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 Task Questionnaire



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/projectsubject_id
interview_dateDateRequiredDate on which the interview/genetic test/sampling/imaging/biospecimen was completed. MM/DD/YYYYRequired fielddate_ctq, date_nl, v2_ctq_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.v2_ctq_age
sexString20RequiredSex of the subjectM;FM = Male; F = Femalegender
eng_firstIntegerRecommendedIs English your first language?0;10 = No; 1 = Yeseeg_s_01
eeg_s_01_aFloatRecommendedChecks how many years speaking English
cfmh_chd_hearingimpIntegerRecommendedDoes the patient have a hearing impairment?1;00 = No; 1 = Yeseeg_s_02
hear_prob_spfyString255RecommendedNotes about hearingeeg_s_02_a
eeg_s_02_bString250RecommendedDid you receive a diagnosis or treatment of your hearing problem?
eeg_s_03FloatRecommendedIn the past 24 hours, how many drinks containing caffeine (i.e. coffee, tea, soda, energy drink, etc.) did you have?nl_cafdrinks
eeg_s_04FloatRecommendedIn the past 24 hours, how many times did you use cigarettes, tobacco or nicotine?nl_tob
eeg_s_05FloatRecommendedIn the past 24 hours, how many drinks containing alcohol (i.e. beer, wine, mixed drinks) did you have?nl_drinks
eeg_s_06IntegerRecommendedIn the last 24 hours, how many times have you taken any drugs to get high, feel better, or to change your mood?
rwd_ts01IntegerRecommendedHow well do you think you did on the task?1::51=Very well; 2=Okay; 3=Average; 4=Poor; 5=Very poor
rwd_ts02IntegerRecommendedHow difficult was the task?1::51=Very difficult; 2=Moderately difficult; 3=Neutral; 4=Moderately easy; 5=Very easy
rwd_ts03IntegerRecommendedHow stressful was the task?1::51=Very stressful; 2=Moderately stressful; 3=Neutral; 4=Moderately unstressful; 5=Not at all stressful
rwd_ts04IntegerRecommendedDid you feel that one of the mouths was easier to detect during the task?0;10=No; 1=Yes
rwd_ts05IntegerRecommendedWhich mouth?0;10=Short; 1=Long
rwd_ts06IntegerRecommendedDid you like or prefer one mouth more than the other?0;10=No; 1=Yes
rwd_ts07IntegerRecommendedWhich mouth?1;22=Short; 1=Long
subject_descriptionString4,000RecommendedSubject related information (e.g the affection, phenotype, disease information, etc.).
siteString101RecommendedSiteStudy Site
weekFloatRecommendedWeek in level/study99=week 10-week 14
sm_3b6IntegerRecommendedTried non-cigarette tobacco or nicotine product - nicotine patch?1;01=Yes; 0=Nonl_nicpat
nl_lastcafFloatRecommendedLast time had drinks containing caffeine (i.e. coffee, tea, soda, energy drink, etc.) did you have?In hours, before testing
nl_lasttobFloatRecommendedLast time did you use cigarettes, tobacco or nicotine?In hours, before testing
nl_lastalcFloatRecommendedLast time had drinks containing alcohol (i.e. beer, wine, mixed drinks) did you have?In hours, before testing
nl_tobproIntegerRecommendedHave you used any tobacco products (cigarettes, pipe, chewing tobacco, etc.) in the past 24 hours?0;11 = Yes; 0 = No
nl_cafbevIntegerRecommendedHave you had any caffeinated beverages in the past 24 hours?0;11 = Yes; 0 = No
nl_alcIntegerRecommendedHave you had any alcoholic beverages in the past 24 hours?0;11 = Yes; 0 = No
peq_1IntegerRecommendedWere you uncomfortable with the cap on?1; 0; 888; 999
peq_2IntegerRecommendedDid you feel anxious before the EEG session?1; 0; 888; 999
peq_3IntegerRecommendedDid you ever get sleepy during the recordings?1; 0; 888; 999
peq_4IntegerRecommendedDid you ever stop paying attention during the task?1; 0; 888; 999
visnumFloatRecommendedNumeric Visit Number-1.5 = Pre-Screening; -1 = Screening; 0 = Baseline; ## = Visit ## (from 1 to 10); Whole numbers = standard monthly visits; #.001 - #.009 = Unscheduled; #.1 = End of Phase 1; #.2 = End of Phase 2; #.3 = End of Phase 3; #.4 = End of Open Choice Phase; #.5 = End of Study; #.6 = Genetic Analysis; 1000=all visits
days_baselineIntegerRecommendedDays since baseline
caq_1bIntegerRecommendedCoffee, brewed (drip) - in the last 24 hours, cups (1 cup=8-ounce)
caq_5bIntegerRecommendedTea, brewed - in the last 24 hours, cups (1 cup=8-ounce)
caq_8bIntegerRecommendedSoft drink - in the last 24 hours, cups (1 cup=8-ounce)
rb_4IntegerRecommendedInvesting 10% of your annual income in a moderate growth diversified fund. (F/I)1::71 = Not benefits at all; 4 = Moderate benefits; 7 = Great benefits
rb_5IntegerRecommendedDrinking heavily at a social function. (H/S)1::71 = Not benefits at all; 4 = Moderate benefits; 7 = Great benefits
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: eegtaskquest01 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.