LA5C

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LA5C

The LA5C was a nested study within LA2K, furthering the work to include patients. The assessed population included 200 healthy controls recruited from LA2K, 100 schizophrenia patients, 100 bipolar patients, and 100 ADHD patients.


See here for the LA2K manual: LA2k_manual. 

Participants

The participants, ages 21-50, were recruited by community advertisements from the Los Angeles area and completed extensive neuropsychogical testing, in addition to fMRI scanning. To be included individuals had to be either “White, Not of Hispanic or Latino Origin” or “Hispanic or Latino, of Any Race” following NIH designations of racial and ethnic minority groups, and have completed at least 8 years of education (other racial and ethnic minority groups were excluded because this was thought to increase risk of confounding planned genetic studies). For participants who spoke both English and Spanish, language for testing was determined by a verbal fluency test. Participants were screened for neurological disease, history of head injury with loss of consciousness or cognitive sequelae, use of psychoactive medications, substance dependence within past 6 months, history of major mental illness or ADHD, and current mood or anxiety disorder. Self-reported history of psychopathology was verified with the SCID-IV (First, Spitzer, Gibbon, & Williams, 1995). Urinalysis was used to screen for drugs of abuse (cannabis, amphetamine, opioids, cocaine, benzodiazepines) on the day of testing and excluded if results were positive.

A portion of this large sample took part in two separate fMRI sessions, which each included one-hour of behavioral testing and a one-hour scan on the same day. Participants were recruited from the parent study to participate in the fMRI portion if they successfully completed all previous testing sessions, and did not meet the following additional exclusion criteria: history of significant medical illness, contraindications for MRI (including pregnancy), any mood-altering medication on scan day (based on self-report), vision that was insufficient to see task stimuli, and left-handedness.

After receiving a thorough explanation, all participants gave written informed consent according to the procedures approved by the University of California Los Angeles Institutional Review Board.

Contact People

For more information on the LA5C please contact:
Eliza Congdon, Ph.D. email econgdon@ucla.edu
Katie Karlsgodt, Ph.D. email kkarlsgo@ucla.edu
Russell Poldrack, Ph.D. email poldrack@mail.utexas.edu
Fred Sabb, Ph.D. email fwsabb@gmail.com

General Methods

link to LA5C manual

overall study design (scan A, scan B, etc)

id numbers

counterbalancing

Facilities

BMC
CCN

Measures

Image Acquisition:
Parameters
Procedure

Functional:
BART
BREATH HOLDING
PAM
RESTING STATE
SCAP
STOPSIGNAL
TASKSWITCHING

Structural:
DTI
MATCHED BANDWIDTH HIRES
MPRAGE

Physio Acquisition
Physio Data Setup

Preprocessing and Quality Control

Preprocessing:

Quality Control
LA5C Exclusions: Withdrawn, Dropped, Unusable
LA3C ID Switches
LA5C CCN Re-Scans
BMC/CCN Scanner Switch & Marker History
MPRAGE Motion
BOLD Motion

DTI Quality Control
Freesurfer Quality Control

Final Tables of Usables Ns

Notes on changes made to HTAC Database or Final Log Files post-QC Completion (6/13/12)

Requesting and Analyzing Data

CNP_data_query_policy

Notes on Downloading Imaging Workflow Data




Link back to HTAC page.