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Article History

Received: 30 April 2014

Accepted: 29 July 2014

First Online: 31 August 2014

Change Date: 4 September 2014

Change Type: Correction

Change Details: In the version of this supplementary file originally posted online, there were several errors because an obsolete version was posted. The supplementary figures were misnumbered (1 as 4, 2 as 5, 3 as 6, 4 as 7, 5 as 8, 6 as 1, 7 as 2, and 8 as 3). In Supplementary Figure 2b, the comma was missing after "consecutive intervals." Supplementary Figure 3 referred to "equal quantile buckets," "saccade-locked kernel" and "effect from the model" instead of "equal-quantile buckets," "saccade-locked kernels" and "effect predicted from the model." The Supplementary Figure 4 legend read "exponential model is better" where it should have read "exponential model better fits the data." Supplementary Figure 9 referred to a Table 1 instead of Supplementary Table 1. The title for Supplementary Table 1 was absent, and the legend referred to the "first 3 singular values" instead of "first 3 singular vectors." In addition, there were four instances in the PDF version where a figure or table citation was replaced or accompanied by "Error! Reference source not found." The errors have been corrected in this file as of 4 September 2014.

Competing interests

: The authors declare no competing financial interests.