The Normalized Reaction Time Active Task is based on the ResearchKit Reaction Time test. Instead of shaking the device in response to the stimulus, however, the participant simply lifts their finger and taps the stimulus when it appears.
When your project uses the CSV export format for Survey Results, data for Active Tasks is exported in the file SurveyNormalizedReactionTimeResults.csv. When your project uses the JSON export format, Active Task data is included in the file SurveyResults.json.
For a typical survey using this task, you'll expect to see:
- One survey result each time the participant completes the survey.
- One step result representing the Active Task.
- One NRT result for each attempt in that step. The individual prompts and responses are captured within that result.
There are several timestamps within the Normalized Reaction Time task, illustrated by the diagram below.
Data Fields
Sample CSV Export
SurveyNormalizedReactionTimeResultKey,SurveyStepResultKey,SurveyResultKey,ParticipantIdentifier,ReactionDate,StimulusStartDate,TimerStartDate,TimerEndDate,CurrentInterval,StartDate,EndDate
1111-22222-33333,aaaa-bbbbb-ccccc,dddd-eeee-ffff,TestID54,296514.00222925004,296513.57842845836,296513.83621108334,296514.002296875,2,2021-01-13T11:15:17-05:00,2021-01-13T11:15:17-05:00
4444-55555-66666,aaaa-bbbbb-ccccc,dddd-eeee-ffff,TestID54,0,0,0,296546.42473716667,6,2021-01-13T11:15:49-05:00,2021-01-13T11:15:49-05:00
Sample JSON Export
Note that since the JSON export is included in the SurveyResults.json file, some of the reference keys either do not apply, or are part of the overall survey step data.
{
"ReactionDate": 368686.43705948605,
"StimulusStartDate": 368685.414478047,
"TimerEndDate": 368686.437065418,
"TimerStartDate": 368685.762244465,
"Type": "NormalizedReactionTimeResult",
"EndDate": "2020-01-03T15:29:13-0600",
"StartDate": "2020-01-03T15:29:13-0600",
"Identifier": "REACTION_TIME_TEST",
"CurrentInterval": 4
},
{
"ReactionDate": 0,
"StimulusStartDate": 368695.362009235,
"TimerEndDate": 368698.362137118,
"TimerStartDate": 0,
"Type": "NormalizedReactionTimeResult",
"EndDate": "2020-01-03T15:29:25-0600",
"StartDate": "2020-01-03T15:29:25-0600",
"Identifier": "REACTION_TIME_TEST",
"CurrentInterval": 2
}