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. 2014 May 27;1:140003. doi: 10.1038/sdata.2014.3

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Copyright © 2014, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 3.0 Unported License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/. Metadata associated with this Data Descriptor is available at http://www.nature.com/sdata/ and is released under the CC0 waiver to maximize reuse.

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Stimulus synchronization and timing accuracy. (a) Schema for movie segment transitions and synchronization with the MRI scanner's volume acquisition trigger signal. The solid black line shows the relative stimulus volume at the beginning and end of a movie segment. (b) Histogram of inter-trigger pulse duration deviations from the target duration of 2 s – as recorded by the stimulus software. This is an estimate of the temporal uncertainty of the timing information. Trigger pulses are sent by the MRI scanner at precise intervals of 2 s at the start of each volume. (c) Histogram of movie onset latencies (deviation from the respective trigger pulse) as reported by the stimulus software. This is a worst-case estimate that includes all file access latencies and indicates the complete latency until the underlying movie presentation engine reports the start of a movie segment back to the stimulus software. (d) Histogram of deviations of movie segment duration from target duration. All histograms are normalized and aggregate information across all participants.