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About ofc-4

Information about ofc-4 (orbitofrontal cortex, number 4).

Summary.

This dataset contains the preprocessed fMRI time series within orbitofrontal cortex (OFC), the design matrix and event timing information of the task performed in the work of:

Schuck, Nicolas W., Ming Bo Cai, Robert C. Wilson, and Yael Niv. "Human orbitofrontal cortex represents a cognitive map of state space." Neuron 91, no. 6 (2016): 1402-1412
https://www.ncbi.nlm.nih.gov/pubmed/27657452

In the task, participants watched overlapping face and house images and judged the age of one category to be young or old (meaning modern or ancient for houses). The specific rule of which category to judge required participants to keep track of which state out of 16 in total they are in. The result support the theory that orbitofrontal cortex encodes task-relevant hidden states of environments. The data of 24 healthy human participants used in the trial-wise analysis in the paper are included. Except for the first participant who had four successful runs of data, all participants had five runs of data. The fMRI time series were slice-timing corrected and spatially realigned to correct for head motion within and across experiment runs. An evaluation of an algorithm of Bayesian representational similarity analysis (BRSA) against other approaches of representational similarity analysis by Cai, et al. PLOS Computational Biology, 2019 (https://www.biorxiv.org/content/10.1101/347260v1) was partly based on this dataset. The work suggested that performing RSA based on activity pattern estimated from the same runs suffer from statistical bias in the similarity matrix, and recommended either BRSA or cross-run RSA.

Format of the data.

The data is stored in .mat files. Details of the format are provided in the document link to at bottom of this page.  Total size of the data is about 133 MB.

How to download the data.

The data must be downloaded from:

https://portal.nersc.gov/project/crcns/download/ofc-4

A CRCNS.org account is required.  This link allows bulk downloading of multiple files using the download script as described in the "Alternative download method" section on the download page.

Getting help using the data.

If you have questions about using the data, post them on the forum for using data sets.

Conditions for using the data

The data can be used for any scientific analysis and publication. You are welcome, but not required, to notify Nicolas Schuck (neurcode@mpib-berlin.mpg.de) or Yael Niv (yael@princeton.edu) of any publication related to the data. If you publish any work using the data, please cite the publication above (Schuck et al., 2016) and cite the data set using the following:

Schuck, Nicolas W., Ming Bo Cai, Robert C. Wilson, and Yael Niv (2019); fMRI time series in orbitofrontal cortex during face-house state-space task. CRCNS.org.
http://dx.doi.org/10.6080/K0FN14CH

The above citation uses a Digital Object Identifier (DOI) which is assigned to the data set.  The DOI was created using DataCite (www.datacite.org) and the California Digital Library, "EZID" system (n2t.net/ezid/).

Documentation files

crcns_ofc-4_data_description.pdf

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