Heart rate variability in a binary choice reaction task: an evaluation of some scoring methods

Several scoring methods of heart rate variability have been investigated in a binary choice task. It was concluded that in this type of task the number of waves in the cardiotachogram and the sum of absolute differences between successive R-R intervals divided by the number of waves are the best indicators of the task levels (20, 30, 40, 50 and 60 binary choices per min). A detailed analysis of these scoring methods in different types of information processing tasks is recommended.