Shortening and Prolongation of Saccade Latencies Following Microsaccades
- When the eyes fixate at a point in a visual scene, small saccades rapidly shift the image on the retina. The effect of these microsaccades on the latency of subsequent large-scale saccades may be twofold. First, microsaccades are associated with an enhancement of visual perception. Their occurrence during saccade target perception should, thus, decrease saccade latencies. On the other hand, microsaccades likely indicate activity in fixation-related oculomotor neurons. These represent competitors to saccade-related cells in the interplay of gaze holding and shifting. Consequently, an increase in saccade latencies after microsaccades would be expected. Here, we present evidence for both aspects of microsaccadic impact on saccade latency. In a delayed response task, participants made saccades to visible or memorized targets. First, microsaccade occurrence up to 50 ms before target disappearance correlated with 18 ms (or 8%) faster saccades to memorized targets. Second, if microsaccades occurred shortly (i.e., < 150 ms) before a saccadeWhen the eyes fixate at a point in a visual scene, small saccades rapidly shift the image on the retina. The effect of these microsaccades on the latency of subsequent large-scale saccades may be twofold. First, microsaccades are associated with an enhancement of visual perception. Their occurrence during saccade target perception should, thus, decrease saccade latencies. On the other hand, microsaccades likely indicate activity in fixation-related oculomotor neurons. These represent competitors to saccade-related cells in the interplay of gaze holding and shifting. Consequently, an increase in saccade latencies after microsaccades would be expected. Here, we present evidence for both aspects of microsaccadic impact on saccade latency. In a delayed response task, participants made saccades to visible or memorized targets. First, microsaccade occurrence up to 50 ms before target disappearance correlated with 18 ms (or 8%) faster saccades to memorized targets. Second, if microsaccades occurred shortly (i.e., < 150 ms) before a saccade was required, saccadic reaction times in visual and memory trials were increased by about 40 ms (or 16%). Hence, microsaccades can have opposite consequences for saccade latencies, pointing at a differential role of these fixational eye movements in preparation of motor programs.…
Author details: | Martin Rolfs, Jochen LaubrockORCiDGND, Reinhold KlieglORCiDGND |
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URN: | urn:nbn:de:kobv:517-opus-57012 |
Publication series (Volume number): | Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe (paper 242) |
Publication type: | Postprint |
Language: | English |
Publication year: | 2006 |
Publishing institution: | Universität Potsdam |
Release date: | 2011/12/09 |
Tag: | Fixational eye movements; Memory-guided saccades; Visually-guided saccades |
Source: | Experimental Brain Research. - ISSN: 0014-4819. - 169 (2006),3 , S. 369-376 |
Organizational units: | Humanwissenschaftliche Fakultät / Strukturbereich Kognitionswissenschaften / Department Psychologie |
DDC classification: | 4 Sprache / 40 Sprache / 400 Sprache |
Institution name at the time of the publication: | Humanwissenschaftliche Fakultät / Institut für Psychologie |
License (German): | Keine öffentliche Lizenz: Unter Urheberrechtsschutz |
External remark: | The original publication is available at www.springerlink.com: DOI:10.1007/s00221-005-0148-1 |