40 research outputs found
Report drawn up on behalf of the Committee on Social Affairs and Employment on the proposal from the Commission of the European Communities to the Council (COM (84) 57 final - Doc. 1-147/84) for a directive on the principle of equal treatment for men and women in self-employed occupations, including agriculture, and on protection during pregnancy and maternity. Working Documents 1984-85, Document 1-214/84, 7 May 1984
Report drawn up on behalf of the Committee on the Environment, Public Health and Consumer Protection on the proposal form the Commission of the European Communities to the Council (Doc. 1-333/80) for a decision establishing a Community information system for preventing and combating hydrocarbon pollution of the sea. Working Documents 1980-1981, Document 1-709/80, 7 January 1981
Interim Report drawn up on behalf of the Committee on Social Affairs and Employment on the publication of the Commission of the European Communities entitled "Social Security Problems" (COM(82) 716 final). Working Documents 1984-1985, Document 1-45/84, 2 April 1984
Is Mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?
A stimulus that is flashed around the time of a saccade tends to be mislocalized in the direction of the saccade target. Our question is whether the mislocalization is related to the position of the saccade target within the image or to the gaze position at the end of the saccade. We separated the two with a visual illusion that influences the perceived distance to the target of the saccade and thus saccade endpoint without affecting the perceived position of the saccade target within the image. We asked participants to make horizontal saccades from the left to the right end of the shaft of a Müller-Lyer figure. Around the time of the saccade, we flashed a bar at one of five possible positions and asked participants to indicate its location by touching the screen. As expected, participants made shorter saccades along the fins-in (<->) configuration than along the fins-out (>-<) configuration of the figure. The illusion also influenced the mislocalization pattern during saccades, with flashes presented with the fins-out configuration being perceived beyond flashes presented with the fins-in configuration. The difference between the patterns of mislocalization for bars flashed during the saccade for the two configurations corresponded quantitatively with a prediction based on compression towards the saccade endpoint considering the magnitude of the effect of the illusion on saccade amplitude. We conclude that mislocalization is related to the eye position at the end of the saccade, rather than to the position of the saccade target within the image
Interfacial separation between elastic solids with randomly rough surfaces: comparison of experiment with theory
We study the average separation between an elastic solid and a hard solid
with a nominal flat but randomly rough surface, as a function of the squeezing
pressure. We present experimental results for a silicon rubber (PDMS) block
with a flat surface squeezed against an asphalt road surface. The theory shows
that an effective repulse pressure act between the surfaces of the form p
proportional to exp(-u/u0), where u is the average separation between the
surfaces and u0 a constant of order the root-mean-square roughness, in good
agreement with the experimental results.Comment: 6 pages, 10 figure
Crossmodal duration perception involves perceptual grouping, temporal ventriloquism, and variable internal clock rates
Here, we investigate how audiovisual context affects perceived event duration with experiments in which observers reported which of two stimuli they perceived as longer. Target events were visual and/or auditory and could be accompanied by nontargets in the other modality. Our results demonstrate that the temporal information conveyed by irrelevant sounds is automatically used when the brain estimates visual durations but that irrelevant visual information does not affect perceived auditory duration (Experiment 1). We further show that auditory influences on subjective visual durations occur only when the temporal characteristics of the stimuli promote perceptual grouping (Experiments 1 and 2). Placed in the context of scalar expectancy theory of time perception, our third and fourth experiments have the implication that audiovisual context can lead both to changes in the rate of an internal clock and to temporal ventriloquism-like effects on perceived on- and offsets. Finally, intramodal grouping of auditory stimuli diminished any crossmodal effects, suggesting a strong preference for intramodal over crossmodal perceptual grouping (Experiment 5)