Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
See detailPerception et confort acoustiques des Systèmes de Traitement d'Air
Minard, Antoine ULg

Doctoral thesis (2013)

This thesis addresses the perceived acoustic comfort of Air-Treatment Systems (ATS), such as air-conditioners installed in offices, by taking into account the environmental factors related to the specific ... [more ▼]

This thesis addresses the perceived acoustic comfort of Air-Treatment Systems (ATS), such as air-conditioners installed in offices, by taking into account the environmental factors related to the specific context of ATS usage. The only existing standard to evaluate the sounds emitted by ATS, which is the emitted sound level in dBA, is only loosely related to perception. Therefore, the need of manufacturers for a more reliable standard arises. This implies a thorough study of the perception of the sound of ATS as it is emitted. A precise methodology was then followed: it includes first collecting a high number of ATS sound recordings, up to finally developing a robust metrics to predict the perceived sound quality. For that purpose, different perceptual categories were first identified to constitute the recording database of ATS sounds. A corpus considered as fully representative of the different types of emitted sounds was then extracted from the recording database. Current principles of musical timbre description have already proved to be adequate to other types of environmental sounds; by applying these principles, the relevant auditive attributes for the corpus perceptual description were identified. In order to develop an efficient sound quality predictor through audio features calculation, prominent features based on these auditive attributes were identified that explain the listeners' preferences among ATS sounds. The ecological context of ATS was examined in a second step. Two environmental factors were addressed in the context of ATS sound quality evaluation to ponder their importance in the listeners' perception. As the ATS under study are exclusively indoor systems designed for offices, the effect of reverberation on sound quality evaluation was first studied; for that purpose, an auralization tool was used to simulate room acoustic response. The influence of listeners' attention context on perceived sound quality was then evaluated through a comparative study of various listening conditions. As a matter of fact, the sound emitted by ATS in real conditions is perceived as a perturbation of current activities. It is therefore relevant to evaluate how deeply the degree of attention related to the sound affects listeners as regards their perception of acoustic quality. Eventually, the relevance of the proposed sound quality predictor to comfort perception was assessed in conditions more ecologically representative than usual laboratory environment. [less ▲]

Detailed reference viewed: 35 (4 ULg)
See detailLa perception et connaissance d'autrui
Leyens, J.; Dardenne, Benoît ULg

in Richelle, Marc (Ed.) Traité de psychologie expérimentale. Vol. 2 (1994)

Detailed reference viewed: 18 (2 ULg)
See detailPerception et langage chez Brentano
Boccaccini, Federico ULg

Scientific conference (2011, February 15)

Detailed reference viewed: 8 (0 ULg)
Full Text
See detailPerception et représentations de l'espace architectural
Van de Vreken, Anne ULg

Master's dissertation (2008)

Tout projet d'architecture est le résultat de l'interaction entre la perception, l'imagination et la représentation d'un espace. La perception recompose les images de l'environnement extérieur que l'on ... [more ▼]

Tout projet d'architecture est le résultat de l'interaction entre la perception, l'imagination et la représentation d'un espace. La perception recompose les images de l'environnement extérieur que l'on perçoit par nos sens : elle explore le monde. L'imagination façonne les images d'une réalité intérieure, qu'il s'agisse de souvenirs d'expériences passées ou des projections d'un futur imaginé. La représentation de l'espace, au sens large, consiste d'abord en la sélection, l'organisation et la présentation d'informations destinées à un public particulier. Bien entendu, l'information donnée doit demeurer exacte et sa présentation ne doit pas la déformer, c'est la responsabilité même du concepteur qui est engagée sur ce point. Ce dernier devient un convertisseur d'idées en représentations qu'un public donné pourra facilement comprendre. Ce travail de fin d'étude se partage en deux parties : La première partie consiste en un état de l'art, faisant essentiellement appel aux théories de l'architecture et de la psychologie. La seconde partie s'attache à répondre à la question : quelle est la meilleure représentation d'un espace pour un non architecte ? Pour y répondre, une expérience visant à comparer l'efficacité et l'impact de trois types de représentations classiquement utilisés en architecture (à savoir le plan, la maquette en carton et la visite virtuelle d'un modèle 3D) pour la perception des ambiances a été mise en oeuvre : elle consiste à comparer les jugements de novices en architecture sur 32 critères d'ambiance basés sur l'utilisation de ces trois types de représentations (T1) aux jugements effectués par les mêmes participants sur les mêmes critères dans l'espace réel (T2). Pour chacun des critères, deux types d'analyses ont été effectuées : (1) les différences entre les représentations en T1 et (2) les différences entre les facteurs d'ambiance perçus sur base de la représentation (T1) et de la visite réelle (T2). Enfin, cette deuxième partie conclut, à partir des résultats issus de ces analyses, sur des recommandations pour des systèmes visant à faire percevoir la qualité des ambiances du bâtiment. [less ▲]

Detailed reference viewed: 1087 (14 ULg)
Full Text
Peer Reviewed
See detailPerception gaps between patients with ulcerative colitis and healthcare professionals: an online survey.
Schreiber, Stefan; Panes, Julian; LOUIS, Edouard ULg et al

in BMC Gastroenterology (2012), 12(1), 108

ABSTRACT: BACKGROUND: The purpose of this study was to examine the differing perspectives and perceptual gaps relating to ulcerative colitis (UC) symptoms and their management between patients and ... [more ▼]

ABSTRACT: BACKGROUND: The purpose of this study was to examine the differing perspectives and perceptual gaps relating to ulcerative colitis (UC) symptoms and their management between patients and healthcare professionals (HCPs). METHODS: Structured, cross-sectional, Web-based questionnaires designed to assess a variety of disease indices were completed by adult patients with UC and HCPs involved in the care of patients with UC from Canada, France, Germany, Ireland, Spain, and the United Kingdom. RESULTS: Surveys were completed by 775 patients, 475 physicians, and 50 nurses. Patient self-reported classification of disease severity revealed generally greater severity (mild, 32 %; moderate, 53 %) compared with physician and nurse estimates of UC severity among their caseloads (mild, 52 % and 49 %; moderate, 34 % and 37 %, respectively). Patients reported that an average of 5.5 (standard deviation, 11.0) flares (self-defined) occurred over the past year, compared with 3.4 and 3.8 flares per year estimated by physicians and nurses. Perceived flare triggers differed between patients (stress ranked first) and HCPs (natural disease course ranked first). Fifty-five percent of patients stated that UC symptoms over the past year had affected their quality of life, while physicians and nurses estimated that 35 % to 37 % of patients would have a reduced quality of life over the same period. Patients ranked urgency and pain as the most bothersome symptoms, while physicians and nurses ranked urgency and stool frequency highest. About half of patients (47 %) defined remission as experiencing no symptoms; by comparison, 62 % to 63 % of HCPs defined remission as requiring the complete absence of symptoms. HCPs (doctors/nurses in general practice and/or hospital) were regarded by patients as their main source of UC information by 72 %; however, 59 % reported not arranging regular visits to see their HCPs. CONCLUSIONS: This large survey identified important differences between patients' and HCPs' perceptions of the impact of UC symptoms on patients' lives. Notably, HCPs may underestimate the effect of specific UC symptoms on patients and may fail to recognize issues that are important to patients. [less ▲]

Detailed reference viewed: 8 (0 ULg)
See detailPerception interne, intuition, Evidenzphilosophie. Brentano et la métaphysique cartésienne
Boccaccini, Federico ULg

in Metaphysik und Psychologie bei Brentano (in press)

Detailed reference viewed: 43 (6 ULg)
Peer Reviewed
See detailPerception of aphid infested tomato plant volatiles by the predator Episyrphus balteatus
Verheggen, François ULg; Arnaud, Ludovic; Capella, Quentin et al

Poster (2006)

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailPerception of aphid infested tomato plant volatiles by the predator Episyrphus balteatus
Verheggen, François ULg; Arnaud, Ludovic; Capella, Quentin et al

in Communications in Agricultural and Applied Biological Sciences (2005)

In a tritrophic interaction including tomato plant (Lycopersicon esculentum Miller), the herbivore Myzus persicae (Sulzer) and the predator Episyrphus balteatus (De Geer), the perception of the tomato ... [more ▼]

In a tritrophic interaction including tomato plant (Lycopersicon esculentum Miller), the herbivore Myzus persicae (Sulzer) and the predator Episyrphus balteatus (De Geer), the perception of the tomato plants produced volatile organic compounds (VOC) by Episyrphus balteatus is investigated. In a first step, an odour sampling device has been set up aiming the headspace collection of the tomato plant VOC and their adsorption on Tenax adsorbent cartridges (Supelco®). Following desorption is held using a thermodesorption injector (Gerstel®) coupled with GC-MS. Intact and aphid infested plants are studied for their VOC emissions, as well as the comparison of the VOC emission of different tomato cultivars. These VOC consist mainly in mono- and sesquiterpenes (such as - and -pinene ; -humulene ; …) as well as in C6-volatiles like hexenal in case of infestation by herbivores Once the tomato plants VOC identified and quantified, they are tested for their perception by Episyrphus balteatus using electroantennography (EAG). Accordingly, an EAG device has been installed and configured for the study of VOC using Diptera antennas. The monoterpenes limonene and linalool showed high EAG activity whereas other terpenes like cymene seem to be inactive. [less ▲]

Detailed reference viewed: 76 (9 ULg)
Full Text
Peer Reviewed
See detailPerception of climate change and adaptation strategies in the drylands of West Africa : A review
De Longueville, Florence ULg; Ozer, Pierre ULg; Vigil, Sara ULg

Poster (2014, May 15)

The perception of climate change has become an exiting new field of research explored in recent years. This is a response from the international scientific community to the conclusions of the 4th report ... [more ▼]

The perception of climate change has become an exiting new field of research explored in recent years. This is a response from the international scientific community to the conclusions of the 4th report of the Intergovernmental Panel on Climate Change which had underlined serious deficiencies in this field, particularly in West Africa where population is largely dependent of rain-fed agriculture. Yet, a global survey of the literature since 2000 shows that most references on this topic were published over the last five years. [...] [less ▲]

Detailed reference viewed: 19 (1 ULg)
Full Text
Peer Reviewed
See detailPerception of dyspnea in mild smoking asthmatics
Kleis, S.; Chanez, P.; Delvaux, Muriel ULg et al

in Respiratory Medicine (2007), 101(7), 1426-1430

Background: Previous data from the literature reported blunted perception of airway obstruction in severe asthmatics with near fatal asthma. Approximately 25% of patients with asthma are current smokers ... [more ▼]

Background: Previous data from the literature reported blunted perception of airway obstruction in severe asthmatics with near fatal asthma. Approximately 25% of patients with asthma are current smokers. Aim: To determine whether there is an alteration in perception of airway obstruction during a non specific provocative challenge with methacholine in mild controlled asthmatics who smoke. Methods: Enrolled in this study were 50 subjects, including 26 mild asthmatics and 24 healthy subjects, all of them current smokers. The first objective was the sensitivity of airway obstruction calculated by the regression slope linking the change in the visual analogic scale (VAS) assessed by the patient and the fall in FEV1 during a methacholine challenge. Results: Asthmatics who smoke had a blunted perception of airway obstruction during the bronchial challenge significantly different from that seen in healthy smokers (p = 0.03). This impaired dyspnea perception was inversely related to baseline VAS (r = -0.29, p<0.05) and positively related to baseline FEV1 (r = 0.35, p<0.05). Perception of airway obstruction was not correlated with age, sex, atopy or with airway inflammation features such as exhaled NO or sputum eosinophils. Conclusion: Mild asthmatics who smoke display reduced dyspnea perception during a nonspecific provocative challenge with methacholine. This altered perception of airway obstruction does not relate to airway inflammation. (C) 2007 Elsevier Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 27 (8 ULg)
Full Text
See detailPerception of emotion in impaired facial and vocal expression
Verduyckt, Ingrid; Morsomme, Dominique ULg

in Izdebski, Krzysztof (Ed.) Emotions in the Human Voice Volume II: Clinical Evidence (2008)

This chapter tries to give a short overview of the main currents in contemporary theories of emotional expression. First, we attempt to draw a brief outline of how emotions are defined as compared to ... [more ▼]

This chapter tries to give a short overview of the main currents in contemporary theories of emotional expression. First, we attempt to draw a brief outline of how emotions are defined as compared to other affective states. Second, we try to give a short picture of the different views concerning the relationship between emotional expressions and experienced emotions, as well as the role of those expressions in human interactions. Third, the vocal and facial modes of emotion expressions are detailed. Fourth, we focus on how emotional expressions can be affected by different diseases, such as Parkinson’s disease, Steinert’s disease, and Moebius syndrome, at the vocal and the facial level. The impact of these impairments is considered in the light of the conclusions about the function of emotional expressions in society today. We conclude with a reflection about the therapy possibilities in reeducation of impaired emotional expressions. [less ▲]

Detailed reference viewed: 80 (17 ULg)
See detailPerception of Environmental Health by Children in Cities
Gosset, Christiane ULg

in Case studies and sub-plenary presentations, International Healthy and Ecological Cities Congress (1995)

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailPerception of head and neck cancer quality of life within the medical world: a multicultural study.
Demez, Pierre ULg; Moreau, Pierre ULg

in Head & Neck (2009), 31(8), 1056-67

BACKGROUND: Physician's perception of quality of life of patients with cancer is unclear. No reports have evaluated its influence on patient management. METHODS: Five hundred otolaryngologists completed a ... [more ▼]

BACKGROUND: Physician's perception of quality of life of patients with cancer is unclear. No reports have evaluated its influence on patient management. METHODS: Five hundred otolaryngologists completed a questionnaire regarding the quality of life of patients with head and neck cancer. RESULTS: Seventy-eight percent of responders thought that quality of life must be considered when choosing treatment, even if this meant decreased survival. Seventy-five percent thought it justified to withhold curative treatment if this would lead to impaired quality of life. Pain and breathing were the most important symptoms to consider. The perception was worse for physicians practicing in Latin culture, working in private practice, or with no personal acquaintance with a head and neck cancer victim and was better after radiotherapy than after surgery and chemotherapy. CONCLUSION: Quality of life is important for physicians and is considered as essential as survival by many physicians. The perception of patient's quality of life influences the treatment choice. [less ▲]

Detailed reference viewed: 31 (5 ULg)
Full Text
See detailPerception of melodic accuracy in occasional singers: role of pitch fluctuations?
Larrouy, Pauline ULg; Pfordresher, Peter Q

Conference (2014, April 26)

When listening to operatic singers performances, our perception of vocal pitch accuracy is influenced by several acoustical parameters such as the fluctuation of the fundamental frequency (i.e vibrato ... [more ▼]

When listening to operatic singers performances, our perception of vocal pitch accuracy is influenced by several acoustical parameters such as the fluctuation of the fundamental frequency (i.e vibrato). In the case of occasional singers, produced pitch is likewise not constant, but the fluctuations in such cases tend not to involve vibrato but to instead involve “scoops” at the beginning and ends of tone, as well as other forms of instability. However, little is known about the fluctuations that characterize occasional singers (including poor-pitch singers) and to what degree these fluctuations influence perception of pitch accuracy. We report results of ongoing research designed to address these issues. First, we describe a descriptive model used to identify perturbations of F0 in occasional singers that differ between accurate and poor-pitch singers. Next, we report results of recent experiments that explore the influence of the pitch fluctuations described by the model on the perception of pitch accuracy. [less ▲]

Detailed reference viewed: 15 (0 ULg)
Full Text
Peer Reviewed
See detailPerception of pain in the minimally conscious state with PET activation: an observational study.
Boly, Mélanie ULg; Faymonville, Marie-Elisabeth ULg; Schnakers, Caroline et al

in Lancet Neurology (2008), 7(11), 1013-20

BACKGROUND: Patients in a minimally conscious state (MCS) show restricted self or environment awareness but are unable to communicate consistently and reliably. Therefore, better understanding of cerebral ... [more ▼]

BACKGROUND: Patients in a minimally conscious state (MCS) show restricted self or environment awareness but are unable to communicate consistently and reliably. Therefore, better understanding of cerebral noxious processing in these patients is of clinical, therapeutic, and ethical relevance. METHODS: We studied brain activation induced by bilateral electrical stimulation of the median nerve in five patients in MCS (aged 18-74 years) compared with 15 controls (19-64 years) and 15 patients (19-75 years) in a persistent vegetative state (PVS) with (15)O-radiolabelled water PET. By way of psychophysiological interaction analysis, we also investigated the functional connectivity of the primary somatosensory cortex (S1) in patients and controls. Patients in MCS were scanned 57 (SD 33) days after admission, and patients in PVS 36 (9) days after admission. Stimulation intensities were 8.6 (SD 6.7) mA in patients in MCS, 7.4 (5.9) mA in controls, and 14.2 (8.7) mA in patients in PVS. Significant results were thresholded at p values of less than 0.05 and corrected for multiple comparisons. FINDINGS: In patients in MCS and in controls, noxious stimulation activated the thalamus, S1, and the secondary somatosensory or insular, frontoparietal, and anterior cingulate cortices (known as the pain matrix). No area was less activated in the patients in MCS than in the controls. All areas of the cortical pain matrix showed greater activation in patients in MCS than in those in PVS. Finally, in contrast with patients in PVS, those in MCS had preserved functional connectivity between S1 and a widespread cortical network that includes the frontoparietal associative cortices. INTERPRETATION: Cerebral correlates of pain processing are found in a similar network in controls and patients in MCS but are much more widespread than in patients in PVS. These findings might be objective evidence of a potential pain perception capacity in patients in MCS, which supports the idea that these patients need analgesic treatment. [less ▲]

Detailed reference viewed: 282 (20 ULg)
Full Text
Peer Reviewed
See detailPerception of the Duration of time: a Developmental Semiology from 2:6 to 12 years, general population versus atypical, and elaboration of a parental questionnaire assessment
SCHOLL, Jean-Marc ULg; Delvenne, Véronique

Poster (2013, July)

Introduction The perception of time is usually considered from sequential time but there are not any semiological markers of the capacity to apprehend the duration of time. Hypothesis The “capacity to ... [more ▼]

Introduction The perception of time is usually considered from sequential time but there are not any semiological markers of the capacity to apprehend the duration of time. Hypothesis The “capacity to feel the passage of time” is determinable by “semiological markers” in everyday life. Method Elaboration of a parental questionnaire (Likert scale); 2 samples from 2:6 to 12 years: 827 in general population and 297 in transnosographic population with psychological therapy; logistic regression; percentiles curves. Results General population: perception of the passage of time is gradually acquired; full competence at 9 years. The apprehension of sequential time is quasi maximum at 4 years. Atypical population: perception of the passage of time delayed of 18 months; important difficulties remain at 13 years. The apprehension of sequential time is delayed; at 13 years it remains bad at percentile 95. No differences according to the sex. Presentation of a short questionnaire for assessment. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Peer Reviewed
See detailPerception of vocal and facial cues of four primary emotions tsadness, hapiness, anger, fear) in a patient affectied by Steinert disease and in a professional actor. Matching of vocal and visual signals
Morsomme, Dominique ULg; Verduyckt, Ingrid

Conference (2005, March 12)

Aims: This single-case study assess the emotional expression in a patient affected with Steinert disease in order to better analyze the patient's therapeutical needs as well as widen our perspective on ... [more ▼]

Aims: This single-case study assess the emotional expression in a patient affected with Steinert disease in order to better analyze the patient's therapeutical needs as well as widen our perspective on the therapeutical means in speech therapy. Methods: A neutral text was read by the patient and a comedian, with five different emotions (joy, anger, fear, sadness and neutral). A group of judges identified the emotions by categorical choice and graded their intensity on a 4-point scale. The samples included three modes: visual, audio and audio-visual. Results: Compared to the comedian, the patient’s expression of emotion is less well perceived in the visual mode (65%>51%, (p=0.009)). In the gradation of intensity, there is a better correlation for the comedian (0.583>0.325, p<0.001) than for the patient. Conclusion: The results suggests that the emotions expressed by the patient are less well identified, especially through the visual channel, which confirms the influence of the patient’s disease on the quality of his emotional expressions. In addition, the fact that the patient's expressions are less well transmitted through the facial channel leads the author to consider a therapy focused not only on vocal capacities but also on facial mimicry. [less ▲]

Detailed reference viewed: 17 (0 ULg)
Full Text
Peer Reviewed
See detailPerception par les élèves de la place réservée par leur école secondaire à la promotion d’un style de vie actif.
Maraite, Anne-Aymone ULg; Schmit, John; Cloes, Marc ULg

in Amans-Passaga, Christine; Gal-Petitfaux, Nathalie; Terral, Philippe (Eds.) et al L'intervention en sport et ses contextes institutionnels: cultures et singularité de l'action (2010, May)

Actuellement, les bénéfices d'une activité physique quotidienne sont largement reconnus et des études de plus en plus nombreuses mettent en évidence les divers bénéfices qu'apporte la pratique régulière d ... [more ▼]

Actuellement, les bénéfices d'une activité physique quotidienne sont largement reconnus et des études de plus en plus nombreuses mettent en évidence les divers bénéfices qu'apporte la pratique régulière d'exercices hysiques. ... [less ▲]

Detailed reference viewed: 55 (7 ULg)
Full Text
See detailPerception sensorielle et comportement chez la truite arc-en-ciel
Faucher, Karine ULg; Millot, Sandie ULg; Lefrançois, Christel et al

in Jalabert, Bernard; Fostier, Alexis (Eds.) La truite arc-en-ciel: De la biologie à l’élevage (2010)

Detailed reference viewed: 81 (24 ULg)
Full Text
See detailLa perception sociale des risques: étude de cas sur les champs électromagnétiques en Belgique
Brunet, Sébastien ULg; Delvenne, Pierre ULg; Fallon, Catherine ULg

Conference (2008, November 14)

Dans le cadre de cette étude, nous avons voulu mesurer la perception sociale du risque relatif à l’exposition aux champs électromagnétiques. Notre objectif était d’identifier les modes de connaissances ... [more ▼]

Dans le cadre de cette étude, nous avons voulu mesurer la perception sociale du risque relatif à l’exposition aux champs électromagnétiques. Notre objectif était d’identifier les modes de connaissances auxquels se référent des individus qui font face à un risque empreint d’un niveau élevé d’incertitude scientifique. Comment ce public, mobilisé autour d’une problématique complexe, acquiert-il un niveau d’expertise suffisant pour comprendre les enjeux multiples (sociaux, économiques, éthiques, politiques et environnementaux) d’une technologie sur la société et ses modes d’organisation ? Quelle vision a-t-il des acteurs politiques et subpolitiques (Beck, 2001) qui prennent part aux débats ? Quel niveau de confiance accorde-t-il à un monde politique qui, en cas de risque majeur, pourrait invoquer une démarche précautionneuse et récupérer une partie du pouvoir décisionnel qui semblait lui échapper (Brunet, Delvenne & Joris, 2007) ? En situation de haute incertitude scientifique, qui sont les experts ? Quelle relation entretiennent les différents stakeholders 1 avec les autorités publiques? Le risque électromagnétique constitue un exemple éclairant de nouveau risque technologique, qui suscite une mobilisation sociale particulière et met en évidence les défis technologiques, sociaux, éthiques et politiques que nos sociétés occidentales doivent affronter à l’aube du XXIe siècle. [less ▲]

Detailed reference viewed: 144 (21 ULg)