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NIMH Data Archive
NDA ABCD CCF OAI NIAAADA AMP SCZ HEAL

N-Back Task

1,069 Shared Subjects

N/A
Clinical Assessments
Task Based
07/07/2017
nback01
10/24/2023
View Change History
01
Definition
Submission Template
Query Element Name Data Type Size Required Description Value Range Notes Aliases
subjectkey GUID Required The NDAR Global Unique Identifier (GUID) for research subject NDAR*
src_subject_id String 20 Required Subject ID how it's defined in lab/project subject
interview_age Integer Required Age in months at the time of the interview/test/sampling/imaging. 0::1440 Age is rounded to chronological month. If the research participant is 15-days-old at time of interview, the appropriate value would be 0 months. If the participant is 16-days-old, the value would be 1 month.
interview_date Date Required Date on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYY nbacksessdate
sex String 20 Required Sex of subject at birth M;F; O; NR M = Male; F = Female; O=Other; NR = Not reported gender
fnetp String 20 Recommended pre, post, follow up 6 or 12 nbacktp
experimentname String 50 Recommended NBack_Version1_updated
nbacksess Integer Recommended task session number 1::3
fneclockinfo String 1,000 Recommended detailed information on clock used by software to run task and detailed timestamp nbackclock_info
fnedatbase String 20 Recommended task data file version used nbackdatafile_basename
fnerefrate String 20 Recommended display used refresh rate as detected at start of task in Hz nbackdisplay_refreshrate
fneexpver String 20 Recommended task version used 1.0.0.17 nbackexpver
fnegroup String 20 Recommended group used nbackgroup
fnerandseed String 20 Recommended random seed used in task nbackrandseed
fneruntime String 20 Recommended run time version of software used 2.0.10.242 nbackruntimever
fnerunexpec String 20 Recommended run time version of software expected 2.0.10.242 nbackruntimeverexp
fnesessutc String 20 Recommended exact time and date stamp using utc mm/dd/yyyy hh:mm nbacksessutc
fnesesstime String 20 Recommended time session took place hh:mm:ss nbacksesstime
fnestudver String 20 Recommended e-prime studio version used to design task 2.0.10.147 nbackstudiover
nbackblock Integer Recommended block number used for task 1::16
fneblocklist Integer Recommended block list nbackblocklist
fneblockcycle Integer Recommended block list cycle nbackblocklist_cycle
nbackblocklist_sample Integer Recommended block sample number used 1::16
nbackprocedure_block String 10 Recommended name of procedure being run in this block nback0; nback1; nback2; nback3
nbackrunning_block String 20 Recommended block list being run
nbacktrial Integer Recommended trial number being run in cycle block (there are 11 trials per block cycle for a total of 176 trials) 1::11
nbackcorrectanswer String 5 Recommended correct answer expected in this trial run
SPACE ; blank
SPACE = space bar key pressed; blank = blank (no input required)
nback0fixation_acc Integer Recommended response accuracy in 0-back task fixation default to 0; -7 = N/A as task was not run in this trial
nback0fixation_cresp Integer Recommended 0-back fixation correct response -7; -8 -7 = N/A as task was not run in this trial; -8 not present
nback0fixation_resp String 10 Recommended 0-back fixation actual response {SPACE} ; blank; -7;other {SPACE} = space bar key pressed; blank = blank (no input required); -7 = N/A as task was not run in this trial; other = accidentally pressed another key
nback0fixation_rt Integer Recommended subject response time to 0-back task fixation 0::15000; -7 in milliseconds; -7 = N/A as task was not run in this cycle
nback0fixation_rttime Integer Recommended subject response timestamp in relation to beginning program execuation in milliseconds; -7 = N/A as task was not run in this cycle
nback0letter_acc Integer Recommended subject response accuracy in 0-back task 0 ; 1 ; -7 0 = incorrect response to sample ; 1 = correct respnse to sample ; -7 = N/A as task was not run in this cycle
nback0letter_cresp String 10 Recommended 0-back task expected correct response
SPACE ; blank
SPACE = space bar key pressed; blank = blank (no input required)
nback0letter_resp String 10 Recommended 0-back task actual response by subject
SPACE ; blank;other
SPACE = space bar key pressed; blank = blank (no input required); other = accidentally pressed another key
nback0letter_rt Integer Recommended subject response time to 0-back task 0::1000; -7 in milliseconds; -7 = N/A as task was not run in this cycle
nback0letter_rttime Integer Recommended subject response timestamp in 0-back task in relation to beginning program execution in milliseconds; -7 = N/A as task was not run in this cycle
nback0list Integer Recommended sample number in 0-back task list presented in run(list constains 44 samples in total) 1::44; -7 1 = first sample in the list; 2 = second sample in the list; 3 = third sample in the list; -7 = N/A as task was not run in this cycle
nback0list_cycle Integer Recommended number of cycles used in 0-back task (there are 11 samples in 1 cycle for a total of 44 samples in each run) 1; -7 1 = 1 cycle; -7 = N/A as task was not run in this cycle
nback0list_sample Integer Recommended sample number in cycle for this 0-back task run (there are 11 samples in 1 cycle for a total of 44 samples in each run) 1::44; -7 1 = first sample in the cycle; 2 = second sample in the list; 3 = third sample in the list; -7 = N/A as task was not run in this cycle
nback1fixation_acc Integer Recommended response accuracy in 1-back task fixation 0; -7 default to 0; -7 = N/A as task was not run in this cycle
nback1fixation_cresp Integer Recommended 1-back fixation correct response -7; -8 -7 = N/A as tasks was no run in this cycle; -8 not present
nback1fixation_resp String 10 Recommended 1-back fixation actual response
SPACE ; blank;other
SPACE = space bar key pressed; blank = blank (no input required); other = accidentally pressed another key
nback1fixation_rt Integer Recommended subject response time to 1-back task fixation 0::15000; -7 in milliseconds; -7 = N/A as task was not run in this cycle
nback1fixation_rttime Integer Recommended subject response timestamp in relation to beginning program execuation in milliseconds; -7 = N/A as task was not run in this cycle
nback1letter_acc Integer Recommended subject response accuracy in 1-back task 0 ; 1 ; -7 0 = incorrect response to sample ; 1 = correct respnse to sample ; -7 = N/A as task was not run in this cycle
nback1letter_cresp String 10 Recommended 1-back task expected correct response
SPACE ; blank
SPACE = space bar key pressed; blank = blank (no input required) nback1letter_cresp.
nback1letter_resp String 10 Recommended 1-back task actual response by subject
SPACE ; blank;other
SPACE = space bar key pressed; blank = blank (no input required); other = accidentally pressed another key
nback1letter_rt Integer Recommended subject response time to 1-back task 0::1000; -7 in milliseconds; -7 = N/A as task was not run in this cycle
nback1letter_rttime Integer Recommended subject response timestamp in 1-back task in relation to beginning program execution in milliseconds; -7 = N/A as task was not run in this cycle
nback1list Integer Recommended sample number in 1-back task list presented in run(list constains 44 samples in total) 1::44; -7 1 = first sample in the list; 2 = second sample in the list; 3 = third sample in the list; -7 = N/A as task was not run in this cycle
nback1list_cycle Integer Recommended number of cycles used in 1-back task (there are 11 samples in 1 cycle for a total of 44 samples in each run) 1; -7 1 = 1 cycle; -7 = N/A as task was not run in this cycle
nback1list_sample Integer Recommended sample number in cycle for this 1-back task run (there are 11 samples in 1 cycle for a total of 44 samples in each run) 1::44; -7 1 = first sample in the cycle; 2 = second sample in the list; 3 = third sample in the list; -7 = N/A as task was not run in this cycle
nback2fixation_acc Integer Recommended response accuracy in 2-back task fixation 0; -7 default to 0; -7 = N/A as task was not run in this cycle
nback2fixation_cresp Integer Recommended 2-back fixation correct response -7; -8 -7 = N/A as tasks was no run in this cycle; -8 not present
nback2fixation_resp String 10 Recommended 2-back fixation actual response
SPACE ; blank;other
SPACE = space bar key pressed; blank = blank (no input required); other = accidentally pressed another key
nback2fixation_rt Integer Recommended subject response time to 2-back task fixation 0::15000; -7 in milliseconds; -7 = N/A as task was not run in this cycle
nback2fixation_rttime Integer Recommended subject response timestamp in relation to beginning program execuation in milliseconds; -7 = N/A as task was not run in this cycle
nback2letter_acc Integer Recommended subject response accuracy in 2-back task 0 ; 1 ; -7 0 = incorrect response to sample ; 1 = correct respnse to sample ; -7 = N/A as task was not run in this cycle
nback2letter_cresp String 10 Recommended 2-back task expected correct response
SPACE ; blank
SPACE = space bar key pressed; blank = blank (no input required)
nback2letter_resp String 10 Recommended 2-back task actual response by subject
SPACE ; blank;other
SPACE = space bar key pressed; blank = blank (no input required); other = accidentally pressed another key
nback2letter_rt Integer Recommended subject response time to 2-back task 0::1000; -7 in milliseconds; -7 = N/A as task was not run in this cycle
nback2letter_rttime Integer Recommended subject response timestamp in 2-back task in relation to beginning program execution in milliseconds; -7 = N/A as task was not run in this cycle
nback2list Integer Recommended sample number in 2-back task list presented in run(list constains 44 samples in total) 1::44; -7 1 = first sample in the list; 2 = second sample in the list; 3 = third sample in the list; -7 = N/A as task was not run in this cycle
nback2list_cycle Integer Recommended number of cycles used in 2-back task (there are 11 samples in 1 cycle for a total of 44 samples in each run) 1; -7 1 = 1 cycle; -7 = N/A as task was not run in this cycle
nback2list_sample Integer Recommended sample number in cycle for this 2-back task run (there are 11 samples in 1 cycle for a total of 44 samples in each run) 1::44; -7 1 = first sample in the cycle; 2 = second sample in the list; 3 = third sample in the list; -7 = N/A as task was not run in this cycle
nback3fixation_acc Integer Recommended response accuracy in 3-back task fixation 0; -7 nbacklist0; nbacklist1; nbacklist2; nbacklist3
nback3fixation_cresp Integer Recommended 3-back fixation correct response -7; -8 -7 = N/A as tasks was no run in this cycle; -8 not present
nback3fixation_resp String 10 Recommended 3-back fixation actual response
SPACE ; blank;other
SPACE = space bar key pressed; blank = blank (no input required); other = accidentally pressed another key
nback3fixation_rt Integer Recommended subject response time to 3-back task fixation 0::15000; -7 in milliseconds; -7 = N/A as task was not run in this cycle
nback3fixation_rttime Integer Recommended subject response timestamp in relation to beginning program execuation in milliseconds; -7 = N/A as task was not run in this cycle
nback3letter_acc Integer Recommended subject response accuracy in 3-back task 0 ; 1 ; -7 0 = incorrect response to sample ; 1 = correct respnse to sample ; -7 = N/A as task was not run in this cycle
nback3letter_cresp String 10 Recommended 3-back task expected correct response
SPACE ; blank
SPACE = space bar key pressed; blank = blank (no input required)
nback3letter_resp String 5 Recommended 3-back task actual response by subject
SPACE ; blank;other
SPACE = space bar key pressed; blank = blank (no input required); other = accidentally pressed another key
nback3letter_rt Integer Recommended subject response time to 3-back task 0::1000; -7 in milliseconds; -7 = N/A as task was not run in this cycle
nback3letter_rttime Integer Recommended subject response timestamp in 3- back task in relation to beginning program execution in milliseconds; -7 = N/A as task was not run in this cycle nback3letter_rttime.
nback3list Integer Recommended sample number in 3-back task list presented in run(list constains 44 samples in total) 1::44; -7 1 = first sample in the list; 2 = second sample in the list; 3 = third sample in the list; -7 = N/A as task was not run in this cycle
nback3list_cycle Integer Recommended number of cycles used in 3-back task (there are 11 samples in 1 cycle block for a total of 44 samples in each run) 1; -7 1 = 1 cycle; -7 = N/A as task was not run in this cycle
nback3list_sample Integer Recommended sample number in cycle for this 3-back task run (there are 11 samples in 1 cycle for a total of 44 samples in each procedure block) 1::44; -7 1 = first sample in the cycle; 2 = second sample in the list; 3 = third sample in the list; -7 = N/A as task was not run in this cycle
nackprocedure_trial String 10 Recommended name of procedure trial list nbacklist0; nbacklist1; nbacklist2; nbacklist3
nackrunning_trial String 10 Recommended name of running trial list nbacklist0; nbacklist1; nbacklist2; nbacklist3
nackstimulus String 1 Recommended stimulus: letter presented A::Z
nbackdms_mrto Float Recommended Nback Delayed Match to Sample - Median Response Time Overall Median time between a probe and participant corresponding response across trials (ms)
nbackdms_pcmc1 Float Recommended Nback Delayed Match to Sample - Proportion Correct - Match - Condition 1 Proportion of correct trials, in which the current probe is a match to the target, during the 1-back condition
nbackdms_pcrnc1 Float Recommended Nback Delayed Match to Sample - Proportion Correct - Recent Negative - Condition 1 Proportion of correct trials, during the 1-back condition, among those trials in which the current probe matches a recently presented non-target (i.e., matches a simulus in the 2-back position)
nbackdms_pcnrnc1 Float Recommended Nback Delayed Match to Sample - Proportion Correct - NonRecent Negative - Condition 1 Proportion of correct trials, during the 1-back condition, among those trials in which the current probe does not match a recently presented non-target (i.e., does not match a stimulus that had been presented in the current 2-back position)
nbackdms_pcmc2 Float Recommended Nback Delayed Match to Sample - Proportion Correct - Match - Condition 2 Proportion of correct trials, in which the current probe is a match to the target, during the 2-back condition
nbackdms_pcrnc2 Float Recommended Nback Delayed Match to Sample - Proportion Correct - Recent Negative - Condition 2 Proportion of correct trials, during the 2-back condition, among those trials in which the current probe matches a recently presented non-target (i.e., matches a simulus in either the current 1-back or the current 3-back position)
nbackdms_pcnrnc2 Float Recommended Nback Delayed Match to Sample - Proportion Correct - NonRecent Negative - Condition 2 Proportion of correct trials, during the 2-back condition, among those trials in which the current probe does not match a recently presented non-target (i.e., does not match a stimulus that had been presented in either the current 1-back or the current 3-back position)
nbackdms_pco Float Recommended Nback Delayed Match to Sample - Proportion Correct Overall Proportion of correct trials
nback_d0 Float Recommended d score for 0-back task
nback_d1 Float Recommended d score for 1-back task
nback_d2 Float Recommended d score for 2-back task
nback_d3 Float Recommended d score for 3-back task
nback_d Float Recommended overall score for n-back task
nback_data_complete Integer Recommended Complete? 0::2 0 = Incomplete; 1 = Unverified; 2 = Complete
visit_year Integer Recommended Year of visit
n0backacc Float Recommended Percent accuracy for 0-back
n1backacc Float Recommended Percent accuracy for 1-back
n2backacc Float Recommended Percent accuracy for 2-back
meanrt_2back Float Recommended Average reaction time for all correct 2 back trials (ms)
medrt_1back Float Recommended Median reaction time for all correct 1 back trials (ms)
medrt_2back Float Recommended Median reaction time for all correct 2 back trials (ms)
hit_1back Integer Recommended Number of correct 1 back trials 0::13
hit_2back Integer Recommended Number of correct 2 back trials 0::13
percent_1back Float Recommended The percentage of correct 1 back trials 0::1 0 = 0% :: 1 = 100%
percent_2back Float Recommended The percentage of correct 2 back trials 0::1 0 = 0% :: 1 = 100%
false_alarm_1back Integer Recommended Number of incorrect 1 back trial 0::13
false_alarm_2back Integer Recommended Number of incorrect 2 back trials 0::13
meanrt_1back Float Recommended Average reaction time for all correct 1 back trials (ms)
Data Structure

This page displays the data structure defined for the measure identified in the title and structure short name. The table below displays a list of data elements in this structure (also called variables) and the following information:

  • Element Name: This is the standard element name
  • Data Type: Which type of data this element is, e.g. String, Float, File location.
  • Size: If applicable, the character limit of this element
  • Required: This column displays whether the element is Required for valid submissions, Recommended for valid submissions, Conditional on other elements, or Optional
  • Description: A basic description
  • Value Range: Which values can appear validly in this element (case sensitive for strings)
  • Notes: Expanded description or notes on coding of values
  • Aliases: A list of currently supported Aliases (alternate element names)
  • For valid elements with shared data, on the far left is a Filter button you can use to view a summary of shared data for that element and apply a query filter to your Cart based on selected value ranges

At the top of this page you can also:

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