Effects of Visual Environment Complexity on Saccade Performance in Humans with Different Functional Asymmetry Profiles

Abstract

Studies in 47 right-handed subjects with right and left leading eyes addressed the latent periods of visually-evoked saccades in the horizontal, vertical, and diagonal directions within the field of vision. Visual environments with three levels of temporospatial complexity and two standard time protocols of visual stimulation, with "gap" and "overlap," were used. In subjects with left leading eyes, saccades were more often performed with shorter latent periods in the direction ipsilateral to the leading eye than in the contralateral direction (53% versus 20%); among subjects with right leading eyes, the proportions with decreases in the latent periods in the ipsi- and contralateral directions were different (25% and 22%, respectively). Thus, there was a relationship between eye dominance and the spatial asymmetry of the latent periods of saccades.

How Eye Dominance Strength Modulates the Influence of a Distractor on Saccade Accuracy

“…Very few studies have evaluated the effect of eye dominance but again without consistent results. 2,21,22 The present study tested these asymmetries on a large sample of participants, and failed to find any left-right asymmetries on saccade latency. The fact that RDE did not differ between the two hemifields in participants with strong eye dominance suggests that eye dominance does not influence saccade latency, at least in the conditions we tested.…”

“…Participants with a strong right DE seemed to show the reverse effect, with a distractor impact greater in the right than in the left hemifield, but the difference failed to reach the significance threshold ( Fig. 3a; F [1,21] ¼ 2.92, P < 0.10). However, it should be noted that an effect of eye dominance strength was found in the right hemifield in participants with a right DE (F [1,55] Participants were categorized into four groups according to their eye dominance (right DE; left DE) and eye dominance strength (strong; weak).…”

Analysis of Reflexive Eye Movements for Fast Replay-Resistant Biometric Authentication

“…Furthermore, taking into account the advantage in faster elicitation times, the goal of our research is to design a stimulus that supports the use of reflexive saccades for biometric authentication. For example, prior research has shown that saccade latencies depend on the dominant eye [32] of the individual, which is a stable characteristic and provides strong motivation for using saccade latencies for classification. Finally, it was shown that saccade latency varies if anticipation (temporal expectancy) is present [46].…”

Using Reflexive Eye Movements for Fast Challenge-Response Authentication

“…Furthermore, taking into account the advantage in faster elicitation times, the goal of our research is to design a stimulus that supports the use of reflexive saccades for biometric authentication. For example, prior research has shown that saccade latencies depend on the dominant eye [31,26] of the individual, which is a stable characteristic and provides strong motivation for using saccade latencies for classification. Finally, it was shown that saccade latency varies if anticipation (temporal expectancy) is present [40].…”