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About fcx-3

Information about fcx-3 (frontal cortex, number 3).

Summary

This data set contains EEG recordings from the lateral frontal and parietal regions from 7 human adults while they were performing a visuospatial working memory task. The recordings were intracranial (iEEG) recording subdurally or stereotactically with 4, 5 or 10 mm spacing between channels, sampled at 1 kHz or 512 Hz. Subjects were 7 epileptic patients (mean ± SD [range]: 25.4 ± 3.3 years of age, 4 males). Primary (filtered) and derived (fully preprocessed) iEEG data, and analysis scripts included.

The recordings from each participant were made during a visuospatial working memory task. Each trial consisted of five phases: pretrial, encoding, pre-cue delay, post-cue delay, and response. Following a 1-s pretrial fixation interval, participants were cued to focus on either IDENTITY or RELATION information. Then, two common-shape stimuli were presented for 200 ms each on the in the center of the screen in a specific spatiotemporal configuration (i.e., top/bottom spatial and first/second temporal positions). After a 900- or 1150-ms jittered pre-cue delay fixation interval, the test prompt appeared, followed by a post-cue delay fixation interval of the same length. Working memory was tested in a two-alternative forced choice test, resulting in a 0.5 chance rate. In the identity test, subjects indicated whether the pair was the SAME pair they just studied (50% yes/no). In the spatiotemporal relation test, subjects indicated which shape fit the TOP/BOTTOM spatial or FIRST/SECOND temporal relation prompt (50% per stimulus). Participants completed 120 trials.

Methods, participants, and results are described in:

Johnson, E. L., King-Stephens, D., Weber, P. B., Laxer, K. D., Lin, J. J., Knight, R. T. Spectral imprints of working memory for everyday associations in the frontoparietal network. Frontiers in Systems Neuroscience 12, 65 (2019). doi:10.3389/fnsys.2018.00065

Format of the data

Data are mostly in .mat matlab format, there are also .csv files. More information is given in the data description document, linked to at the bottom of this page. Total size of the data is about 12 GB.

How to download the data

The data must be downloaded from:

https://portal.nersc.gov/project/crcns/download/fcx-3

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.

How to cite the data

Anyone wishing to publish results from this dataset should consult the lead researcher, E. L. Johnson (eljohnson@berkeley.edu) and cite the publication above (Johnson et al., 2019) and cite the data set using the following:

Elizabeth Johnson (2019); Intracranial EEG recordings of lateral frontal and parietal regions in 7 human adults performing a visuospatial working memory task. CRCNS.org
http://dx.doi.org/10.6080/K06971S9

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_fcx-3_data_description.pdf

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