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Eye movements between saccades: Measuring ocular drift and tremor.

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Title: Eye movements between saccades: Measuring ocular drift and tremor.
Authors: Ko, Hee-kyoung1, Snodderly, D. Max1, Poletti, Martina2 martinap@bu.edu
Source: Vision Research. May2016, Vol. 122, p93-104. 12p.
Subjects: Saccadic eye movements, Tremor, Motion perception (Vision), Retina physiology, Optical resolution, Animal experimentation, Animals, Eye movements, Primates, Research funding, Eye movement measurements, Equipment & supplies
Abstract: Intersaccadic periods of fixation are characterized by incessant retinal motion due to small eye movements. While these movements are often disregarded as noise, the temporal modulations they introduce to retinal receptors are significant. However, analysis of these input modulations is challenging because the intersaccadic eye motion is close to the resolution limits of most eyetrackers, including widespread pupil-based video systems. Here, we analyzed in depth the limits of two high-precision eyetrackers, the Dual-Purkinje Image and the scleral search coil, and compared the intersaccadic eye movements of humans to those of a non-human primate. By means of a model eye we determined that the resolution of both techniques is sufficient to reliably measure intersaccadic ocular activity up to approximately 80Hz. Our results show that the characteristics of ocular drift are remarkably similar in the two species; a clear deviation from a scale-invariant spectrum occurs in the range between 50 and 100Hz, generally attributed to ocular tremor, leading to intersaccadic retinal speeds as high as 1.5deg/s. The amplitude of this deviation differs on the two axes of motion. In addition to our experimental observations, we suggest basic guidelines to evaluate the performance of eyetrackers and to optimize experimental conditions for the measurement of ocular drift and tremor. [ABSTRACT FROM AUTHOR]
Copyright of Vision Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 115211951
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Eye movements between saccades: Measuring ocular drift and tremor.
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  Data: <searchLink fieldCode="AR" term="%22Ko%2C+Hee-kyoung%22">Ko, Hee-kyoung</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Snodderly%2C+D%2E+Max%22">Snodderly, D. Max</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Poletti%2C+Martina%22">Poletti, Martina</searchLink><relatesTo>2</relatesTo><i> martinap@bu.edu</i>
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  Data: Intersaccadic periods of fixation are characterized by incessant retinal motion due to small eye movements. While these movements are often disregarded as noise, the temporal modulations they introduce to retinal receptors are significant. However, analysis of these input modulations is challenging because the intersaccadic eye motion is close to the resolution limits of most eyetrackers, including widespread pupil-based video systems. Here, we analyzed in depth the limits of two high-precision eyetrackers, the Dual-Purkinje Image and the scleral search coil, and compared the intersaccadic eye movements of humans to those of a non-human primate. By means of a model eye we determined that the resolution of both techniques is sufficient to reliably measure intersaccadic ocular activity up to approximately 80Hz. Our results show that the characteristics of ocular drift are remarkably similar in the two species; a clear deviation from a scale-invariant spectrum occurs in the range between 50 and 100Hz, generally attributed to ocular tremor, leading to intersaccadic retinal speeds as high as 1.5deg/s. The amplitude of this deviation differs on the two axes of motion. In addition to our experimental observations, we suggest basic guidelines to evaluate the performance of eyetrackers and to optimize experimental conditions for the measurement of ocular drift and tremor. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Vision Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.visres.2016.03.006
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 93
    Subjects:
      – SubjectFull: Saccadic eye movements
        Type: general
      – SubjectFull: Tremor
        Type: general
      – SubjectFull: Motion perception (Vision)
        Type: general
      – SubjectFull: Retina physiology
        Type: general
      – SubjectFull: Optical resolution
        Type: general
      – SubjectFull: Animal experimentation
        Type: general
      – SubjectFull: Animals
        Type: general
      – SubjectFull: Eye movements
        Type: general
      – SubjectFull: Primates
        Type: general
      – SubjectFull: Research funding
        Type: general
      – SubjectFull: Eye movement measurements
        Type: general
      – SubjectFull: Equipment & supplies
        Type: general
    Titles:
      – TitleFull: Eye movements between saccades: Measuring ocular drift and tremor.
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            NameFull: Ko, Hee-kyoung
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            NameFull: Snodderly, D. Max
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            NameFull: Poletti, Martina
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              Text: May2016
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              Value: 122
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