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| 2. |
- Ahlström, Christer, 1977-, et al.
(författare)
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The impact of driver sleepiness on fixation-related brain potentials
- 2020
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Ingår i: Journal of Sleep Research. - : Wiley. - 0962-1105 .- 1365-2869. ; 29:5
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Tidskriftsartikel (refereegranskat)abstract
- The effects of driver sleepiness are often quantified as deteriorated driving performance, increased blink durations and high levels of subjective sleepiness. Driver sleepiness has also been associated with increasing levels of electroencephalogram (EEG) power, especially in the alpha range. The present exploratory study investigated a new measure of driver sleepiness, the EEG fixation-related lambda response. Thirty young male drivers (23.6 +/- 1.7 years old) participated in a driving simulator experiment in which they drove on rural and suburban roads in simulated daylight versus darkness during both the daytime (full sleep) and night-time (sleep deprived). The results show lower lambda responses during night driving and with longer time on task, indicating that sleep deprivation and time on task cause a general decrement in cortical responsiveness to incoming visual stimuli. Levels of subjective sleepiness and line crossings were higher under the same conditions. Furthermore, results of a linear mixed-effects model showed that low lambda responses are associated with high subjective sleepiness and more line crossings. We suggest that the fixation-related lambda response can be used to investigate driving impairment induced by sleep deprivation while driving and that, after further refinement, it may be useful as an objective measure of driver sleepiness.
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| 3. |
- Ljung Aust, Mikael, 1973
(författare)
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Developing Theoretical and Empirical Definitions of Safety Problems in Driving Suitable for Active Safety Function Evaluation
- 2009
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In passive safety, the requirement specifications used for evaluation of protective functions are both standardised and specified at a high level of detail regarding evaluation scenario definition, performance metrics and pass/fail criteria. For active safety, while several propositions for evaluation scenarios have been made, neither these, nor performance metrics and pass/fail criteria have yet reached a similar level of detail and standardisation. The objective of this thesis is to address two underlying reasons for this difference. One is theoretical in nature. On a general level, a set of principles and concepts which capture the fundamental ideas of a field of science can be called a conceptual framework. For active safety function evaluation, such a framework is currently lacking. To address this issue, a conceptual framework called Situational control was developed. The framework integrates fundamental ideas relevant for active safety function evaluation into a holistic and practically applicable picture. Its applicability was demonstrated by applying it in the context of writing and implementing requirement specifications for active safety function evaluation.The second reason is of empirical character. To evaluate the extent to which active safety functions prevent and/or mitigate crashes, it is essential to characterize the sequence of events which leads to collisions in a way which includes information on causal factors. To do this, data from official databases (macroscopic data), and in-depth case studies is often used. Macroscopic data is usually statistically representative but has limited information on why crashes happen, while the opposite is true of case studies. Using the two in combination would therefore seem ideal. However, the principles for connecting them are far from clear and current approaches suffer inherent weaknesses. To address this issue, a generalization methodology which links information in case studies to macroscopic crash types, in a way which covers not only context but also causation similarity, was developed. The feasibility of the methodology was tested through application on three sets of intersection crash data. Results indicate that the methodology was sufficiently successful to warrant further exploration with larger data sets.
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| 4. |
- Svensson, Idor, 1957-, et al.
(författare)
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Effects of assistive technology for students with reading and writing disabilities
- 2021
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Ingår i: Disability and Rehabilitation. - : Taylor & Francis Group. - 1748-3107 .- 1748-3115. ; 16:2, s. 196-208
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Tidskriftsartikel (refereegranskat)abstract
- Background: Assistive technology has been used to mitigate reading disabilities for almost three decades, and tablets with text-to-speech and speech-to-text apps have been introduced in recent years to scaffold reading and writing. Few scientifically rigorous studies, however, have investigated the benefits of this technology.Purpose: The aim was to explore the effects of assistive technology for students with severe reading disabilities.Method: This study included 149 participants. The intervention group received 24 sessions of assistive technology training, and the control group received treatment as usual.Results: Both the intervention and control groups improved as much in 1 year as the normed population did. However, gains did not differ between the groups directly after the intervention or at 1 year of follow-up.Conclusions: The use of assistive technology seems to have transfer effects on reading ability and to be supportive, especially for students with the most severe difficulties. In addition, it increases motivation for overall schoolwork. Our experience also highlights the obstacles involved in measuring the ability to assimilate and communicate text.
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| 5. |
- Nilsson, Mats E., et al.
(författare)
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Perceptual validation of auralized road traffic noise
- 2011
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Ingår i: Proceedings of Inter-Noise 2011. - Osaka, Japan : The Institute of Noise Control Engineering of Japan and the Acoustical Society of Japan. ; 4, s. 3453-3460
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Auralization of road-traffic noise may be a useful tool for city planning, for instance as a support to decisions regarding noise mitigation. However, to be useful, the auralizations need to be perceptually valid. That is, the auralized sounds should be perceptually indistinguishable from real sounds or, at least, similar with respect to perceptual factors crucial for correct decisions. For this reason, the auralization methodology developed in the Swedish LISTEN-project was perceptually evaluated. In four listening experiments, listeners assessed recordings and auralizations of the same car passages. Although real and auralized sounds were not completely indistinguishable, perfect discrimination was not possible. Moreover, good agreements between auralized and real sounds were found for perceived similarity, perceived annoyance and perceived speed. The results illustrate the usefulness of psychoacoustic methods and multivariate statistics for perceptual evaluation of auralizations and provide support for the validity of the LISTEN-approach to auralization.
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| 6. |
- Peplow, A., et al.
(författare)
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Exterior Auralization of Traffic Noise within the LISTEN project
- 2011
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Ingår i: Proceedings - 6th Forum Acusticum 2011, Aalborg, 27 June - 1 July 2011. - : European Acoustical Association. - 2221-3767. ; , s. 665-669
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In the present paper, computational auralizations of a single pass-by of a passenger car and passenger train are investigated. Auralization of future traffic noise scenarios would be a valuable tool for city planners, noise consultants and decision makers, since it would make it possible to evaluate various noise mitigation solutions already at the planning stage. The main goal of the Swedish multidisciplinary research project LISTEN has been to develop such a tool. This paper reports recent listening experiments conducted to perceptually evaluate the auralizations and subsequent improvements on computational methodologies regarding road and rail traffic noise and passenger train source models.
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| 7. |
- Hägerhäll, Caroline, et al.
(författare)
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Human physiological benefits of viewing nature: EEG responses to exact and statistical fractal patterns.
- 2015
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Ingår i: Nonlinear Dynamics, Psychology, and Life Sciences. - 1090-0578. ; 19:1, s. 1-12
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Tidskriftsartikel (refereegranskat)abstract
- Psychological and physiological benefits of viewing nature have been extensively studied for some time. More recently it has been suggested that some of these positive effects can be explained by nature's fractal properties. Virtually all studies on human responses to fractals have used stimuli that represent the specific form of fractal geometry found in nature, i.e. statistical fractals, as opposed to fractal patterns which repeat exactly at different scales. This raises the question of whether human responses like preference and relaxation are being driven by fractal geometry in general or by the specific form of fractal geometry found in nature. In this study we consider both types of fractals (statistical and exact) and morph one type into the other. Based on the Koch curve, nine visual stimuli were produced in which curves of three different fractal dimensions evolve gradually from an exact to a statistical fractal. The patterns were shown for one minute each to thirty-five subjects while qEEG was continuously recorded. The results showed that the responses to statistical and exact fractals differ, and that the natural form of the fractal is important for inducing alpha responses, an indicator of a wakefully relaxed state and internalized attention.
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| 8. |
- Asutay, Erkin, 1982, et al.
(författare)
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Emotional Bias in Change Deafness in Multisource Auditory Environments
- 2014
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Ingår i: Journal of experimental psychology. General. - : American Psychological Association. - 0096-3445 .- 1939-2222. ; 143:1, s. 27-32
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Tidskriftsartikel (refereegranskat)abstract
- Theories of auditory attention suggest that humans decompose complex auditory input into individual auditory objects, which then compete for attention to dominate auditory perception. Since emotional significance of external stimuli has been argued to provide cues for sensory prioritization and allocation of attention, emotionally salient auditory objects can receive attention to dominate auditory perception. On the basis of the function of audition as an alarm system that informs the organism about its immediate surroundings, and on empirical evidence that emotion can modulate auditory perception, we argue that auditory stimuli with greater emotional saliency would dominate perception in multisource environments. To test our hypothesis, we employed a change detection task in which participants were asked to indicate whether multisource auditory scenes were identical or different. Participants were better at detecting changes at the presence of an emotionally negative environment compared to neutral environment. Further, we found that participants were better at detecting changes of emotionally negative targets compared to neutral targets. Our results demonstrate that detecting changes in auditory scenes is influenced by emotion. The findings are discussed in the light of the theories of auditory attention, emotional modulation of attention, and the adaptive function of emotion for perception.
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| 9. |
- Karlsson, Bodil, 1974, et al.
(författare)
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Light my fire but don't choke on the smoke: Wellbeing and pollution from fireplace use in Sweden
- 2020
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Ingår i: Energy Research and Social Science. - : Elsevier BV. - 2214-6296 .- 2214-6326. ; 69
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Tidskriftsartikel (refereegranskat)abstract
- Fireplaces are popular in Northern Europe. However, particle emissions from fireplaces have been identified as an environmental problem and a health problem. User behaviors affect particle emissions and the success of particle reducing technologies to a large extent. This interdisciplinary study aims to investigate why and how people use their fireplaces, including what emotions people associate with fire, and their interest in learning more about fire making and changing behavior related to fire making. It does so by applying an emotion regulation model in a novel way. In total, 146 Swedish individuals owning a fireplace (the majority had wood stoves, a few had tiled stoves, boilers or other types of fireplaces) participated in an online questionnaire about motives, behaviors, knowledge, and interest in learning and changing behavior. The most common motives for using a fireplace in this sample were complementary heating and “cozy fire making”. Our results suggest that watching a fire can aid in regulating emotions from unpleasant stress towards joy and provide a pleasant atmosphere for socialization, and that wood fuel may be a preferred complementary energy choice because it provides beautiful light, comfortable warmth, beautiful design and safety. People reporting emotional motives for using a fireplace also reported an interest in changing behavior. © 2020
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| 10. |
- Roos, John Magnus, et al.
(författare)
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The five factor model of personality as predictor of online shopping : Analyzing data from a large representative sample of Swedish internet users
- 2022
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Ingår i: Cogent Psychology. - : Taylor & Francis Group. - 2331-1908. ; 9:1
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Tidskriftsartikel (refereegranskat)abstract
- Using a large representative sample of the Swedish population, the present study aimed to explore the relationship between the Five Factor Model (FFM) of personality and frequency of online shopping. On three different occasions, surveys were sent out to 9,000 Swedish residents using a systematic random sampling procedure. In total, 5,238 individuals responded to the survey which, inter alia, included measures of the FFM of personality (i.e., HP5i, 15 items) and online shopping. A confirmatory factor analysis confirmed the construct validity of the HP5i. To examine whether and to what extent the FFM predicted self-reported frequency of online shopping, a hierarchical regression analysis was conducted in which gender and age were used as control variables. Our findings indicated that online shopping was positively associated with Openness to experience (i.e., openness to feelings) and Extraversion (i.e., hedonic capacity), and negatively associated with Conscientiousness (i.e., a high degree of impulsiveness). These results suggest that online shoppers are affective, hedonic, and impulsive; that is, characteristics that contrast with the classical view of online shoppers as cognitive, utilitarian, and goal-directed. We argue that these results, alongside the use of a large representative sample and frequency of online purchase, are a needed addition to previous research as previous research studies mainly have focused on the intention or motivation to online shopping using smaller non-representative samples. Implications for online retailers and society as well as directions for future research are discussed.
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