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About hc-21

Information about the hc-21 data set.


The dataset is made of 101 cells recorded in the hippocampus from two Rhesus macaques. Recordings were made extracellularly with either single tungsten electrodes or 16 contact u-probes. Activity was recorded as animals were navigating via a joystick a virtual maze projected in stereo, searching for a reward in two successive mazes: a familiar one and a daily new one. Both mazes contained five landmarks that could be used to find reward. Each file contains the timestamps of the action potentials, the X,Y position and camera orientation in virtual coordinates, the left and right eye X,Y coordinates, and task relevant event codes. For each file, two subfields correspond to the familiar maze (“famallo’), and the new maze (“newallo”). These fields contain the behavioral trial information for path entry and identity, choices made by the animal as described below. The dataset also contains the animal coordinates in the state space graph developed to analyze the neural data (Wirth et al., 2017). Each file corresponds to two recording sessions of approximatively 30 minutes each. e.g. Results from the experiments are described in:

Gaze-informed, task-situated representation of space in primate hippocampus during virtual navigation, Sylvia Wirth, Pierre Baraduc, Aurélie Planté, Serge Pinède, Jean-René Duhamel (2017). PLoS Biology.

Format of the data

The data are stored in matlab. Details are given in the data description document listed at the bottom of this page.  Total data size is about 2.5 GB.

Conditions for using the data

These data required years of effort to collect, and it is the CNRS lab policy that anything published using these data lists as authors the persons who collected the data and the group leader under whose responsibility the data has been collected. Please contact Sylvia Wirth if you would like to discuss this ( The data was collected by Sylvia Wirth and Aurélie Planté, under the supervision of Jean-René Duhamel. In addition to including, as authors the persons who collected the data, cite the publications given above if consulted and also cite the data using the following:

Wirth S, Barraduc P, Planté P, Spinède S, Duhamel JR (2018); Extracellular recordings from macaque hippocampus while navigating via a joystick a familiar and unfamiliar virtual maze projected in stereo, and binocular eye movements.

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

How to download the data

The data may be downloaded from:
Using a account.  See the download link for more information about downloading.

Getting help using the data.

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

Documentation files


Document Actions