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Frequently Asked Questions


NDA Help Center

Filter Cart

The Filter Cart provides a powerful way to query and access data for which you may be interested.  

A few points related to the filter cart are important to understand with the NDA Query/Filter implementation: 

First, the filter cart is populated asyncronously.  So, when you run a query, it may take a moment to populate but this will happen in the background so you can define other queries during this time.  

When you are adding your first filter, all data associated with your query will be added to the filter cart (whether it be a collection, a concept, a study, a data structure/elment or subjects). Not all data structures or collections will necessarily be displayed.  For example, if you select the NDA imaging structure image03, and further restrict that query to scan_type fMRI, only fMRI images will appear and only the image03 structure will be shown.  To see other data structures, select "Find All Subject Data" which will query all data for those subjects. When a secord or third filter is applied, an AND condition is used.  A subject must exist in all filters.  If the subject does not appear in any one filter, that subjects data will not be included in your filter cart. If that happens, clear your filter cart, and start over.  

It is best to package more data than you need and access those data using other tools, independent of the NDA (e.g. miNDAR snapshot), to limit the data selected.  If you have any questions on data access, are interested in using avaialble web services, or need help accessing data, please contact us for assistance.  

Frequently Asked Questions



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Heartbeat Distractor Task



Download Definition as
Download Submission Template as
Element NameData TypeSizeRequiredDescriptionValue RangeNotesAliases
subjectkeyGUIDRequiredThe NDAR Global Unique Identifier (GUID) for research subjectNDAR*
src_subject_idString20RequiredSubject ID how it's defined in lab/project
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYYRequired field
interview_ageIntegerRequiredAge in months at the time of the interview/test/sampling/imaging.0 :: 1260Age 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.
sexString20RequiredSex of the subjectM;FM = Male; F = Femalegender
handednessString29RequiredhandednessR;L;B;999R = Right; L = Left; B = Both
block1_distractorIntegerRecommendedblock1 distractor0::20=none; 1=low; 2=high
b1_trial1_timeIntegerRecommendedBlock 1 trial1 time25;35;45;100
b1_trial1_countedbeatsIntegerRecommendedBlock 1 trial1 counted beats
b1_trial1_actualbeatsIntegerRecommendedBlock 1 trial1 actual beats
b1_trial2_timeIntegerRecommendedBlock 1 trial2 time25;35;45;100
b1_trial2_countedbeatsIntegerRecommendedBlock 1 trial2 counted beats
b1_trial2_actualbeatsIntegerRecommendedBlock 1 trial2 actual beats
b1_trial3_timeIntegerRecommendedBlock 1 trial3 time25;35;45;100
b1_trial3_countedbeatsIntegerRecommendedBlock 1 trial3 counted beats
b1_trial3_actualbeatsIntegerRecommendedBlock 1 trial3 actual beats
b1_trial4_timeIntegerRecommendedBlock 1 trial4 time25;35;45;100
b1_trial4_countedbeatsIntegerRecommendedBlock 1 trial4 counted beats
b1_trial4_actualbeatsIntegerRecommendedBlock 1 trial4 actual beats
block2_distractorIntegerRecommendedblock2 distractor0::20=none; 1=low; 2=high
b2_trial1_timeIntegerRecommendedBlock 2 trial1 time25;35;45;100
b2_trial1_countedbeatsIntegerRecommendedBlock 2 trial1 counted beats
b2_trial1_actualbeatsIntegerRecommendedBlock 2 trial1 actual beats
b2_trial2_timeIntegerRecommendedBlock 2 trial2 time25;35;45;100
b2_trial2_countedbeatsIntegerRecommendedBlock 2 trial2 counted beats
b2_trial2_actualbeatsIntegerRecommendedBlock 2 trial2 actual beats
b2_trial3_timeIntegerRecommendedBlock 2 trial3 time25;35;45;100
b2_trial3_countedbeatsIntegerRecommendedBlock 2 trial3 counted beats
b2_trial3_actualbeatsIntegerRecommendedBlock 2 trial3 actual beats
b2_trial4_timeIntegerRecommendedBlock 2 trial4 time25;35;45;100
b2_trial4_countedbeatsIntegerRecommendedBlock 2 trial4 counted beats
b2_trial4_actualbeatsIntegerRecommendedBlock 2 trial4 actual beats
debrief_q1IntegerRecommendedWas the participant able to feel their heartbeat with the pulse oximeter?0;10=No;1=Yes
debrief_q2IntegerRecommendedHow hard was the task?1::101 = easiest; 10 = hardest
debrief_q3IntegerRecommendedHow confident did you feel?1::101 = not confident; 10 = very confident
debrief_q4String50RecommendedWhat method were you using to count your heartbeat?
debrief_q5IntegerRecommendedDo you notice your heart beating on a regular basis?0;10=No;1=Yes
viscount_trial1_timeIntegerRecommendedviscount trial1 time25;35;45;100
viscount_trial1_countsIntegerRecommendedviscount trial1 counts
viscount_trial2_timeIntegerRecommendedviscount trial2 time25;35;45;100
viscount_trial2_countsIntegerRecommendedviscount trial2 counts
viscount_trial3_timeIntegerRecommendedviscount trial3 time25;35;45;100
viscount_trial3_countsIntegerRecommendedviscount trial3 counts
viscount_trial4_timeIntegerRecommendedviscount trial4 time25;35;45;100
viscount_trial4_countsIntegerRecommendedviscount trial4 counts
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:

  • Use the search bar to filter the elements displayed. This will not filter on the Size of Required columns
  • Download a copy of this definition in CSV format
  • Download a blank CSV submission template prepopulated with the correct structure header rows ready to fill with subject records and upload

Please email the The NDA Help Desk with any questions.

Distribution for DataStructure: hrtdis_task01 and Element:
Chart Help

Filters enable researchers to view the data shared in NDA before applying for access or for selecting specific data for download or NDA Study assignment. For those with access to NDA shared data, you may select specific values to be included by selecting an individual bar chart item or by selecting a range of values (e.g. interview_age) using the "Add Range" button. Note that not all elements have appropriately distinct values like comments and subjectkey and are not available for filtering. Additionally, item level detail is not always provided by the research community as indicated by the number of null values given.

Filters for multiple data elements within a structure are supported. Selections across multiple data structures will be supported in a future version of NDA.