Search results for "perception"
showing 10 items of 3634 documents
Amygdala response to anticipation of dyspnea is modulated by 5-HTTLPRgenotype
2015
Dyspnea anticipation and perception varies largely between individuals. To investigate whether genetic factors related to negative affect such as the 5-HTTLPR polymorphism impact this variability, we investigated healthy, 5-HTTLPR stratified volunteers using resistive load induced dyspnea together with fMRI. Alternating blocks of severe and mild dyspnea ("perception") were differentially cued ("anticipation") and followed by intensity and unpleasantness ratings. In addition, volunteers indicated their anticipatory fear during the anticipation periods. There were no genotype-based group differences concerning dyspnea intensity and unpleasantness or brain activation during perception of sever…
Children's and adolescents’ harmonisation of a tonal melody
2009
Although several cross-sectional age-related studies of harmonic perception in children have been performed, studies of harmonisation are very few. In the present study, the ability of school-aged children and adolescents to add chords to an ongoing tonal melody is investigated. Age-related development of harmonic features, chord rhythm and types of harmonisation are analysed. Six to fifteen-year-old participants (N=44) harmonised a C-major tonal melody. Four keys of the synthesiser, each producing a whole major triad (C, D, F and G), were used in real-time chord production. The frequency of chord I as the final chord, distribution of chords in strong metrical positions and number of period…
Distinctive body perception mechanisms in high versus low symptom reporters: A neurophysiological model for medically-unexplained symptoms.
2020
Abstract Objective The neurophysiological processes involved in the generation of medically-unexplained symptoms (MUS) remain unclear. This study tested three assumptions of the perception-filter model contributing to MUS: (I.) increased bodily signal strength (II.) decreased filter function, (III.) increased perception. Methods In this cross-sectional, observational study, trait MUS were assessed by a web-based survey (N = 486). The upper and lower decile were identified as extreme groups of high (HSR; n = 29; 26 women; Mage = 26.0 years) and low symptom reporters (LSR; n = 29; 21 women; Mage = 28.4 years). Mean heart rate (HR) and heart rate variability (HRV), and cortisol awakening respo…
Time perception in depression: a meta-analysis.
2014
Background Depressive patients frequently report to perceive time as going by very slowly. Potential effects of depression on duration judgments have been investigated mostly by means of four different time perception tasks: verbal time estimation, time production, time reproduction, and duration discrimination. Ratings of the subjective flow of time have also been obtained. Methods By means of a classical random-effects meta-regression model and a robust variance estimation model, this meta-analysis aims at evaluating the inconsistent results from 16 previous studies on time perception in depression, representing data of 433 depressive patients and 485 healthy control subjects. Results Dep…
The influence of isolated small nerve fibre dysfunction on microvascular control in patients with diabetes mellitus
2001
Aim The aim of the study was to investigate the influence of isolated small nerve fibre dysfunction on microvascular skin blood flow and transcutaneous oxygen tension in patients with diabetes mellitus. Methods Small nerve fibre dysfunction was assessed by the measurement of thermal and pain perception thresholds. Patients with evidence of large fibre disturbances as evaluated by means of vibration perception threshold were excluded from the study. Microvascular blood flow was investigated with laser-Doppler-fluxmetry (LDF) following stimulation with acetylcholine and mild thermal injury. Results Diabetic patients with small nerve fibre injury showed a significantly reduced increase in th…
Second to fourth digit ratio (2D:4D) of the right hand is associated with nociception and augmenting-reducing
2008
The ratio of the length of the second and fourth fingers (2D:4D) represents an individual difference variable putatively related to prenatal testosterone exposure. Previous research found significant associations between this variable and sexually dimorphic and other sex-hormone mediated traits like fertility, masculinity, spatial ability and sensation seeking. The present study aimed to relate digit ratio to pain perception using electric pain stimuli. 131 volunteers (69 females) participated. Two electric stimuli of different intensity were applied to the forearm. Digit ratio was obtained from the left and right hands and pain tolerance was assessed by means of visual analog scales. Addit…
Avoidant coping, verbal-autonomic response dissociation and pain tolerance
2006
Higher autonomic reactivity relative to self-reported discomfort, often found in repressors and avoidant copers might be associated with a diminished perception of bodily symptoms. This study aimed at relating such so-called verbal-autonomic response dissociation to pain tolerance. Eighty-five volunteers underwent a public speaking task and a cold pressor test. Heart rate and negative affect in response to the speech, and pain ratings and facial muscle responses for the cold pressor were obtained. A dissociation score was calculated for each individual in response to speech, thereby subtracting standardized changes in negative affect from standardized changes in heart rate. Response dissoci…
Cultural approach to the perception of risk: analysing concern about the siting of a high-level nuclear waste facility in Finland
1999
A study of local residents' attitudes toward the siting of a high-level nuclear waste facility in Finland was undertaken in three municipalities (Eurajoki, Kuhmo and Aänekoski) that are being considered possible host communities for the facility. The results of the survey show that opposition to the facility is quite strong in two of the three municipalities, while in the third a polarization of opinions into two opposing camps is evident. The size, social structure and substance of the local opposition and support are analysed. The thesis of the paper is that in order to understand different opinions about the facility, one must understand the cultural logic of risk perception. People eva…
Clinical and logopaedic results of simultaneous and sequential bilateral implants in children with severe and/or profound bilateral sensorineural hea…
2015
This article carries out a literature review of the advantages and limitations of the simultaneous bilateral cochlear implantation (SCI) compared to those of the sequential bilateral cochlear implantation (SBCI) and the unilateral cochlear implantation (UCI). The variables analysed in said comparison are: safety and surgical technique, SCI incidence, effectiveness, impact of the inter-implant interval, costs and financing, impact on brain plasticity, impact on speech and language development, main benefits, main disadvantages and concerns, and predictive factors of prognosis. Although the results are not conclusive, all variables analysed seem to point towards observable benefits of SCI in …
Low intensity magnetic field influences short-term memory: A study in a group of healthy students
2015
This study analyzes if an external magnetic stimulus (2 kHz and approximately 0.1 μT applied near frontal cortex) influences working memory, perception, binary decision, motor execution, and sustained attention in humans. A magnetic stimulus and a sham stimulus were applied to both sides of the head (frontal cortex close to temporal-parietal area) in young and healthy male test subjects (n = 65) while performing Sternberg's memory scanning task. There was a significant change in reaction time. Times recorded for perception, sustained attention, and motor execution were lower in exposed subjects (P < 0.01). However, time employed in binary decision increased for subjects exposed to magnetic …