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Experimental Brain Research

, Volume 232, Issue 9, pp 2891–2898 | Cite as

Afternystagmus in darkness after suppression of optokinetic nystagmus: an interaction of motion aftereffect and retinal afterimages

  • Chien-Cheng Chen
  • Melody Ying-Yu Huang
  • Konrad P. Weber
  • Dominik Straumann
  • Christopher J. Bockisch
Research Article

Abstract

The afternystagmus that occurs in the dark after gaze fixation during optokinetic stimulation is directed in the opposite direction relative to the previous optokinetic stimulus. The mechanism responsible for such afternystagmus after suppression of optokinetic nystagmus (ASOKN) is unclear. Several hypotheses have been put forward to explain it, but none is conclusive. We hypothesized that ASOKN is driven by the interaction of two mechanisms: (1) motion-aftereffect (MAE)-induced eye movements and (2) retinal afterimages (RAIs) produced by fixation during the suppression of optokinetic nystagmus (OKN). We examined the correlation among ASOKN, MAE-induced eye movements, and RAIs in healthy subjects. Adapting stimuli consisted of moving random dot patterns and a fixation spot and their brightness was adjusted to induce different RAI durations. Test patterns were a stationary random dot pattern (to test for the presence of a MAE), a dim homogeneous background (to test for MAE driven eye movements), and a black background (to test for ASOKN and RAIs). MAEs were reported by 16 out of 17 subjects, but only 7 out of 17 subjects demonstrated MAE-induced eye movements. Importantly, ASOKN was only found when these seven subjects reported a RAI after suppression of OKN. Moreover, the duration of ASOKN was longer for high-brightness stimuli compared with low-brightness stimuli, just as RAIs persist longer with increasing brightness. We conclude that ASOKN results from the interaction of MAE-induced eye movements and RAIs.

Keywords

Afternystagmus after suppression of optokinetic nystagmus (ASOKN) Motion aftereffect (MAE) Motion-aftereffect-induced eye movements Retinal afterimage (RAI) Human 

Notes

Acknowledgments

The authors like to thank Urs Scheifele and Marco Penner for excellent technical assistance. This work was supported by the Swiss National Science Foundation (SNF) grants PMPDP3_139754 (Marie Heim-Vögtlin programme) and 31003A-118069, Zurich Center for Integrative Human Physiology (ZIHP), and Betty and David Koetser Foundation for Brain Research.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Chien-Cheng Chen
    • 1
    • 5
  • Melody Ying-Yu Huang
    • 1
    • 4
  • Konrad P. Weber
    • 1
    • 2
  • Dominik Straumann
    • 1
    • 4
  • Christopher J. Bockisch
    • 1
    • 2
    • 3
  1. 1.Department of NeurologyUniversity Hospital ZurichZurichSwitzerland
  2. 2.Department of OphthalmologyUniversity Hospital ZurichZurichSwitzerland
  3. 3.Department of ENTUniversity Hospital ZurichZurichSwitzerland
  4. 4.Zurich Center for Integrative Human Physiology (ZIHP)ZurichSwitzerland
  5. 5.PhD Program in Integrative Molecular MedicineLife Science Graduate SchoolZurichSwitzerland

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