Mouse vs keyboard and using the 0 (zero) key?

[jarvis24]

0 would be used to select a 10th option. There isn’t actually a zero key as far as MediaLab knows. Since you can use the F1-F12 keys, some people label those with stickers to indicate the repsonse values e.g., 0-5, -3 to +3, etc.

See also the section on data in the guide--it talks about this and how you can have the values automatically recoded if you like. Note that the data stored by default are the buttons they press, not the labels that appears on screen. e.g., If the first button was labelled -3 (there is obviously no -3 key!), the data would indicate that they pressed the "1" key.