August 2009
Volume 9, Issue 8
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2009
Saccades and microsaccades during visual fixation, exploration, and search: Foundations for a common saccadic generator
Author Affiliations
  • Xoana Troncoso
    Barrow Neurological Institute, Phoenix, AZ, USA
  • Jorge Otero-Millan
    Barrow Neurological Institute, Phoenix, AZ, USA, and University of Vigo, Vigo, Spain
  • Stephen Macknik
    Barrow Neurological Institute, Phoenix, AZ, USA
  • Ignacio Serrano-Pedraza
    Barrow Neurological Institute, Phoenix, AZ, USA
  • Susana Martinez-Conde
    Barrow Neurological Institute, Phoenix, AZ, USA
Journal of Vision August 2009, Vol.9, 447. doi:10.1167/9.8.447
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      Xoana Troncoso, Jorge Otero-Millan, Stephen Macknik, Ignacio Serrano-Pedraza, Susana Martinez-Conde; Saccades and microsaccades during visual fixation, exploration, and search: Foundations for a common saccadic generator. Journal of Vision 2009;9(8):447. doi: 10.1167/9.8.447.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Microsaccades are known to occur during prolonged visual fixation, but it is a matter of controversy whether they also happen during free-viewing. Here we set out to determine: 1) whether microsaccades occur during free visual exploration and visual search, 2) whether microsaccade dynamics vary as a function of visual stimulation and viewing task, and 3) whether saccades and microsaccades share characteristics that might argue in favor of a common saccade-microsaccade oculomotor generator. Human subjects viewed naturalistic stimuli while performing various viewing tasks, including visual exploration, visual search, and prolonged visual fixation. Their eye movements were simultaneously recorded with high precision. Our results show that microsaccades are produced during the fixation periods that occur during visual exploration and visual search. Microsaccade dynamics during free-viewing moreover varied as a function of visual stimulation and viewing task, with increasingly demanding tasks resulting in increased microsaccade production. Moreover, saccades and microsaccades had comparable spatiotemporal characteristics, including the presence of equivalent refractory periods between all pair-wise combinations of saccades and microsaccades. Thus our results indicate a microsaccade-saccade continuum and support the hypothesis of a common oculomotor generator for saccades and microsaccades.

Troncoso, X. Otero-Millan, J. Macknik, S. Serrano-Pedraza, I. Martinez-Conde, S. (2009). Saccades and microsaccades during visual fixation, exploration, and search: Foundations for a common saccadic generator [Abstract]. Journal of Vision, 9(8):447, 447a, http://journalofvision.org/9/8/447/, doi:10.1167/9.8.447. [CrossRef]
Footnotes
 Study funded by: Barrow Neurological Foundation, NSF, Arizona Biomedical Research Commission, and Science Foundation Arizona. XGT is a fellow of the Caja Madrid Foundation.
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