Instantaneous frequency profiles of theta cycles

Quinn AJ
Lopes-dos-Santos V
Nobre AC
Dupret D
Woolrich MW

This dataset contains the local field potentials recorded from 10 tetrodes located in the mouse dorsal CA1 hippocampus and the simultaneous movement tracking data for two recording sessions, from each of three mice. There are three subdirectories, each containing four datafiles: two raw 64-channel .eeg files (binary file; 1,250Hz sampling; hence, sample interval is 800 microsecs) and two .whl files (text file; 39.0625Hz sampling; an ordered list of X,Y locations of the animal; 2-column <float> <float> format).

All data recordings are made during open field exploration. The data runs ending with *_2.eeg and *_2.whl correspond to exploration of a familiar environment and the runs ending with *_5.eeg/*_6.eeg and *_5.whl/*_6.whl correspond to exploration of a novel environment.

Each subfolder contains two meta-data files. A .desel file that reports the location of each tetrode. In this dataset a value of ‘1’ indicates CA1; ‘cx’ indicates cortex. A .par file that describes the acquisition parameters of the dataset, the correspondence between individual channels and tetrodes (max 4 channels per tetrode), and the list of whitelisted channels suitable for further analysis. A commented example of a par file is below (though the actual files do not contain comments)


64 16                  # total n_channels        n_systembits (int16 values - 2 bytes)

10                       #total n_tetrodes 

4 0 1 2 3            #1st_tetrode: total n_channels individual_channel_IDs

3 5 6 7               #2nd_tetrode: total n_channels individual_channel_IDs

4 8 9 10 11       #3rd_tetrode: total n_channels individual_channel_IDs

3 12 13 14       

4 16 17 18 19 

1 20                            

4 24 25 26 27 

4 28 29 30 31 

4 32 33 34 35 

4 36 37 38 39    #10th_tetrode: total n_channels individual_channel_IDs          


Example codes for the analysis of this data is available for download at

A local field potential plotted and the top in black, and plots of six extracted 'intrinctic mode functions' (IMFs) which are oscillatory, each at a different frequency, with amplitude for each changing throughout the plotted period. The bottom plot, IMF 6, theta, is a large and fairly constant amplitude.
Year Published
Funders & Grant Numbers
Biotechnology and Biological Sciences Research Council, UKRI (BB/N002547/1)
MRC, UKRI (MC_UU_12024/3)
MRC, UKRI (MC_UU_00003/4)
University of Oxford
First Published In
Lopes-Dos-Santos V, van de Ven GM, Morley A, Trouche S, Campo-Urriza N, Dupret D
2018. Neuron, 100(4):940–952.
Dupret Group

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