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Removal of eye movement artefacts from single channel recordings of retinal evoked potentials using synchronous dynamical embedding and independent component analysis

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Abstract

A system is described for the removal of eye movement and blink artefacts from single channel pattern reversal electroretinogram recordings of very poor signal-to-noise ratios. Artefacts are detected and removed by using a blind source separation technique based on the jadeR independent component analysis algorithm. The single channel data are arranged as a series of overlapping time-delayed vectors forming a dynamical embedding matrix. The structure of this matrix is constrained to the phase of the stimulation epoch: the term synchronous dynamical embedding is coined. A novel method using a marker channel with a non-independent synchronous feature is employed to identify the single most relevant source estimation for reconstruction and signal recovery. This method is non-lossy, all underlying signal being recovered. In synthetic datasets of defined noise content and in standardised real data recordings, the performance of this technique is compared to conventional fixed-threshold hard-limit rejection. The most significant relative improvements are achieved when movement and blink artefacts are greatest: no improvement is demonstrable for the random noise only situation.

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Authors and Affiliations

  1. Department of Clinical Engineering, Royal Liverpool University Hospital, Medical School, Duncan Building, Prescot Street, Liverpool, L78XP, UK

    A. C. Fisher, R. P. Hagan & M. C. Brown

  2. The Clinical Eye Research Centre, Royal Liverpool University Hospital, Medical School, Duncan Building, Prescot Street, Liverpool, L78XP, UK

    A. C. Fisher, R. P. Hagan & M. C. Brown

  3. School of Psychological Sciences, University of Manchester, Manchester, UK

    W. El-Deredy

  4. Deptartment of Computer & Mathematical Sciences, Liverpool John Moores University, Liverpool, UK

    P. J. G. Lisboa

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  1. A. C. Fisher
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  2. W. El-Deredy
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  3. R. P. Hagan
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  4. M. C. Brown
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  5. P. J. G. Lisboa
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Correspondence to A. C. Fisher.

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Fisher, A.C., El-Deredy, W., Hagan, R.P. et al. Removal of eye movement artefacts from single channel recordings of retinal evoked potentials using synchronous dynamical embedding and independent component analysis. Med Bio Eng Comput 45, 69–77 (2007). https://doi.org/10.1007/s11517-006-0123-4

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  • DOI: https://doi.org/10.1007/s11517-006-0123-4

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