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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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NDA provides a single access to de-identified autism research data. For permission to download data, you will need an NDA account with approved access to NDA or a connected repository (AGRE, IAN, or the ATP). For NDA access, you need to be a research investigator sponsored by an NIH recognized institution with federal wide assurance. See Request Access for more information.

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Data Structures with shared data
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Hand Holding 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/projectpid
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYYRequired fieldassessment_date
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
rater_titleString50RecommendedRater's Titleenterer
aescodeIntegerRecommendedStaff code number of person completing this formra
comments_miscString4,000RecommendedMiscellaneous comments on study, interview, methodology relevant to this form datascan_notes
operatorIntegerRecommendedScanner Operator ID
tasks_videorecordedIntegerRecommendedTasks Video Recorded0;1;-9991 = Completed; 0 = Not completed; -999 = Missing
conversation_taskIntegerRecommendedConversation Task0;1;-9991 = Completed; 0 = Not completed; -999 = Missing
fingertip_taskIntegerRecommendedFinger Tip Synchrony Task0;1;-9991 = Completed; 0 = Not completed; -999 = Missing
teambuilding_taskIntegerRecommendedTeam Building Task0;1;-9991 = Completed; 0 = Not completed; -999 = Missing
shared_prizesIntegerRecommendedParticipant shared prizes?0;1;-9990 = No ; 1 = Yes ; -999 = Missing
break_substanceuseIntegerRecommendedDid participant smoke/drink caffeine/take medications during the break?0;1;-9990 = "No" ; 1 = "Yes"; -999 = Missing
break_substanceuse_detailsString100RecommendedIf participant chose to smoke/drink caffeine/take medications during the break, then note details
hh_orderString6RecommendedHand Holding Task Experiment Order
fingersIntegerRecommendedFingers L/R0;1;-9990 = Left ; 1 = Right ; -999 = Missing
neutralFloatRecommendedNeutral Shock Level-999 = Missing
unpleasantFloatRecommendedUnpleasant Shock Level-999 = Missing
hh_localizerIntegerRecommendedHand-Holding Localizer Preparations0;1;-9991 = No Issues; 0 = Not completed; -999 = Missing
hh_biasbcIntegerRecommendedHand-Holding Bias_BC Preparations0;1;-9991 = No Issues; 0 = Not completed; -999 = Missing
hh_biaschIntegerRecommendedHand-Holding Bias_32CH Preparations0;1;-9991 = No Issues; 0 = Not completed; -999 = Missing
t1IntegerRecommendedHand-Holding T1 Preparations0;1;-9991 = No Issues; 0 = Not completed; -999 = Missing
hh_fourvol1IntegerRecommendedHand-Holding 4 Volume Echo-planar imaging Scan 1 Preparations0;1;-9991 = No Issues; 0 = Not completed; -999 = Missing
hh_fourvol2IntegerRecommendedHand-Holding 4 Volume Echo-planar imaging Scan 2 Preparations0;1;-9991 = No Issues; 0 = Not completed; -999 = Missing
hh_instructionsString100RecommendedHand Holding Task Instructions
hhrun1String500RecommendedHand Holding Task Run 1 (Notes)hhrun, hhrun2, hhrun3, hhrun4, hhrun5, hhrun6
hhrun1_valenceIntegerRecommendedSelf-Assessment Manikin Valence: "How unpleasant or pleasant do you feel?1::5; -9991 = Extremely Unpleasant ; 3 = Neutral ; 5 = Extremely Pleasant; -999=Missinghhrun2_valence, hhrun3_valence, hhrun4_valence, hhrun5_valence, hhrun6_valence, hhrun_valence
hhrun1_arousalIntegerRecommendedSelf-Assessment Manikin Arousal: "How calm or agitated do you feel?1::5; -9991 = Extremely Calm ; 3 = Somewhat Agitated ; 5 = Extremely Agitated ; -999 = Missinghhrun2_arousal, hhrun3_arousal, hhrun4_arousal, hhrun5_arousal, hhrun6_arousal, hhrun_arousal
hhrun1_shockchangedIntegerRecommendedShock Level Changed?0;1;-9990 = No ; 1 = Yes ; -999 = Missinghhrun2_shockchanged, hhrun3_shockchanged, hhrun4_shockchanged, hhrun5_shockchanged, hhrun_shockchanged
neutral_new1FloatRecommendedNew Neutral Shock Level-999 = Missingneutral_new, neutral_new2, neutral_new3, neutral_new4, neutral_new5
unpleasant_new1FloatRecommendedNew Unpleasant Shock Level-999 = Missingunpleasant_new, unpleasant_new2, unpleasant_new3, unpleasant_new4, unpleasant_new5
hh_spinechoapIntegerRecommendedSpin Echo Anterior to Posterior0;1;-9991 = No Issues; 0 = Not completed; -999 = Missing
hh_spinechopaIntegerRecommendedSpin Echo Posterior to Anterior0;1;-9991 = No Issues; 0 = Not completed; -999 = Missing
commentString500RecommendedMiscellaneous comments about assessmenthh_notes
version_formString100RecommendedForm used/assessment name
confederateIntegerRecommendedAffiliative Confederate ID - act's as participant's partner during visit to build affiliation by completing tasks together.
saps_ad10IntegerRecommendedRater numbervisitra
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: handhold01 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.