- Scientific publications
Stimulus contrast and location
Scientists from the University of Latvia study these rapid eye movements in meticulous detail. One of their recent work looked into how saccade eye movements are affected by stimulus position and contrast. In simple words, they wanted to know if saccadic eye movements change depending on where the thing you are looking at is and how noticeable something is compared to its surroundings. The study participants were presented with visual targets (a dot on a screen) with varying levels of contrast and at different positions on the screen. The study was designed using
Tobii Pro Lab software, and the eye movements were recorded with the
Tobii Pro Fusion eye tracker.
The scientists looked into the following saccadic performance measurements:
The study results showed that the stimulus’s spatial positioning significantly affected saccade accuracy and latency. The best saccadic eye movement performance was observed when saccades were oriented to the left or right in a horizontal plane. When the stimulus was on a medium grey or black background, saccades to the right and left from the central point yielded the best performance. A low-contrast stimulus on a light grey background resulted in the worst performance.
The study results suggest that saccadic eye movements are the quickest and most accurate when viewing objects in a horizontal plane and high contrast. Those studying saccades in the vertical plane might want to bear in mind that the saccade performance might not be comparable to those studied on a horizontal plane. Also, the background color matters – using different contrast stimuli on a medium grey or black background might help get the best saccade performance, while very low-contrast stimuli might worsen accuracy and speed measurements.
Goliskina, V.; Ceple, I.; Kassaliete, E.; Serpa, E.; Truksa, R.; Svede, A.; Krauze, L.; Fomins, S.; Ikaunieks, G.; Krumina, G. The Effect of Stimulus Contrast and Spatial Position on Saccadic Eye Movement Parameters. Vision 2023, 7, 68.
Interested in similar articles? Visit our scientific publication hub to see all our scientific publication highlights.
SCIENCE WRITER, TOBII
As a science writer, I get to read peer-reviewed publications and write about the use of eye tracking in scientific research. I love discovering the new ways in which eye tracking advances our understanding of human cognition.
During social interactions, eye gaze carries a wealth of information about our attention, intention, or psychological state. Researchers recorded the looking behavior in live interaction.
Studies show that people with social anxiety pay more attention to negative facial expressions. An eye tracking study confirmed this theory and revealed that training people to focus on positive stimuli can lead to a reduction in this bias.
Researchers from University of Chicago used eye tracking to evaluate social attention in two different cultural populations, urban North American participants, and rural Yucatec Mayan participants.