diff --git a/src/modality-specific-files/motion.md b/src/modality-specific-files/motion.md index 38ff4449cd..6ca4c81dfb 100644 --- a/src/modality-specific-files/motion.md +++ b/src/modality-specific-files/motion.md @@ -58,10 +58,10 @@ When multiple tracking systems are used to record motion or motion capture is us it is advised to provide a possibility to synchronize recordings. The preferred way to do so is to use the acquisition time of the first data point of recordings and to store this information in the `acq_time` column of the [`*_scans.tsv`](../modality-agnostic-files.md#scans-file) file. -The Note that the [BIDS date time format](../common-principles.md#units) allows optional fractional seconds, which SHOULD be used to maximize the precision of the synchronization. +Note that the [BIDS date time format](../common-principles.md#units) allows optional fractional seconds, which SHOULD be used to maximize the precision of the synchronization. Only if the precision of the synchronization is not high enough, the `*_events.tsv` file SHOULD be used to synchronize recordings. In this file, the start- and stop time of the recording of a system are specified in relation to a system to synchronize with. -If more than two systems are to be synchronized, it is up to the user to indntify the "main" system. +If more than two systems are to be synchronized, it is up to the user to identify the "main" system. In case a tracking system provides time information with every recorded sample, these time information MAY be stored in form of latencies to recording onset (first sample) in the `*_motion.tsv` file.