Related Experiment Video
Updated: Feb 14, 2026

Whole Animal Perfusion Fixation for Rodents
Published on: July 30, 2012
Fixation distance and fixation duration to vertical road signs
Marco Costa1, Andrea Simone2, Valeria Vignali2
1Department of Psychology, University of Bologna, Viale Berti Pichat, 5, 40127 Bologna, Italy.
Abstract:
The distance of first-fixation to vertical road signs was assessed in 22 participants while driving a route of 8.34 km. Fixations to road signs were recorded by a mobile eye-movement-tracking device synchronized to GPS and kinematic data. The route included 75 road signs. First-fixation distance and fixation duration distributions were positively skewed. Median distance of first-fixation was 51 m. Median fixation duration was 137 ms with a modal value of 66 ms. First-fixation distance was linearly related to speed and fixation duration. Road signs were gazed at a much closer distance than their visibility distance. In a second study a staircase procedure was used to test the presentation-time threshold that lead to a 75% accuracy in road sign identification. The threshold was 35 ms, showing that short fixations to a road signs could lead to a correct identification.
Related Concept Videos
Fixation and Sectioning
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
Sight Distance in a Vertical Curve
Carbon-dioxide Fixation
Distance Problem
Design Example: Alignment of a Road Line Using GIS
Sign Convention
The normal force acts perpendicular to the beam's cross-section and can...

