{
  "trial_type": {
    "LongName": "Event category",
    "Description": "Semantic event category used for analysis."
  },
  "event_type": {
    "Description": "Whether the marker denotes a block, stimulus, or technical timing event."
  },
  "source_marker": {
    "Description": "Original short marker code retained from the synchronised LSL event stream."
  },
  "condition": {
    "Description": "Recording-level experimental condition."
  },
  "relative_level_db": {
    "Description": "Stimulus level in dB relative to the participant-specific pure-tone hearing threshold; n/a for rest."
  },
  "block_type": {
    "Description": "Active frequent-rare block: A maps s1 to frequent; B maps s2 to frequent."
  },
  "block_index": {
    "Description": "Sequential block number."
  },
  "stimulus": {
    "Description": "Tone marker presented within the active block."
  },
  "stimulus_index": {
    "Description": "Sequential stimulus number within the active block."
  }
}