Peter Theuns

Peter Theuns
Vrije Universiteit Brussel | VUB · Experimental and Applied Psychology (EXTO)

PhD

About

63
Publications
12,522
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,036
Citations
Introduction
Peter Theuns is involved in research on the meaning of the concept of Quality of Life in different populations. Special interest goes to "measuring subjective wellbeing". Both experimental an survey research methods are employed for this. Peter Theuns is a member of the End-Of-Life care Research Group (EOLC, Chaired by Luc Deliens).

Publications

Publications (63)
Article
Full-text available
Introduction: In case of untreatable suffering at the end of life, continuous sedation until death (CSD) may be the only treatment option left. Because these patients cannot communicate anymore, caregivers have to rely on behavioral observation to assess the patient's comfort. Recently, however, a number of studies from the neurosciences have show...
Article
Full-text available
Background No treatment demonstrated to improve survival in patients with recurrent glioblastoma (rGB) in a randomized trial. Combining axitinib with the programmed cell death ligand 1 blocking monoclonal antibody avelumab may result in synergistic activity against rGB. Methods Adult patients with rGB following prior surgery, radiation therapy and...
Article
Full-text available
Purpose. To assess neurocognitive function (NCF), psychosocial outcome, health-related quality of life (HRQoL), and long-term effects of immune-related adverse events (irAE) on metastatic melanoma survivors treated with ipilimumab (IPI). Methods. Melanoma survivors were identified within two study populations (), at a single-center university hospi...
Article
Full-text available
Purpose The aim of this study was to assess the evolution of health-related quality of Life (HRQoL), emotional burden, and neurocognitive function in the first-generation metastatic melanoma survivors treated with pembrolizumab. Methods Survivors were defined as patients who achieved a durable remission for at least 6 months after initiating pembr...
Article
Context: Assessing consciousness and pain during continuous sedation until death (CSD) by behavior-based observational scales alone has recently been put into question. Instead, the use of monitoring technology has been suggested to make more objective and reliable assessments. Insights into which factors influence attitudes towards using these mo...
Article
2034 Background: Patients (pts) with recurrent glioblastoma (rGB) have a poor prognosis, and no treatment option demonstrated to improve survival in a randomized trial. Axitinib (AXI), an oral VEGFR 1-3 inhibitor has demonstrated single agent activity in rGB and reduces the need for corticosteroids (CS). Avelumab (AVE) is a fully human anti-PD-L1 I...
Article
97 Background: Immunotherapy with the CTLA-4 blocking mAb ipilimumab (IPI) has improved the long-term (>3 y) survival of a subpopulation (15-20%) of patients (pts) with metastatic melanoma. Little is known about the psychosocial outcome and the long-term effects of immune-related adverse events in these survivors. Methods: Pts with advanced melanom...
Article
Background: Awareness and pain during palliative sedation is typically assessed by observational scales, but the use of such scales has been put into question. Case presentation: A woman in her mid-80s was admitted to a palliative care unit, presenting with chronic lymphatic leukemia, depression, and a cerebrovascular accident, with right-sided...
Article
Full-text available
Background: In case of untreatable suffering at the end of life, palliative sedation may be chosen to assure comfort by reducing the patient's level of consciousness. An important question here is whether such sedated patients are completely free of pain. Because these patients cannot communicate anymore, caregivers have to rely on observation to...
Poster
Full-text available
A concise presentation of a transdisciplinary mixed method study protocol to assess comfort during palliative sedation.
Article
162 Background: An increasing proportion of advanced melanoma patients (pts), treated with immune checkpoint inhibitors and/or BRAF/MEK-inhibitors, achieve long-term survival. The traumatic experience of melanoma progression, which often involves the brain, puts them at high risk for emotional and neurocognitive function (NCF) disturbances that may...
Article
Recurrent glioblastoma is a devastating disease for which no treatment has demonstrated to improve overall survival in a randomized clinical trial. Anti-tumor Cytolytic T-cell (CTL) activity is suppressed by the CTLA4 and PD-1 immune-checkpoint receptors. Nivolumab(NIVO) is an IgG-4 mAb that blocks PD-1, and ipilimumab(IPI) an IgG-1 mAb that blocks...
Article
Full-text available
Previous research has found that participants in redecision marathons experience increased personal growth and improvements in psychological well-being (McNeel, 1982; Noriega-Gayol, 1997; Widdowson & Rosseau, 2014). In this article, the authors conducted a quantitative analysis based on the use of the Ryff Scales of Psychological Wellbeing to deter...
Article
Purpose: This international study aims to examine the size and determinants of the impact of stroke on five-year survivors' health-related quality of life (HRQoL) in four different European countries. Method: Patients were recruited consecutively in four European rehabilitation centers. Five years after stroke, the EuroQol-visual analog scale (E...
Poster
Full-text available
The aim of this study is to better understand what palliative sedated patients experience in the last days of their life and to find out if they are really free of pain. In this study we want to observe 40 patients from the moment that palliative sedation has been initiated until death. We will evaluate to what degree assessments of comfort based o...
Article
Full-text available
Despite the fact that studies on self-determination theory have traditionally disregarded the explicit role of emotions in the motivation eliciting process, research attention for the affective antecedents of motivation is growing. We add to this emerging research field by testing the moderating role of emotion differentiation -individual differenc...
Article
In the present study, we study the effect of four specific emotions (i.e. happiness, relaxation, depression, and anxiety) on autonomous and controlled motivated behaviour. Drawing on the componential approach to emotions, we argue that because different emotions have a different action readiness—the readiness to engage with the environment—they als...
Article
Full-text available
We studied the mediating role of enjoyment in the relationship between task characteristics and work effort. To this end, an experience sampling study was implemented in which 50 employees reported on the characteristics of the task they were performing, their level of enjoyment, and their level of work effort five times a day for five working days...
Article
Full-text available
This study evaluates how patterns of psychosocial referral of patients with elevated distress differ in a 'systematic screening for distress' condition versus a 'usual practice' condition in ambulatory oncology practice. The psychosocial referral process in a 2-week usual practice (N = 278) condition was compared with a 2-week 'using the Distress B...
Article
Full-text available
Curiosity is a personality trait that is inversely related to depression and positively related to subjective wellbeing. However, the relationship between curiosity and these two outcomes is still unclear which hampers our general understanding of well-being. Based on research within positive psychology that showed character strengths such as curio...
Article
Full-text available
In 2002 physician-assisted dying was legally regulated in the Netherlands and Belgium. Besides fundamental and ethical objections to physician-assisted dying, one of the frequently expressed pragmatic concerns is that legal regulation of physician-assisted dying, as implemented in the Netherlands and Belgium, could stunt the development of palliati...
Article
The relationship between need satisfaction and motivation is well established within self-determination theory (SDT). However, less is known about the affective mechanism that underlies this relationship. In this study, we extend SDT by focusing on the exact role of affect in the need satisfaction–motivation relationship. To this end, we conducted...
Article
Full-text available
Bernheim’s ACSA, a less conventional measure of subjective well-being originally developed for use in a clinical setting, was applied to a sample of black South African township dwellers (n = 1,020) in the Eastern Cape Province. The Anamnestic Comparative Self Assessment is an experiential self-anchoring scale with concrete anchors (Bernheim in Psy...
Article
Full-text available
The use of quality of life (QOL) outcomes in clinical trials is increasing as a number of practical, ethical, methodological, and regulatory reasons for their use have become apparent. It is important, then, that QOL measurements and differences between QOL scores be readily interpretable. We study interpretation in two contexts: when determining Q...
Article
Full-text available
In cross-cultural research on quality of life, researchers must deal with the fundamental incomparability of subjective wellbeing assessments across cultural groups. This incompatibility most probably results from an identification problem: cultural groups most likely differ in both objective achievements in different life domains as well as in the...
Article
Full-text available
Sleep-wake behavior, as well as sleepiness, is regulated by the joint action of an exponentially increasing drive for sleep -sleep homeostasis-and by variations in sleep propensity due to a biological circadian oscillator. However, large inter-individual differences remain. Short and long sleepers have been known to differ in the amount of homeosta...
Article
Self-anchoring scales were first mentioned by Kilpatrick and Cantril (J Indiv Psychol 16:158–170, 1960) and Cantril (The pattern of human concerns, 1965) as rating instruments in which the end anchors are defined by the respondent himself, basing on his own assumptions, perceptions, goals and values. The uses of these scales are legion and they hav...
Article
Full-text available
In this research the impact of two types of end anchors on the linearity of the category rating scale is studied. Two functional measurement experiments were carried out, each requiring a different kind of judgement, i.e., job satisfaction ratings and attractiveness ratings. One group of participants rated the stimuli using a category rating scale...
Article
Full-text available
To evaluate whether the WHOQOL-BREF measures the QOL construct in the same way across nations. Students from Flanders, Belgium and Iran completed the WHOQOL-BREF as part of a larger Quality of Life questionnaire. Their responses were compared using a multi-group confirmatory factor analysis. In general, the QOL construct appears rather similar in b...
Article
Full-text available
The present studies were conducted to contribute to the debate on the interaction between circadian (C) and homeostatic (S) processes in models of sleep regulation. The Two-Process Model of Sleep Regulation assumes a linear relationship between processes S and C. However, recent elaborations of the model, based on data from forced desynchrony studi...
Article
Full-text available
Personal relations constitute an important life domain and satisfaction therein affects happiness in people. In an experimental approach with a 3×3×3 vignettes study in which 103 first year psychology students participated, the contribution of the quality of relationships with parents, friends, and a partner are studied. It is found that the studie...
Article
Full-text available
Information Integration Theory (IIT) is concerned with how people combine information into an overall judgment. A method is hereby presented to perform Functional Measurement (FM) experiments, the methodological counterpart of IIT, on the Web. In a comparison of Web-based FM experiments, face-to-face experiments, and computer-based experiments in t...
Article
Full-text available
In this study a psychometric comparison is made between a category rating scale with fixed anchors and a self-anchoring category rating scale where respondents themselves define the end anchors by referring to their personal experiences with the construct being measured. A student-satisfaction questionnaire was administered to 301 undergraduate stu...
Article
Full-text available
Screening instruments may enhance the clinician's ability to detect elevated levels of distress in cancer patients, but these are often neither suitable nor effective for the routine of daily care for cancer patients. The newly developed Distress Barometer (DB) was intended to provide medical doctors with a convenient tool to interpret 'at single g...
Article
The current study evaluates three hypothesized models on subjective well-being, comprising life domain ratings (LDR), overall satisfaction with life (OSWL), and overall dissatisfaction with life (ODWL), using structural equation modeling (SEM). A sample of 1,310 volunteering students, randomly assigned to six conditions, rated their overall life (d...
Article
A sample of 1,737 volunteering students, randomly assigned to 12 conditions, rated their current overall (dis)satisfaction with life. Each condition used 1 of 12 response formats, differing in (1) polarity (bipolar versus unipolar), (2) orientation (horizontal versus vertical), and (3) anchoring (-5 to +5, Not Numbered, and 0 to 10). Results: For s...
Article
Full-text available
Unintentional sleep and performance impairment due to extended wakefulness are often the cause of traffic and work accidents. Therefore, large-scale screening instruments assessing the ability to resist falling asleep during monotonous tasks are needed. The current widespread computer use in industrial and home settings offers the possibility to us...
Article
Full-text available
The Anamnestic Comparative Self Assessment (ACSA) measure of subjective well-being (SWB) aims to reduce the problems of cultural bias and relativity to external standards by allowing people to define the endpoints or ‘anchors’ of the measurement scale. In medical terminology anamnestic denotes ‘based on memory’. The ACSA uses subjects’ memories of...
Article
Full-text available
We propose a free, easy-to-use computer program that does not requires prior knowledge of computer programming to generate and run experiments using textual or pictorial stimuli. Although the FM Experiment Builder suite was initially programmed for building and conducting FM experiments, it can also be applied for non-FM experiments that necessitat...
Article
Full-text available
The objective of this study is to examine whether manipulating the orientation of a rating scale impacts on the perceived intensity of the verbal qualifiers. An experiment is designed to assess the perception of intensities of verbal qualifiers in an agreement scale. A first finding is that participants seem to adopt one of two response strategies....
Article
Two functional measurement studies were conducted to test the effect of two types of end anchors on the linearity of Visual Analogue Scale (VAS) data. With the first type of end anchors, participants responded to the stimuli using a VAS with predefined end anchors. With the second type, respondents defined the end anchors in terms of their own assu...
Article
Full-text available
In this research, the relationship between the number of response categories and the linearity and sensitivity of self-anchoring scales is tested. According to the functional measurement paradigm, people integrate their impressions of stimuli using simple algebraic models. Then the integrated stimulus is transformed into an overt response on a rati...
Article
Full-text available
How can one test linearity of a given response measure? This question has received attention with the increased study of algebraic models. The advantage of studying algebraic models is that they permit simultaneous analysis of the algebraic model and of the responses generated by the model (Anderson, 1981, 1982, 1992, 1996; Birnbaum & Veit, 1974; W...
Article
Trough the “cross modality matching” approach this research examines the perceived intensity of verbal qualifiers used in agreement scales. Also, the effect on perceived intensity resulting from the scaling context in itself (i.e. number of response categories and the chosen verbal qualifiers) is investigated. Results show a low amount of inter-ind...
Article
Full-text available
Background: The conventional question (CQ) on subjective well-being (SWB) is e.g. “How is life?”, with ratings between e.g. ‘Best’ and ‘Worst possible’. Disadvantages may be casualness of responses and biases of proximate, peer or cultural relativity. Alternatively, with Anamnestic Comparative Self-Assessment (ACSA), the scale anchors are the respo...
Article
A 22030-4444, USA Gregory L. Murphy Beckman Institute, University of Illinois, 405 North Mathews Avenue, Urbana, IL 61801, USA Fionn D. Murtagh European Space Agency/Space Telescope, European Coordinating Facility, Karl. Schwarzschild-Strasse 2, D-8046 Garching bei Mnchen, Germany Contents Preface 1. General introduction: purpose, underlying ideas,...
Chapter
Boolean analysis is a partial order generalization of scalogram analysis. It enables one to build a family of implication schemes that bears a 1-1-relationship with a data set. Unlike scalogram analysis, this method does not impose any constraints on the data structure. As a result, implication schemes may become extremely complex and may contain e...
Book
Full-text available
Chapter 1, Models of Concepts, coauthored with Daniele Dubois
Chapter
In Boolean analysi’s of questionnaires, a main problem is the fact that the complexity of the implication graphs depends on the length of the PCU’s (the terms in the minimal expression characterizing the ignored response patterns). A possible solution is the dichotomization of the consulted population, such that a (small) part of the population is...
Article
Full-text available
Subjective well-being consists of a subjective evaluation and integration of happiness about specific life domains to the extent that one thinks well of and feels good about these domains. Three functional measurement experiments investigated how information on life domains is integrated into a global rating of well-being. There is good evidence th...
Article
Full-text available
Frisbie and Brandenburg (1979) and Dunham and Davison (1991) ob- served that many researchers spend a lot of time constructing questionnaire items that ensure maximal content and face validity while they overlook the fact that the labeling of the rating scale could cause invalid responses. The central issue of the present study is whether labels sh...
Article
Full-text available
Self-anchoring scales were first mentioned by Kilpatrick and Cantril (1960) and Cantril (1965) as rating instruments in which the end anchors are defined by the respondent himself, basing on his own assumptions, perceptions, goals and values. The uses or these scales are legion and they have proven to be very useful in reducing measurement bias in...
Article
A 22030-4444, USAGregory L. Murphy Beckman Institute, University of Illinois, 405 NorthMathews Avenue, Urbana, IL 61801, USAFionn D. Murtagh European Space Agency/Space Telescope, EuropeanCoordinating Facility, Karl. Schwarzschild-Strasse 2, D-8046 Garching beiMnchen, GermanyContentsPreface1. General introduction: purpose, underlying ideas, and sco...
Article
Questions on happiness and well-being have preoccupied human thought from time immemorial. The emancipation of the theme from the sphere of morality and religion and its entry in science however is rather recent. This evolution is illustrated by the exponential expansion of QOL-studies and the growing interest of public institutions for their findi...

Network

Cited By

Projects

Project (1)