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Dear Colin, Thank you for your reply, which is really helpful. With regard to the use of dummy event, I still have a few questions: 1. I can create a dummy event of error responses for every subject, where 1 indicates error trials and 0 indicates correct trials. For subjects without error responses, the event would be an all-zero vector. Do I understand correctly? 2. Should I also use dummy variables for other events (e.g., reward anticipation in this case)? Best, Vincent