{
  "name": "Published visual-response reference data",
  "version": "1.0",
  "reviewed": "2026-09-19",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "provenance": {
    "kind": "transcription_of_published_aggregate_research",
    "original_article_licence": "Creative Commons Attribution licence (CC BY)",
    "citation": "Woods DL, Wyma JM, Yund EW, Herron TJ and Reed B (2015). Factors influencing the latency of simple reaction time. Frontiers in Human Neuroscience, 9:131. doi:10.3389/fnhum.2015.00131",
    "doi": "10.3389/fnhum.2015.00131",
    "source_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC4374455/",
    "transcribed_by": "AimTests",
    "changes": "Selected aggregate fields, labeled columns and CSV/JSON formatting; experiment means rounded as stated.",
    "contains_aimtests_user_data": false
  },
  "scope": "Simple visual responses with a mouse in two research experiments. No participant-level records or population percentiles.",
  "benchmarks": {
    "columns": {
      "experiment": "Experiment identifier in Woods et al. (2015).",
      "participants": "Participant count, not trial count.",
      "minimum_age_years": "Minimum participant age in years.",
      "maximum_age_years": "Maximum participant age in years.",
      "practice_trials": "Practice trials per participant before the measured trials.",
      "measured_trials": "Measured trials per participant.",
      "recorded_mean_ms_rounded": "Recorded mean in ms, rounded to a whole millisecond.",
      "corrected_mean_ms_rounded": "Mean in ms after the study's hardware correction, rounded to a whole millisecond."
    },
    "rows": [
      {
        "experiment": 1,
        "participants": 1469,
        "minimum_age_years": 18,
        "maximum_age_years": 65,
        "practice_trials": 20,
        "measured_trials": 120,
        "recorded_mean_ms_rounded": 231,
        "corrected_mean_ms_rounded": 213
      },
      {
        "experiment": 2,
        "participants": 189,
        "minimum_age_years": 18,
        "maximum_age_years": 82,
        "practice_trials": 20,
        "measured_trials": 100,
        "recorded_mean_ms_rounded": 238,
        "corrected_mean_ms_rounded": 220
      }
    ]
  },
  "age_groups": {
    "experiment": 1,
    "source_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC4374455/table/T2/",
    "columns": {
      "group": "Group identifier; all seven groups belong to experiment 1.",
      "mean_age_years": "Group mean age in years, not an individual age or an age-range boundary.",
      "participants": "Participant count in this group.",
      "recorded_mean_ms": "Group mean in ms before hardware correction, one decimal place.",
      "between_person_sd_ms": "Between-person standard deviation of mean scores in ms, not measurement error or a personal interval."
    },
    "rows": [
      {
        "group": 1,
        "mean_age_years": 20.8,
        "participants": 86,
        "recorded_mean_ms": 217.9,
        "between_person_sd_ms": 19.5
      },
      {
        "group": 2,
        "mean_age_years": 28.6,
        "participants": 115,
        "recorded_mean_ms": 221.0,
        "between_person_sd_ms": 22.8
      },
      {
        "group": 3,
        "mean_age_years": 35.5,
        "participants": 201,
        "recorded_mean_ms": 224.8,
        "between_person_sd_ms": 23.4
      },
      {
        "group": 4,
        "mean_age_years": 42.3,
        "participants": 273,
        "recorded_mean_ms": 227.7,
        "between_person_sd_ms": 26.6
      },
      {
        "group": 5,
        "mean_age_years": 48.6,
        "participants": 276,
        "recorded_mean_ms": 233.6,
        "between_person_sd_ms": 27.2
      },
      {
        "group": 6,
        "mean_age_years": 55.0,
        "participants": 272,
        "recorded_mean_ms": 236.4,
        "between_person_sd_ms": 27.0
      },
      {
        "group": 7,
        "mean_age_years": 61.6,
        "participants": 246,
        "recorded_mean_ms": 239.1,
        "between_person_sd_ms": 28.1
      }
    ]
  },
  "limitations": [
    "Hardware-corrected means apply to the researchers' equipment, not the reader's device.",
    "Age-group results describe adults aged 18-65 in experiment 1 and do not supply norms for children.",
    "Age-group standard deviations describe variation between participants, not a device-delay allowance."
  ]
}