Yvonne De Kort

Yvonne De Kort
Eindhoven University of Technology | TUE · Department of Industrial Engineering and Innovation Sciences

Professor

About

186
Publications
154,558
Reads
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6,380
Citations
Introduction
As environmental psychologist I focus on the physical and social context of behaviour and the contextualised nature of human technology interaction. This context frames humans’ interactions with technology and other persons and deeply influences experience. Light, a prototypical example of a contextual element that impacts mental and physical health, vitality, cognitive performance and social interaction - often outside our scope of awareness - forms the core of my current research.
Additional affiliations
January 1999 - present
Eindhoven University of Technology
Position
  • Professor (Associate)
Description
  • Environmental & Light psychology

Publications

Publications (186)
Article
Full-text available
Both nature and daylight have been found to positively influence health. These findings were, however, found in two separate research domains. This paper presents an overview of effects found for daylight and nature on health and the health-related concepts stress, mood, and executive functioning and self-regulation. Because of the overlap in effec...
Article
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Knowledge on the onset, persistence, and symmetry of effects of lighting transitions on humans is relevant when designing dynamic lighting scenarios and, additionally, can shed light on the dominance of underlying mechanisms. We examined temporal trajectories in measures of alertness, arousal and comfort after abrupt lighting transitions that were...
Article
Full-text available
Providing more diurnal light to people working indoors serves vitality and healthy entrainment of our internal clock via the non-image forming pathway. But we do not exactly know how much light people are exposed to in their office, nor do we know how much extra light they receive if we raise the overall illuminance. In this study, we tracked offic...
Article
Full-text available
To date, it is largely unknown which light settings define the optimum to steer alertness and cognitive control during regular daytime working hours. In the current article, we used a multimeasure approach combined with a relatively large sample size (N = 60) and a large range of intensity levels (20-2000 lux at eye level) to investigate the dose-d...
Article
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Light is known to elicit non–image-forming responses, such as effects on alertness. This has been reported especially during light exposure at night. Nighttime results might not be translatable to the day. This article aims to provide an overview of (1) neural mechanisms regulating alertness, (2) ways of measuring and quantifying alertness, and (3)...
Article
Full-text available
Previous research showed that office workers are mainly distracted by noise, influencing their mental health. Little investigation has been done into the influence of other workspace characteristics (i.e., temperature, amount of space, visual privacy, adjustability of furniture, wall colours, and workspace cleanliness) on distractions at the office...
Article
In this field study, we tested the effects of dynamic light scenarios and personal illuminance on visual experience, sleepiness, cognitive performance and sleep in an operational office. Two dynamic light scenarios, different in timing but with equal luminous exposure, were tested against a reference scenario in a counterbalanced crossover design....
Article
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Personal comfort systems (PCS) promise individualized thermal comfort, energy-savings and may even contribute to health by locally heating/cooling specific body segments. To date, however, insights into PCSs’ specific design guidelines or their effectiveness on whole-body thermal comfort are scarce. The fundamental question on which body segments s...
Article
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The classical textbook interpretation of thermal comfort is that it occurs when the thermoregulatory effort is minimized. However, stimulating human thermoregulatory systems may benefit health. To address this gap, we designed a novel personal comfort system (PCS) that targets only the extremities and the head. We showed the designed personal comfo...
Article
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Most people with dementia live at home supported by informal caregivers, but disturbed sleep patterns may induce a heavy burden of care. The beneficial effects of bright light on their sleep, health, and well-being have been demonstrated in clinical settings, but not in a home situation. We evaluated a dynamic lighting system in a real-life longitu...
Article
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Background: The last few decades have witnessed significant advances in the development of digital tools and applications for mental health care. Despite growing evidence for their effectiveness, acceptance and use of these tools in clinical practice remain low. Hence, a validated and easy-to-use instrument for assessing professionals’ readiness to...
Article
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Human cognitive functioning shows circadian variations throughout the day. However, individuals largely differ in their timing during the day of when they are more capable of performing specific tasks and when they prefer to sleep. These interindividual differences in preferred temporal organization of sleep and daytime activities define the chrono...
Article
Luminaires that employ both a direct and indirect lighting component have the potential to optimally benefit both the visual and non-visual aspects in lighting designs. This type of luminaire, however, still spans a huge range of possible implementations with variations in the ratio of direct/indirect light and in the distribution of the light acro...
Article
Introduction Rest-activity patterns are important aspects of healthy sleep and may be disturbed in conditions like circadian rhythm disorders, insomnia, insufficient sleep syndrome, and neurological disorders. Long-term monitoring of rest-activity patterns is typically performed with diaries or actigraphy. Here, we propose a fully unobtrusive metho...
Article
Full-text available
Detailed insights in both visual effects of light and effects beyond vision due to manipulations in illuminance and correlated color temperature (CCT) are needed to optimize study protocols as well as to design light scenarios for practical applications. This study investigated temporal dynamics and interindividual variability in subjective evaluat...
Preprint
BACKGROUND Over the last decades, significant advances have been made in the development of digital tools and applications for mental healthcare. Yet, despite growing evidence for their effectiveness, their acceptance and use in clinical practice remain low. To gain further insights in the process of eMental Health adoption and to facilitate future...
Preprint
Background: The last few decades have witnessed significant advances in the development of digital tools and applications for mental health care. Despite growing evidence for their effectiveness, acceptance and use of these tools in clinical practice remain low. Hence, a validated and easy-to-use instrument for assessing professionals' readiness t...
Article
Full-text available
Rest–activity patterns are important aspects of healthy sleep and may be disturbed in conditions like circadian rhythm disorders, insomnia, insufficient sleep syndrome, and neurological disorders. Long‐term monitoring of rest–activity patterns is typically performed with diaries or actigraphy. Here, we propose an unobtrusive method to obtain rest–a...
Article
Full-text available
Given the fact that most office workers spend substantial parts of their working day – and life – indoors, it is important to provide healthy conditions in the office. An important factor in this respect is lighting. Many laboratory studies have investigated acute effects of light on people’s alertness and cognitive performance, as well as effects...
Article
Literature has occasionally reported acute effects of office illuminance on cognitive performance during daytime. The current study was conducted to systematically investigate whether the type of task and level of task difficulty moderate the effect of daytime illuminance on cognitive functioning. Thirty healthy participants were assigned to high (...
Article
Full-text available
Preprint
Full-text available
Detailed insights in both visual effects of light and effects beyond vision due to manipulations in illuminance and correlated color temperature (CCT) are needed to optimize study protocols as well as to design light scenarios for practical applications. This study investigated temporal dynamics and interindividual variability in subjective evaluat...
Article
Full-text available
Background The COVID-19 pandemic has necessitated an immediate and large-scale uptake of online treatment for mental health care. However, there is uncertainty about what the “new normal” in mental health care will be like in post–COVID-19 times. To what extent will the experiences gained during the pandemic influence a sustainable adoption and imp...
Article
Full-text available
The use of dynamic light scenarios for indoor environments may be motivated by the aim to support our circa-dian rhythms or provide a fascinating and/or informative environment. Additionally, dynamic lighting may be beneficial as it could acutely provide support at certain times of day, or for specific tasks or activities. A systematic literature s...
Article
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The outbreak of the COVID-19 pandemic has necessitated sudden and radical changes in mental health care delivery, as strict social distancing and lockdown measures were imposed in the early phases of the pandemic. Almost overnight, practitioners were forced to transfer their face-to-face care practice to online means. In order to understand the imp...
Preprint
BACKGROUND The COVID-19 pandemic has necessitated an immediate and largescale uptake of online treatment in mental healthcare, and we are still unsure about the new normal in mental healthcare in post COVID-19 times. A relevant question we can begin to ask is to what extent the experiences gained during the pandemic will influence a sustainable ado...
Article
Full-text available
Nightshift workers go against the natural sleep–wake rhythm. Light can shift the circadian clock but can also induce acute alertness. This placebo-controlled exploratory field study examined the effectiveness of light glasses to improve alertness while reducing the sleep complaints of hospital nurses working nightshifts. In a crossover within-subje...
Article
Task illuminance is one of the most used parameters in office lighting design and is often used as a ‘single number criterion’ to verify that a lighting design meets the requirements. Although other parameters, such as wall luminance, are often highly correlated with task illuminance, not taking these explicitly into account means critical user cri...
Conference Paper
Full-text available
Social interaction technologies have increasingly become available to psychotherapeutic practice. Despite evidence for their efficacy and other unique benefits, adoption among therapists is still relatively low. A main barrier for therapists is their perception that the ability to empathize and connect with their clients is compromised in technolog...
Conference Paper
Full-text available
More than one third of a buildings' energy consumption is designated for heating and cooling. Therefore, allowing more variations in the indoor temperature provides an energy saving potential. Additionally, these variations are expected to have beneficial health effects on the building occupants. To compensate for potential discomfort amongst them...
Article
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Background: Studies suggest that light and nature should be seriously considered when building new psychiatric clinics, because of their positive effects on psychiatric recovery. AIM: To highlight positive and sustainable effects of light and greenery in mental health care. METHOD: Literature study. RESULTS: Daylight, artificial light and nature m...
Chapter
Workplace managers’ decisions on office design interventions are still dominated by cost criteria, instead of the positive effects design decisions could have on different employee outcomes (e.g., engagement, productivity, health and wellbeing) and thus on organizational effectiveness. This chapter reviews existing evidence from different academic...
Article
Full-text available
Although there are promising benefits of supportive technology in dementia care, use of these technologies is still limited. It is challenging for researchers and developers in this field to actively involve people with dementia in development. This review updates and builds on existing knowledge by including a contemporary and relevant perspective...
Book
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Since its establishment in 2009 the Intelligent Lighting Institute of Eindhoven University of Technology has been conducting research with users in living labs. This publication provides an overview of the various Living Light Labs, our achievements and the key learnings we gained over the years. These learnings cover requirements on the technical...
Article
Full-text available
Research on human functioning is notoriously difficult. This particularly holds for the study of light effects, at least if one wants to go beyond establishing that changes in light “have an effect” and understand why this effect occurs—in other words, if one wants to make causal inferences about the mechanism behind it. The latter is, of course, c...
Article
Research has explored acute effects of light level and correlated color temperature (CCT) of indoor lighting on subjective measures of alertness and task performance during daytime. Yet, these investigations did not render a conclusive or consistent finding on the relative contribution of illuminance and CCT on various cognitive domains. The curren...
Data
supplementary_materials_-_dose-response_relationships_for_effects_of_white_light_exposure – Supplemental material for Investigation of Dose-Response Relationships for Effects of White Light Exposure on Correlates of Alertness and Executive Control during Regular Daytime Working Hours
Article
Full-text available
Although context effects have repeatedly been demonstrated, it remains difficult to predict how context features influence the associative meaning of concepts. In a recent series of Experiments (see Part 1, Schietecat, Lakens, IJsselsteijn, & de Kort, 2018), we proposed and tested the dimension-specificity hypothesis for understanding and predictin...
Article
Creating the right environment is considered essential in today's office designs to foster collaboration, concentration and creativity. Much, however, is still unknown with regard to how lighting affects the office knowledge worker. In this study, we have explored the effects of a single, carefully isolated lighting design parameter, namely wall lu...
Conference Paper
Full-text available
Therapeutic rapport and empathy are essential parts of the relationship between mental health care professionals and their clients and are considered key elements of good therapeutic outcome. There are various social interaction technologies that have proven to be beneficial to current psychotherapeutic practice. Despite their proven efficacy, the...
Article
Full-text available
Although researchers have repeatedly shown that the meaning of the same concept can vary across different contexts, it has proven difficult to predict when people will assign which meaning to a concept, and which associations will be activated by a concept. Building on the affective theory of meaning (Osgood, Suci, & Tannenbaum, 1957) and the polar...
Article
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People generally prefer natural over urban environments, but little is known about what people think about when they see these environments. The aim of the present study was to investigate the associations with these scenes and their relation with preference. In a series of three studies 336 participants were asked to generate associations with pho...
Article
Full-text available
Background Stress, and specifically perseverative cognition, is considered to have considerable detrimental effects on mental and physical health. Interventions that can offer temporary stress relief could, therefore, bring considerable health benefits. Previous research has pointed to stress‐reducing effects of exposure to nature after acute stres...
Article
Chronotype questionnaires provide a simple and time-effective approach to assessing individual differences in circadian variations. Chronotype questionnaires traditionally focused on one dimension of chronotype, namely its orientation along a continuum of morningness and eveningness. The Caen Chronotype Questionnaire (CCQ) was developed to assess a...
Article
Full-text available
Background: The internet offers major opportunities in supporting mental health care, and a variety of technology-mediated mental and behavioral health services have been developed. Yet, despite growing evidence for the effectiveness of these services, their acceptance and use in clinical practice remains low. So far, the current literature still...
Article
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Aggression is strongly influenced by the surrounding socio-physical context, and the development of aggressive behavior is best understood through a continuous cycle of ongoing person-environment interactions. Empirical studies, nevertheless, have been predominantly conducted in the laboratory, studying aggression as a short-lived phenomenon, emerg...
Article
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The impression of a space depends highly on the illumination in the space, which usually is a combination of electric light and daylight. In the present study, we compared three methodologies to study the influence of electric light and daylight on the perception of the light and the perception of the atmosphere of the space. In two experiments, ra...
Article
This paper explores how everyday encounters with two natural phenomena -natural elements and daylight- influence affect and stress levels for people differing in mental health. Nature and daylight exposure both have well-documented beneficial effects on mental health and affect but to what extent their exposure has beneficial effects in daily life...
Conference Paper
Full-text available
Our moral conscience as the " inner light " that guides us shines brighter during moments of ethical conflicts, when we notice a tension between our many oughts and/or wants. We present the first analyses on speech related stress and affect in accounts of moral conflicts. For our exploratory study, we started with interviews on moral and immoral ev...
Article
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Recognizing people at risk is essential for effective prevention. We developed an instrument that conceptually links engagement in restorative activities with persons’ appreciation for mental vigor. Based on a sample of 322 persons from the general population and a clinical sample of 56 patients diagnosed with burnout, we found that the scope of a...
Conference Paper
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Mobile workers experience the social-technical gap when moral dilemmas occur on communication platforms, and technology cannot adapt to social contexts on ethical matters. On messaging applications, bots are non-human team members and/or assistants that can aid mobile workers manage ethical challenges. We present excerpts from qualitative interview...
Article
The impression of a space depends hugely on the light in the space, more specifically on the intensity, colour, beam shape and position of the light sources in that space. This relation though is very complex. The present study aims at understanding the relation between parameters of a lighting design and the resulting perceptions, focusing on the...
Article
Full-text available
This study investigated seasonal and time-of-day dependent moderations in the strength and direction of acute diurnal non-image forming (NIF) effects of illuminance level on performance, physiology, and subjective well-being. Even though there are indications for temporal variations in NIF-responsiveness to bright light, scientific insights into po...
Article
Research in the late evening and at night has shown that acute activating effects of light are particularly sensitive to short-wavelength light. Yet, findings on such effects during daytime are still inconclusive. This study (N = 39) investigated effects of correlated colour temperature (CCT; 2700 K vs. 6000 K, 500 lx on the desk) on individuals' e...
Article
Full-text available
This study investigated diurnal non-image forming (NIF) effects of illuminance level on physiological arousal in parallel to NIF effects on vigilance and working memory performance. We employed a counterbalanced within-subjects design in which thirty-nine participants (mean age = 21.2; SD = 2.1; 11 male) completed three 90-min sessions (165 vs. 600...
Article
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More and more people use self-tracking technologies to track their psychological states, physiology, and behaviors to gain a better understanding of themselves or to achieve a certain goal. Ecological Momentary Assessment (EMA) also offers an excellent opportunity for restorative environments research, which examines how our physical environment (e...
Article
With the increase of building automation in the work environment, there is a risk that occupants lose their sense of control when decisions on environmental aspects such as temperature, electric lighting, and daylight are made by technology. This paper reports two experiments in which we investigated the effect of the level automation and the type...
Research
Full-text available
The ties between our social context, our spatial, physical and technological environment and human experience are many and this web of relationships does not easily lend itself to a comprehensive discussion, nor to all-inclusive investigation. In this inaugural lecture I make a case for a contextual perspective in human-technology interaction by il...