NDA Help Center

Login Dialog

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



Reset Password

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.

Warning Notice

This is a U.S. Government computer system, which may be accessed and used only for authorized Government business by authorized personnel. Unauthorized access or use of this computer system may subject violators to criminal, civil, and/or administrative action. All information on this computer system may be intercepted, recorded, read, copied, and disclosed by and to authorized personnel for official purposes, including criminal investigations. Such information includes sensitive data encrypted to comply with confidentiality and privacy requirements. Access or use of this computer system by any person, whether authorized or unauthorized, constitutes consent to these terms. There is no right of privacy in this system.

Update Password

You have logged in with a temporary password. Please update your password. Passwords must contain 8 or more characters and must contain at least 3 of the following types of characters:

  • Uppercase
  • Lowercase
  • Numbers
  • Special Characters limited to: %,_,!,@,#,$,-,%,&,+,=,),(,*,^,:,;

Subscribe to our mailing list

Mailing List(s)
Email Format

You are now leaving the NIMH Data Archive (NDA) web site to go to:

Click on the address above if the page does not change within 10 seconds.


NDA is not responsible for the content of this external site and does not monitor other web sites for accuracy.

Accept Terms
Filter Cart
No filters selected
Value Range
Data Structures with shared data
No filters have been selected
Switch User

EEG Phenotype Event Form



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 fieldeeg_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.partic_age
sexString20RequiredSex of the subjectM;FM = Male; F = Femalegender, partic_gender
subject_descriptionString4,000RecommendedSubject related information (e.g the affection, phenotype, disease information, etc.).
siteString101RecommendedSiteStudy Sitesite_eeg
weekFloatRecommendedWeek in level/study99=week 10-week 14
beh_12IntegerRecommendedEEG completion of Choice Reaction Time Task Y/N0;10=No; 1=Yes
beh_13IntegerRecommendedEEG completion of Probabilistic Reward Task Y/N0;10=No; 1=Yes
beh_14FloatRecommendedEEG 85th percentile number
beh_a_not_bIntegerRecommendedEEG completion of "A" not "B" Task Y/N0;10=No; 1=Yes
beh_flankerIntegerRecommendedEEG completion of Flanker Task Y/N0;10=No; 1=Yes
beh_scan_completeIntegerRecommendedphenotype session completed Y/N0;10=No; 1=Yes
beh_text_fieldString1,000RecommendedEEG notes section for BEH
beh_word_fluencyString50RecommendedEEG completion of Word Fluency Y/N
choice_4IntegerRecommendedEEG Choice Reaction Time No of practice trials
eeg_10String25RecommendedResting EEG run Time 1
eeg_108String1,000RecommendedResting EEG run 1 Comments
eeg_109String500RecommendedResting EEG run 2 Comments
eeg_11String25RecommendedResting EEG run Time 2
eeg_110String500RecommendedResting EEG run 3 Comments
eeg_111String500RecommendedResting EEG run 4 Comments
eeg_112String25RecommendedLDAEP run Time 1
eeg_113String25RecommendedLDAEP run Time 2
eeg_114String25RecommendedLDAEP run Time 3
eeg_115String25RecommendedLDAEP run Time 5
eeg_116String500RecommendedLDAEP run 1 Comments
eeg_117String500RecommendedLDAEP run 2 Comments
eeg_118String500RecommendedLDAEP run 3 Comments
eeg_119String500RecommendedLDAEP run 4 Comments
eeg_12String25RecommendedResting EEG Time 3
eeg_120String500RecommendedLDAEP run 5 Comments
eeg_121String25RecommendedLDAEP run Time 4
eeg_13String25RecommendedResting EEG run Time 4
eeg015String50RecommendedCap Size: (PM, PL, AS, AM, AL, AXL)eeg_cap_size
eeg_data_tran_dateDateRecommendedDate of EEG data transfer
eeg_ear_earFloatRecommendedEEG Ear-Ear
eeg_exp_initialsIntegerRecommendedEEG Examiner Initials
eeg_fagerIntegerRecommendedEEG Completed Fagerstrom Y/N0;10=No; 1=Yes
eeg_head_circumFloatRecommendedEEG head Circumference
eeg_mri_completeIntegerRecommendedeeg/mri same day order
eeg_nasionFloatRecommendedEEG Nasion-lnion
eeg_scan_completeIntegerRecommendedEEG completed session Y/N0;10=No; 1=Yes
eeg_speilbergerIntegerRecommendedEEG Completed SSAS Y/N0;10=No; 1=Yes
eeg_vams_checkIntegerRecommendedEEG Completed five VAMS Y/N0;10=No; 1=Yes
partici_questionsIntegerRecommendedEEG Completed participant questionaire Y/N0;10=No; 1=Yes
pheno_data_tran_dateDateRecommendedDate of BehPheno data transfer
qids_eeg_totalFloatRecommendedQIDS EEG Total Scoreqids_eeg_score
sample_group_eegIntegerRecommendedSample group selection
target_washout_eegDateRecommendedTarget washout date
wfss_10IntegerRecommendedEEG Number of repeat errors
wfss_11IntegerRecommendedEEG Total number of proper noun errors
wfss_7IntegerRecommendedEEG Word Fluency Total Num Words
wfss_8IntegerRecommendedEEG Total number of wrong letter errors
wfss_9IntegerRecommendedEEG Word Fluency Total Num Valid
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: eegeventform01 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.