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Each recording and corresponding metadata, single unit properties and quality metrics were packaged in the [Neurodata Without Borders: Neurophysiology version 2.0 (NWB:N 2.0) data format](https://www.nwb.org/) using the [MatNWB API](https://github.com/NeurodataWithoutBorders/matnwb). A single NWB file was created from each recording. NWB files were placed in folders based on the identifier of the animal (from Rat01 to Rat20), probe insertion sequence (Insertion1 or Insertion2) and cortical depth (from Depth1 to Depth3). The filename of the NWB file (identifier) was constructed by concatenating the above information (e.g., Rat01_Insertion2_Depth3).
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-The CSV file named "Animal_characteristics_and_targeted_cortical_areas" contains information about the weight and sex of animals, as well as contains the cortical area and stereotaxic coordinates corresponding to each probe insertion. The "Recording_characteristics" CSV file lists several useful properties for each NWB file including the file size, the duration of the recording, the single unit yield, the cortical location, the degree of power line (50 Hz) noise contamination (given by the power spectral density value measured at 50 Hz, and also by the ratio of the power spectral density measured at 50 Hz to the power spectral density measured at 49 Hz), the RMS noise and RMS signal levels. For further details on the estimation of noise and signal levels, see.
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+The CSV file named "Animal_characteristics_and_targeted_cortical_areas" contains information about the weight and sex of animals, as well as about the cortical area and stereotaxic coordinates corresponding to each probe insertion. The "Recording_characteristics" CSV file lists several useful properties for each NWB file including the file size, the duration of the recording, the single unit yield, the cortical location, the degree of power line (50 Hz) noise contamination (given by the power spectral density value measured at 50 Hz, and also by the ratio of the power spectral density measured at 50 Hz to the power spectral density measured at 49 Hz), the RMS noise and RMS signal levels. For further details on the estimation of noise and signal levels, see.
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Each NWB file contains several main groups which are similar to directories. The *acquisition* group contains the continuous wideband 128-channel data (‘wideband_multichannel_recording’) in a compressed form, as well as several parameters related to the raw data such as the measurement unit or the data conversion number. The *general* group contains metadata about the experiments and consists of several subgroups, related to the recording probe (‘general/devices’; ‘general/extracellular_ephys’) or the subjects of the experiments (‘general/subject’). Former subgroups carry information about the probe location (brain area and stereotaxic coordinates) and the relative positions and laminar location of recordings sites, while the latter contains metadata about the animal (e.g., sex, species, subject ID, or weight). Information about spike sorting and single units and corresponding data are available in the *units* group. For each unit, we included here the mean and standard deviation of their spike waveform on all channels, calculated both from the filtered (‘mean_waveform_all_channels_filt’; ’waveform_sd_all_channels_filt’) and the wideband data (‘mean_waveform_all_channels_raw’; ’ waveform_sd_all_channels_raw’). For an easier visualization of the multichannel spike waveform in two dimensions, we have also added an array which contains the mean spike waveform in the 32 x 4 shape of the electrode array (‘mean_waveform_all_channels_filt_32x4’; ’mean_waveform_all_channels_raw_32x4’). Furthermore, the spike waveform recorded on the channel with the largest spike (i.e., peak waveform channel) was saved separately (‘mean_waveform_peak_channel_filt’, ‘mean_waveform_peak_channel_raw’). Several single unit properties and cluster quality metrics, as well as the spike times and spike count of each unit were saved in the *units* group. Furthermore, to aid users in selecting and analyzing a subset of this dataset appropriate for the research goals, we also created an NWB file (‘allSingleUnits.nwb’) which contains all single units with all the properties listed above, along with the identifier of the recording they originate from (the identifier is located in ‘units/session_id’). The structure if NWB files can be explored using the [HDFView](https://www.hdfgroup.org/downloads/hdfview/) software.
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