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Home Research Topics Microsaccades Rolfs et al. (2008, JEMR). Microsaccade-induced prolongation of saccadic latencies depends on microsaccade amplitude

Rolfs et al. (2008, JEMR). Microsaccade-induced prolongation of saccadic latencies depends on microsaccade amplitude

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Rolfs, M., Laubrock, J., & Kliegl, R. (2008). Microsaccade-induced prolongation of saccadic latencies depends on microsaccade amplitude. Journal of Eye Movement Research, 1(3):1, 1-8.

Abstract. Fixations consist of small movements including microsaccades, i.e., rapid flicks in eye position that replace the retinal image by up to 1 degree of visual angle. Recently, we showed in a delayed-saccade task (1) that the rate of microsaccades decreased in the course of saccade preparation and (2) that microsaccades occurring around the time of a go signal were associated with prolonged saccade latencies (Rolfs et al., 2006). A re-analysis of the same data set revealed a strong dependence of these findings on microsaccade amplitude. First, microsaccade amplitude dropped to a minimum just before the generation of a saccade. Second, the delay of response saccades was a function of microsaccade amplitude: Microsaccades with larger amplitudes were followed by longer response latencies. These finding were predicted by a recently proposed model that attributes microsaccade generation to fixation-related activity in a saccadic motor map that is in competition with the generation of large saccades (Rolfs et al., 2008). We propose, therefore, that microsaccade statistics provide a behavioral correlate of fixation-related activity in the oculomotor system.

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Last Updated on Thursday, 26 August 2010 12:39  

Comments  

 
+1 #1 Reinhold Kliegl 2010-08-14 09:33
This script contains a straightforward example of visualizing an interaction between two continuous independent variables.
DV: reaction time, IV1: microsaccade onset, IV2: microsaccade amplitude
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