Abstract
BackgroundObservers misperceive the location of points within a scene as compressed towards the goal of a saccade. However, recent studies suggest that saccadic compression does not occur for discrete elements such as dots when they are perceived as unified objects like a rectangle.Methodology/Principal FindingsWe investigated the magnitude of horizontal vs. vertical compression for Kanizsa figure (a collection of discrete elements unified into single perceptual objects by illusory contours) and control rectangle figures. Participants were presented with Kanizsa and control figures and had to decide whether the horizontal or vertical length of stimulus was longer using the two-alternative force choice method. Our findings show that large but not small Kanizsa figures are perceived as compressed, that such compression is large in the horizontal dimension and small or nil in the vertical dimension. In contrast to recent findings, we found no saccadic compression for control rectangles.ConclusionsOur data suggest that compression of Kanizsa figure has been overestimated in previous research due to methodological artifacts, and highlight the importance of studying perceptual phenomena by multiple methods.
Highlights
Several lines of evidence demonstrate that observers misperceive the location of points within a visual scene presented at about the time of a saccade [1]
Morrone, and Burr [3] were the first to report that when observers are provided with a visual reference, such as a ruler, throughout the duration of a trial, the apparent location of the flash presented around the time of saccades shifts toward the saccade target as if the visual space surrounding the saccadic target was compressed
Whether the points of visual space are mislocalized along the same uniform direction or whether they are perceived as compressed towards the saccadic target seems to depend crucially on provision of a visual reference [4]
Summary
Several lines of evidence demonstrate that observers misperceive the location of points within a visual scene presented at about the time of a saccade [1]. Honda [2] required participants sitting in complete darkness to locate a single flash of light presented in various locations around the saccadic target shortly before, during, or after the saccade He reported that a flash presented briefly before a saccade is perceived as shifted in the direction of the saccade. Morrone, and Burr [3] were the first to report that when observers are provided with a visual reference, such as a ruler, throughout the duration of a trial, the apparent location of the flash presented around the time of saccades shifts toward the saccade target as if the visual space surrounding the saccadic target was compressed. Whether the points of visual space are mislocalized along the same uniform direction or whether they are perceived as compressed towards the saccadic target seems to depend crucially on provision of a visual reference [4]. Recent studies suggest that saccadic compression does not occur for discrete elements such as dots when they are perceived as unified objects like a rectangle
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
