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  • Research Article
  • Open Access

Comparison of Synchronization Indices: Behavioral Study

  • 1,
  • 2Email author and
  • 3
EURASIP Journal on Advances in Signal Processing20092009:510235

  • Received: 4 September 2008
  • Accepted: 1 April 2009
  • Published:


The synchronization of a neuronal response to a given periodic stimulus is usually measured by Goldberg and Brown's vector strength metric. This index does not take omitted spikes into account. This particular limitation has motivated the development of two new indices: the corrected vector strength index and the corrected phase variance index, both including a penalty factor linked to the firing rate. In this paper, a theoretical study on the normalization of the corrected phase variance index is conducted. Both indices are compared to four existing ones using a simulated dataset which considers three desynchronizing disturbances: irregularity in firing, added spikes, and omitted spikes. In the case of unimodal responses, the two new indices are satisfying and appear the more promising in the case of real signals. In the multimodal case, the entropy-based index is better than the others even if this index is not drawback-free.


  • Information Technology
  • Firing Rate
  • Quantum Information
  • Behavioral Study
  • Phase Variance

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Authors’ Affiliations

INSERM, U642, 35000 Rennes, France
LTSI, Université de Rennes 1, 35000 Rennes, France
LTSI, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France


© Pierre Dugué et al. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.