RT Disengagement

# Repetitive Thought Disengagement
Participants provided self-generated repetitive thought (RT) topics during an interview on a preceding session, which were converted to scanner stimuli. The fMRI task was completed on a subsequent visit, during which they were also instructed in worry disengagement strategies. The task comprised 3 runs of 9 trials each. For each trial, self-generated RT stimuli were presented for ~30s, followed by a 30s disengagement period in which participants completed a competing attention task (the Sustained Attention to Responses Task, SART). Following the SART, participants responded to thought probes including degree of uncontrollability of thoughts (i.e., disengagement success).

# Data included: #
All imaging data was collected on a 3T MRI scanner (MAGNETOM Verio syngo MR B17, Siemens Corporation) with a 64-channel radio-frequency (RF) head coil array.

### Anatomical
T1-weighted structural images (1 mm3 voxels) were acquired in the sagittal plane with an isotropic MPRAGE sequence using a parallel imaging factor of 2 (TR=2500, TE=2.90, TI = 1070, flip angle = 8º, voxel size = 1.0mm3, matrix size 256x256).

### Functional
Functional data were collected as T2*-weighted gradient-echo echo-planar images with a multiband acceleration factor of 3 (TR = 2000, TE = 30, flip angle = 79º, echo spacing = 0.62, voxel size = 2.0mm3, matrix size 106x106, transversal orientation, 72 interleaved slices).

### Fieldmap
Two opposite phase-encoding (A>>P, P>>A) field maps were collected with resolution 3.0x3.0x2.0mm and matrix size 72x72.

# Preregistration: #
This dataset corresponds to pre-registered analyses which can be found here: https://osf.io/qy4df.

# Data collection and acknowledgements: #
Data were collected at the CMU-Pitt Brain Imaging Data Generation & Education (BRIDGE) Center in Pittsburgh, PA, USA.
Funding was provided by the National Institute of Mental Health K01MH116328 (PI: Hallion).

# Authors: #
Cecilia A. Westbrook1, Brittany Alberts2, M. Kathleen Caulfield3, Mary Blendermann2, Peter J. Gianaros12, Jonathan Smallwood4, Jennifer S. Silk12, and Lauren S. Hallion5
1Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
2Department of Psychology, University of Pittsburgh, Pittsburgh, PA, USA
3Reason Research, Philadelphia, PA, USA
4Department of Psychology, Queen's University, Kingston, ON, CA
5Department of Psychology, University of Regina, Regina, SK, CA