high. In Study 2 it was …
Further validation of the Traumatic Grief Inventory-Self Report (TGI-SR)
The Traumatic Grief Inventory Self-Report version (TGI-SR) is an 18-item self-report measure. It was designed to assess symptoms of Persistent Complex Bereavement Disorder (PCBD) included in Diagnostic and Statistical Manual of Mental Disorders (DSM)-5 and Prolonged Grief Disorder (PGD) proposed by an international group of experts in grief. The research in this article used data from a bereaved patient sample and people who lost loved ones in th…
I’ve changed, but I’m not less happy
Twenty-three nonclinical relatives of long-term missing persons were interviewed. Patterns of functioning over time were studied retrospectively by instructing participants to draw a graph that best described their pattern. Patterns most frequently drawn were a recovery and resilient/stable pattern. Participants were also asked to select 5 out of 15 cards referring to coping strategies, which they considered most helpful in dealing with the disap…
Reliability and Validity of the Dutch Version of the Inventory of Traumatic Grief (Itg)
The psychometric properties of the Dutch version of the Inventory of Traumatic Grief (ITG) were investigated in two studies with bereaved adults who had suffered the loss of a first-degree relative. In Study 1, exploratory factor analysis indicated that the items of the ITG clustered together into one underlying factor. In addition, the internal consistency of the ITG and its short-term temporal stability were found to be high. In Study 2 it was …
Treatment of complicated grief
Few studies have examined treatments for complicated grief--a debilitating condition that can develop after the loss of a loved one. This study compared the effectiveness of cognitive-behavioral therapy with a nonspecific treatment with supportive counseling (SC). Using a minimization method, 54 mourners with clinically significant levels of complicated grief were allocated to 1 of 3 treatment conditions: (a) a condition of 6 sessions of cognitiv…
Cognitive–behavioral variables mediate the impact of violent loss on post-loss psychopathology
Research has shown that violent losses lead to more severe emotional distress than do nonviolent losses. Little is known about the psychological mechanisms underlying the debilitating impact of violent loss. In the current study, the authors used self-reported data of 496 bereaved individuals, bereaved in the last 3 years, to examine the role of seven cognitive-behavioral variables in mediating the impact of violent loss: (a) a sense of "unrealne…
Revenge and psychological adjustment after homicidal loss
Feelings of revenge are a common human response to being hurt by others. Among crime victims of severe sexual or physical violence, significant correlations have been reported between revenge and Posttraumatic Stress Disorder (PTSD). Homicide is one of the most severe forms of interpersonal violence. It is therefore likely that individuals bereaved by homicide experience high levels of revenge, which may hamper efforts to cope with traumatic loss…
Psychopathology Among Homicidally Bereaved Individuals
In the literature on bereavement, claims are made that homicidal loss is associated with posttraumatic stress reactions, depression, and other severe mental health problems. It is surprising that only a few studies have investigated the nature and prevalence of emotional symptoms following homicidal bereavement and a reference to systematic, empirical research is seldom provided. This article reviews the available literature to investigate whethe…
I’ve changed, but I’m not less happy
Twenty-three nonclinical relatives of long-term missing persons were interviewed. Patterns of functioning over time were studied retrospectively by instructing participants to draw a graph that best described their pattern. Patterns most frequently drawn were a recovery and resilient/stable pattern. Participants were also asked to select 5 out of 15 cards referring to coping strategies, which they considered most helpful in dealing with the disap…
Further validation of the Traumatic Grief Inventory-Self Report (TGI-SR)
The Traumatic Grief Inventory Self-Report version (TGI-SR) is an 18-item self-report measure. It was designed to assess symptoms of Persistent Complex Bereavement Disorder (PCBD) included in Diagnostic and Statistical Manual of Mental Disorders (DSM)-5 and Prolonged Grief Disorder (PGD) proposed by an international group of experts in grief. The research in this article used data from a bereaved patient sample and people who lost loved ones in th…
Toward a Better Understanding of Psychological Symptoms in People Confronted With the Disappearance of a Loved One
Revenge and forgiveness after victimization
The Transgression Related Interpersonal Motivations (TRIM) scale measures revenge, avoidance, and benevolence in response to social transgressions that, typically, comprise acts of indirect aggression. We tailored the TRIM for use in forensic psychiatric and victimological settings by slightly altering the instruction to include transgressions that comprise direct as well as indirect aggression. In this study, we examined the factor structure and…
The mediating role of state anger in the associations between intentions to participate in the criminal trial and psychopathology in traumatically bereaved people
Victims of crimes have been granted increasing procedural rights to participate in the juridical process since the mid 1990s. However, knowledge about the (anti)-therapeutic effect of participation is limited. We examined the associations between symptom levels of persistent complex bereavement disorder (PCBD), posttraumatic stress disorder (PTSD), and depression and the intention to participate in a criminal trial. Furthermore, we investigated t…
Associations of dimensions of anger with distress following traumatic bereavement
Pending replication of our findings in longitudinal studies, we conclude that anger subtypes relate differently to distress after traumatic loss. Anger toward the self seems the most detrimental type of anger and may therefore be an important target in treatment. (PsycInfo Database Record (c) 2024 APA, all rights reserved)
Only One Way Out”-Partners' Experiences and Grief Related to the Death of Their Loved One by Suicide or Physician-Assisted Dying Due to a Mental Disorder
Expectedness of the death of the partner, absence of suffering of the partner at the time of dying, and presence of physician support may in part explain the protective effects of PAD against severe grief reactions. Physicians considering their position regarding their personal involvement in PAD due to a mental disorder could take grief reactions of the bereaved partner into account
An explainable machine learning approach to predict prolonged grief severity using the MARBLES archive
Prolonged grief disorder (PGD), characterised by persistent and disabling grief, is officially recognised as a mental disorder. Accurate prediction of prolonged grief (PG) symptomatology is vital to intervention efforts. We trained machine learning models to predict PG severity using cross-sectional data from the MARBLES archive ( N = 5570). With explainable AI (XAI), we examined linear and nonlinear relationships, individual differences, and int…
Initial Validation of a Measure Assessing DSM-5-TR and ICD-11 Prolonged Grief in Children and Adolescents
Valid and reliable instruments to assess the most recent prolonged grief disorder (PGD) criteria, as defined in the DSM-5-TR and ICD-11, are lacking. This study aimed to provide an initial validation of the Traumatic Grief Inventory—Kids—Clinician-Administered (TGI-K-CA) for assessing Prolonged Grief Disorder (PGD) symptoms in bereaved children and adolescents according to DSM-5-TR and ICD-11 criteria. Ninety bereaved Dutch children (aged 8–18 ye…
Grief, Bereavement, and Mental Health (12 works) · Clinical Psychology (11 works) · Psychology (11 works) · Grief (9 works) · Complicated grief (8 works) · Psychiatry (8 works) · Clinical Psychology (7 works) · Medicine (7 works) · Migration, Health and Trauma (6 works) · Poison control (5 works)