Full list of key map codes

[mkrishnaswamy]

For my study, I am looking to use the arrow keys, among others. I was wondering if there is a full list of key names for the key map, so that we can correctly enter the options while building responses? The experiments use letters, which are called by their symbol in caps ("A", "N", etc.)
I tried, the following, which did not work since the description of the keys was inaccurate:

Code:

{
  "type": "choice",
  "choices": [
    "%s:den1_text",
    "%s:alv1_text",
    "%s:ret1_text"
  ],
  "target": [
    "%s:den1_text"
  ],
  "locations": "fixed",
  "key_mapping": [
    "UP",
    "LEFT",
    "RIGHT"
  ],
  "key_only": true,
  "instruction": "Press the corresponding key to record your answer:",
  "font_size": "40px"
}

Thanks in advance!