An MRI dataset of human participants in Object Matching Task

The dataset included 33 human participants' MRI T1 image, BOLD images, Fieldmap images, and behavioral records.-ParticipantsParticipant No.1-10 were group1 recruited in Tsinghua University, Participant No.11-20 were group2 recruited in Peking University, Participant No.21-35 were group3 recruited in Tsinghua University. Participant 19 and 31 were not included in the dataset due to unacceptably low task performance.-Object Matching TaskThe task employed a classic visual stimuli, named "greeble", and created a conceptual two dimensional space using a series of unique greeble variants. Within this space, each location was represented by a unique greeble variant characterized by the lengths of two features, namely “Loogit” and “Vacso,” which correspond to the two dimensions of the space. The greeble positioned at the center of the space served as the prototype, acting as the target. In each trial, a greeble variant, pseudo-randomly selected from the periphery of the space, was presented on the screen. Participants were instructed to adjust the length of Loogit and Vasco independently via button press to match the prototype as accurately as possible within a 10-s time limit. Additionally, they were encouraged to make adjustments to both features simultaneously (one unit of adjustment on one feature followed by one unit of adjustment on another) as much as possible. No feedback was provided for all the trials. The task was conducted twice in two consecutive days, one for behavioral training and the other for fMRI scan. Please note that only the data of day 2 was included in this repository. The data included 8 experimental sessions with 40 trials each, these 320 trials took about 1 hour scanning. Each session included 4 lure trials, here a blank screen was shown.-MRI deviceAll participants were scanned using a Siemens Prisma 3T scanner.-MRI dataT1, BOLD, and Fieldmap images have been converted from DICOM to NIfTI format.Folder "MRI_T1" included the T1 images for all participants, "sub1_t1.nii.gz" indicates "Subject 1".Folder "MRI_Fieldmap_magnitude" and "MRI_Fieldmap_phase" included the fieldmap magnitude and phase file, respectively.BOLD images were included in root folder. For example, "sub1_s3.nii.gz" indicates the 4D BOLD images for Subject 1, Session 3.-Behavioral recordsTwo types of behavioral data were included in the Folder "TXT_behaivor". Take Participant 1 as example:In the file 'sub1_mri_record.txt', there are 320 rows representing the 320 trials. Each row contains 13 columns with the following information:1.Participant Number2.Session Number3.Movement Direction: Defined by the starting and goal locations.4.Starting Location (X-coordinate, greeble space)5.Starting Location (Y-coordinate, greeble space)6.Ending Location (X-coordinate, greeble space) of the Participant7.Ending Location (Y-coordinate, greeble space) of the Participant8.Error Size: Calculated as the distance between the ending location and the goal location.9.Time Key 'S' was Triggered: MRI trigger time in each session.10.Time Fixation Displayed on Screen11.Time Stimulus Displayed on Screen12.Time Trial End13.Participant CompensationNote: Rows containing 'NA' represent lure trials.In the file 'sub1_mri_detail.txt', each row represents a timeframe, and contains 15 columns with the following information for the timeframe:1.Participant Number2.Session Number3.Trial Number4.Movement Direction: Defined by the starting and goal locations.5.Starting Location (X-coordinate, greeble space)6.Starting Location (Y-coordinate, greeble space)7.Ending Location (X-coordinate, greeble space) of the Participant8.Ending Location (Y-coordinate, greeble space) of the Participant9.Starting Location (X-coordinate, pixel space)10.Starting Location (Y-coordinate, pixel space)11.Ending Location (X-coordinate, pixel space) of the Participant12.Ending Location (Y-coordinate, pixel space) of the Participant13.Time Key 'S' was Triggered: MRI trigger time in each session.14.Time Stimulus Displayed on Screen15.Time of current movement.-Slice Timing fileSlice timing file were included in the root folder for data preprocessing.