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About hc-6

Information about the hc-6 data set.


The hc-6 data set contains data recorded in the lab of Loren Frank at UCSF.  The data was recorded from hippocampus regions CA1 and CA3 (or MEC and CA1) from nine male Long-Evans rats before, during and after the animals performed an alternate choice task in one of two W-shaped tracks.  The data was used to determine relationships between activity in hippocampus neurons to information representation, learning and decision making as described in the following papers:

Hippocampal SWR Activity Predicts Correct Decisions during the Initial Learning of an Alternation Task. Annabelle C. Singer, Margaret F. Carr, Mattias P. Karlsson, and Loren M. Frank (2013). Neuron, Volume 77, Issue 6, 20 March 2013, Pages 1163–1173

Transient Slow Gamma Synchrony Underlies Hippocampal Memory Replay. Margaret F. Carr, Mattias P. Karlsson, and Loren M. Frank. Neuron 75, 700–713, 2012

Awake replay of remote experiences in the hippocampus. Mattias P Karlsson & Loren M Frank. Nat Neurosci. 2009 Jul;12(7):913-8

Network Dynamics Underlying the Formation of Sparse, Informative Representations in the Hippocampus. Mattias P. Karlsson and Loren M. Frank. The Journal of Neuroscience, 24 December 2008, 28(52): 14271-14281

Format of the data

Data from each animal is stored in a single directory.  Data are stored in Matlab files, with different files used for the different types of data.  The types of data are: raw position, interpolated position, spiking data from clustered units, task information, tetrode information, anatomical location of each recorded cell and local field potentials.   Details are given in the data description document listed at the bottom of this page.  Total data size is about 22GB compressed.

Conditions for using the data 

These data required years of effort to collect, and it is the lab policy that anything published using these data list the person who collected the data and Dr. Frank as authors. Please contact Dr. Frank if you would like to discuss this ( The data were collected by Dr. Mattias Karlsson (animals Bond, Frank, Conley, Dudley, Miles and Ten) and Dr. Margaret Carr (animals Coriander and Five). Also, any publications made using the data should cite the data set using the following:

Mattias Karlsson, Margaret Carr, Loren M. Frank. (2015)
Simultaneous extracellular recordings from hippocampal areas CA1 and CA3 (or MEC and CA1) from rats performing an alternation task in two W-shapped tracks that are geometrically identically but visually distinct.

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

Data may be downloaded from:
A account is required. See the download link for more instructions.

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