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faq:triggers [2017/09/20 17:54]
robert created
faq:triggers [2017/09/21 10:08] (current)
130.229.13.128 [Elekta Neuromag]
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 ==== Elekta Neuromag ==== ==== Elekta Neuromag ====
  
-The trigger coding in the Elekta Neuromag system is more complex than in most systems ​and one physical event is coded in multiple trigger channels in the fif file and hence also in multiple FieldTrip events. There are STI101 and STI102 channels, which represent combined values, i.e. that are usually between 1 and 255. There are also STI00x with x running from 1 to 8, which represent the individual bits of the combined value. The STI00x channels are expressed in Volt and contain [[https://​en.wikipedia.org/​wiki/​Transistor–transistor_logic|TTL]] level voltages. ​+The trigger coding in the Elekta Neuromag system is more complex than in most systems. One physical event gets coded in multiple trigger channels in the fif file and hence also in multiple FieldTrip events. There are STI101 and STI102 channels, which represent combined values; these are usually between 1 and 255. There are also STI00x with x running from 1 to 8, which represent the individual bits of the combined value. The STI00x channels are expressed in Volt and contain [[https://​en.wikipedia.org/​wiki/​Transistor–transistor_logic|TTL]] level voltages.
  
-The following code finds the corresponding ​bits in the STI00x channels ​and aligns them with the combined value in a table. ​+The following code finds all unique events and aligns ​the individual ​bits in the STI00x channels with the combined value in a table. ​
  
 <​code>​ <​code>​
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 </​code>​ </​code>​
  
-The table can easily be exported to Excel, where you can do additional checks on the columns. ​+The table can easily be exported to Excel or LibreOffice, where you can do additional checks on the columns. ​
  
 {{:​faq:​screen_shot_2017-09-20_at_17.50.22.png?​600|}} {{:​faq:​screen_shot_2017-09-20_at_17.50.22.png?​600|}}
 +
 +The STI101 channel represents stimuli, in STI102 you can see the response codes corresponding to button presses.
 +
 +Note that the event type "​Trigger"​ replicates the event type "​STI101"​. We recommend that you use STI101 for consistency with Elekta and MNE software.
 +