Sökning: "Psychophysics"

Visar resultat 1 - 5 av 18 avhandlingar innehållade ordet Psychophysics.

1. 1. Peripheral Vision : Adaptive Optics and Psychophysics

   Författare :Robert Rosén; Peter Unsbo; Larry Thibos; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis is about our peripheral vision. Peripheral vision is poor compared to central vision, due to both neural and optical factors. The optical factors include astigmatism, defocus and higher order aberrations consisting mainly of coma. Neurally, the density of ganglion cells decreases towards the periphery, which limits the sampling density. LÄS MER

3. 2. Tactile Perception - Role of Physical Properties

   Författare :Lisa Skedung; Mark Rutland; Katrin Danerlöv; Sören Andersson; Ann Maria Cornell; KTH; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Finger Friction; Skin Friction; Paper Friction; Friction Coefficient; Piezoelectric Force Sensor; Skin Tribology; Biotribology; Soft Tribology; Surface Roughness; Profilometry; Coated Paper; Uncoated Paper; Printing Paper; Magazine Paper; Tactile Perception; Psychophysics; Multidimensional Scaling; Magnitude Estimation; Paper Coarseness; Thermal Conductivity; X-ray Photoelectron Spectroscopy.; Chemistry; Kemi;

   Sammanfattning : The aim of this thesis is to interconnect human tactile perception with various physical properties of materials. Tactile perception necessitates contact and relative motion between the skin and the surfaces of interest. LÄS MER

4. 3. Sick of smells : Empirical findings and a theoretical framework for chemical intolerance

   Författare :Linus Andersson; Steven Nordin; Monique Smeets; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Chemical Intolerance; Unexplained Medical Symptoms; Environmental Intolerance; Event-related potentials; functional magnetic resonance imaging; psychophysics; sensitization; habituation; Psychology; psykologi;

   Sammanfattning : Chemical intolerance (CI) is a term that refers to the surprisingly common phenomenon of persons getting ill from everyday chemicals. Although seemingly similar to asthma and allergies, CI sufferers do not react to exposures with increased histamine release. LÄS MER

5. 4. Functional aspects of tactile directional sensibility

   Författare :Helena Backlund; Göteborgs universitet; []
   Nyckelord :Human; directional sensibility; hairy skin; hemispherectomy; postural control; glabrous skin; fMRI; psychophysics;

   Sammanfattning : Tactile directional sensibility, i.e. the ability to tell the movement direction of a moving tactile stimulus, depends on the parallel processing of spatiotemporal information and information about changes in the pattern of skin tension. LÄS MER

7. 5. On Perceived Exertion and its Measurement

   Författare :Elisabet Borg; Birgitta Berglund; Ana Garriga-Trillo; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Perceptual scaling; psychophysics; Category-Ratio scale; perceived exertion; interindividual comparisons; Psychology; Psykologi; psykologi; Psychology;

   Sammanfattning : The general aim of the thesis is to answer questions on general and differential aspects of perceived exertion and on the measurement of its intensity variation. Overall perceived exertion is commonly treated as a unidemensional construct. This thesis also explores its multidimensional character. Four empirical studies are summarized (Study I-IV). LÄS MER