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faq:triggers [2017/09/21 10:08] 130.229.13.128 [Elekta Neuromag] |
faq:triggers [2018/10/21 14:56] 42.49.180.224 [How can I check or decipher the sequence of triggers in my data?] |
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| ===== How can I check or decipher the sequence of triggers in my data? ===== | ===== How can I check or decipher the sequence of triggers in my data? ===== | ||
| - | Triggers, stimuli, responses, annotations, etcetera in the recording are in FieldTrip jointly represented as "events" and read from the dataset using **[[:reference:ft_read_event]]**. The following code demonstrates how you can do a visual check of the triggers and export them to an excel file. | + | Triggers, stimuli, responses, annotations, etcetera in the recording are in FieldTrip jointly represented as "events" and read from the dataset using **[[:reference:ft_read_event]]**. The following code demonstrates how you can do a visual check of the triggers and export them to an excel file. |
| We start by reading the header (which we need for the sampling frequency) and the events. In case of NeuroMag *.fif data that was recorded with internal active shielding (IAS) and that has not been maxfiltered yet, you can disable the check for maxfilter. | We start by reading the header (which we need for the sampling frequency) and the events. In case of NeuroMag *.fif data that was recorded with internal active shielding (IAS) and that has not been maxfiltered yet, you can disable the check for maxfilter. | ||
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| event = ft_read_event(dataset, 'checkmaxfilter', 'no'); | event = ft_read_event(dataset, 'checkmaxfilter', 'no'); | ||
| - | The "event" variable is a structure array, in which each element represent one event. | + | The "event" variable is a structure array, in which each element represent one event. |
| - | >> event | + | >> event |
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| event = | event = | ||
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| The visual inspection of the figure shows you the overall structure of the events in the recording. Often it allows you to decipher part of the experimental design. | The visual inspection of the figure shows you the overall structure of the events in the recording. Often it allows you to decipher part of the experimental design. | ||
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| ==== Elekta Neuromag ==== | ==== Elekta Neuromag ==== | ||
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| Note that the event type "Trigger" replicates the event type "STI101". We recommend that you use STI101 for consistency with Elekta and MNE software. | Note that the event type "Trigger" replicates the event type "STI101". We recommend that you use STI101 for consistency with Elekta and MNE software. | ||
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130.229.13.128
