The NSD dataset can be conceptually divided into raw data (i.e. data with little or no additional processing) and prepared data (i.e. transformations of the raw data that have been performed in order to make the data more accessible and more convenient to use). The pre-processing methods that we used to create the prepared data are formally described in the NSD data paper, with technical details documented in this NSD Data Manual. Most of the remainder of the data manual after this page is specific to the prepared data and not the raw data. Note that a few of the scan sessions are currently held out from the public release (i.e. the raw data for this sessions are listable but not downloadable); see Overview of the data for more information.
nsddata_rawdata/
This contains the raw data that were collected as part of the NSD effort. It is organized in BIDS format. Note that the data contained here are primarily the structural, functional, and diffusion MRI scans. Some of what might be considered raw data are contained elsewhere in the NSD directory structure. For example, various behavioral measures (see Behavioral data) are provided in nsddata; stimulus images and experimental information are provided in nsddata_stimuli and nsddata (see Experiments); and raw eyetracking data are provided in nsddata_timeseries (see Time-series data).
Note that the content of the .tsv files with task information essentially mirrors the contents of the "responses.tsv" file (as described in Behavioral data).
Naming of the different "tasks" in the raw BIDS data:
The main NSD experiment is like "task-nsdcore_run-NN" where NN ranges from 01 to 12. The resting-state experiment is like "task-rest_run-N" where N ranges from 1 to 2. In the scan sessions involving resting-state, the chronological acquisition order was:
rest1
nsd01
nsd02
nsd03
nsd04
nsd05
nsd06
nsd07
nsd08
nsd09
nsd10
nsd11
nsd12
rest2
The prf experiment is like "task-prfbar_runNN" where NN ranges from 01 to 03 and "task-prfwedge_runNN" where NN ranges from 01 to 03. The floc experiment is like "task-floc_runNN" where NN ranges from 01 to 06. The chronological acquisition order in the prffloc scan session was:
prfbar01
prfwedge01
floc01
floc02
prfbar02
prfwedge02
floc03
floc04
prfbar03
prfwedge03
floc05
floc06
The nsdsynthetic experiment is like "task-fixation_runNN" where NN ranges from 01 to 04 and "task-memory_runNN" where NN ranges from 01 to 04. Note the fixation and memory were interleaved and acquired in the following chronological order:
fixation01
memory01
fixation02
memory02
fixation03
memory03
fixation04
memory04
The nsdimagery experiment is like "task-vis[A-C]", "task-att[A-C]", and "task-img[A-C]_runNN" where NN ranges from 01 to 02. The chronological order was: