Papers by Paul van Diepen
Current oculomotor research: …, Jan 1, 1999
Page 271. 36 THE USE OF COARSE AND FINE PERIPHERAL INFORMATION DURING THE FINAL PART OF FIXATIONS... more Page 271. 36 THE USE OF COARSE AND FINE PERIPHERAL INFORMATION DURING THE FINAL PART OF FIXATIONS IN SCENE PERCEPTION Martien Wampers and Paul MJ van Diepen University of Leuven, Belgium ...
Trends in cognitive psychology, Jan 1, 2002
Page 201. Chapter 8 Foveal Stimulus Degradation during Scene Perception Paul MJ van Diepen Labora... more Page 201. Chapter 8 Foveal Stimulus Degradation during Scene Perception Paul MJ van Diepen Laboratory of Experimental Psychology University of Leuven, Belgium Abstract Two experiments are reported using eye-contingent display changes during scene perception. ...
Spatial vision, Jan 1, 1997
Moving-mask and moving-window paradigms are used to study the spatial and temporal aspects of vis... more Moving-mask and moving-window paradigms are used to study the spatial and temporal aspects of visual information processing. Due to technical limitations, these paradigms have frequently been applied to reading, but only rarely to scene perception. Existing moving-mask or moving-window techniques for graphical stimuli usually blank the display inside or outside a square window, respectively. A new moving-window technique is presented here that uses a purpose-designed video switcher and three synchronized video boards. The first video board contains the stimulus presented inside the window. The second video board contains the stimulus to be presented outside the window. The third video board contains a black-and-white image of the window that is used as a key signal for the video switcher. The video switcher selects between the video signals of the first and the second video board on a pixel-by-pixel basis, controlled by the key signal generated by the third video board. By panning the image of the third video board, the window can be moved very rapidly. Here we use oval windows, centered on the fixation spot as measured by an eye-tracker. The normal stimulus is visible inside the window, whereas manipulated information is presented outside the window, or vice versa.
Behavior Research …, Jan 1, 1994
In reading research, the moving mask and moving window paradigms have proved to be invaluable in ... more In reading research, the moving mask and moving window paradigms have proved to be invaluable in determining the chronometric and spatial characteristics of processing written text. The success ofthese methods has lead to a demand for their application in research on real-world scene perception. However, we will argue that the technical implementation of eye-contingent mask (window) movement across a stable text cannot be applied to scene research. A new technique is proposed that allows graphical masks or windows of arbitrary form, size, and content to be moved quickly over a complex graphical stimulus. This moving overlay technique makes use of the ATVista graphics adapter, a board with the ability to mix an internally stored and an externally generated image into one composite image. A high-performance moving mask or window is created by programming the internal image to be movable and partly transparent. The technique is implemented on a standard personal computer interfaced with an eyetracker, thus bringing mask (window) movement under online eye-movement control. Wediscuss general principles of the technique and illustrate them with performance data from a concrete experimental setup.
Acta Psychologica, Jan 1, 1999
In the present experiment, participants were exploring line drawings of scenes in the context of ... more In the present experiment, participants were exploring line drawings of scenes in the context of an object-decision task, while eye-contingent display changes manipulated the appearance of the foveal part of the image. Foveal information was replaced by an ovoid noise mask for 83 ms, after a preset delay of 15, 35, 60, or 85 ms following the onset of fixations. In control conditions, a red ellipse appeared for 83 ms, centered around the fixation position, after the same delays as in the noise-mask conditions. It was found that scene exploration was hampered especially when foveal masking occurred early during fixations, replicating earlier findings. Furthermore, fixation durations were shown to increase linearly as the mask delay decreased, which validates the fixation duration as a measure of perceptual processing speed.
Visual Cognition, Jan 1, 2003
To compare early foveal and peripheral information extraction, visual scenes were masked either f... more To compare early foveal and peripheral information extraction, visual scenes were masked either foveally or peripherally during the initial part of fixations, using an eye-movement contingent display-change technique. The sequential attention model of eye-movement ...
PERCEPTION-LONDON-, Jan 1, 1998
Eye guidance in reading …, Jan 1, 1998
... Both Shioiri and Ikeda (1989) and McConkie and Loschky (1997, Experiment 2) used a memorizati... more ... Both Shioiri and Ikeda (1989) and McConkie and Loschky (1997, Experiment 2) used a memorization task, but memory for scene identity was tested in the first study, whereas memory for picture details was tested in the latter. ...
Studies in Visual Information …, Jan 1, 1995
The moving mask paradigm was applied to scene perception, to determine whether there exists a fix... more The moving mask paradigm was applied to scene perception, to determine whether there exists a fixed, privileged period for foveal information extraction at the beginning of each fixation. Subjects freely explored line drawings of realistic scenes in the context of a search task during ...
Uploads
Papers by Paul van Diepen