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‎microephys_ecephys_bep032/README.md‎

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# Ephys NIX Dataset
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# Massively parallel multi-electrode recordings of macaque motor cortex during an instructed delayed reach-to-grasp task
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This dataset contains electrophysiology recordings organized according to BEP032 standards.
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## Summary
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We provide two electrophysiological datasets recorded via a 10-by-10 multi-electrode array chronically implanted in the motor cortex of two macaque monkeys during an instructed delayed reach-to-grasp task ([Brochier et al., 2018](http://doi.org/10.1038/sdata.2018.55)). The datasets contain the continuous measure of extracellular potentials at each electrode sampled at 30 kHz, the local field potentials sampled at 1 kHz and the timing of the online and offline extracted spike times. It also includes the timing of several task-related and behavioral events recorded along with the electrophysiological data. Finally, the datasets provide a complete set of metadata structured in a standardized format. These metadata allow easy access to detailed information about the datasets such as the settings of the recording hardware, the array specifications, the location of the implant in the motor cortex, information about the monkeys, or the offline spike sorting.
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The two datasets can be exploited to address crucial issues in neurophysiology such as: What are the principles of neural interactions in a local cortical network and how are these interactions modulated during a well-described behavioral task? How different neuronal signals such as single-unit activity, multi-unit activity or LFPs relate to each other? Which spike sorting methods provide the best estimate of single unit activity?

‎microephys_ecephys_bep032/sub-i/ses-140703/ecephys/sub-i_ses-140703_task-r2g_run-001_channels.json‎

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{
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"channel_id": {
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"description": "Identifier for the channel. Corresponds to the channel number in the source data file."
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},
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"contact_id": {
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"description": "Identifier for the contact. 'n/a' indicates not applicable or not specified."
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},
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"sampling_frequency": {
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"description": "Sampling frequency of the channel in Hz."
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},
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"units": {
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"description": "Units of the recorded signal.",
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"levels": {
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"uV": "Microvolts"
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}
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},
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"channel_name": {
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"description": "Descriptive name of the channel."
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},
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"file_origin": {
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"description": "Path to the source data file from which this channel's data originates."
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},
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"connector_id": {
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"description": "Identifier for the connector used for this channel."
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},
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"connector_pin_id": {
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"description": "Identifier for the pin on the connector used for this channel."
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},
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"nev_dig_factor": {
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"description": "Digital conversion factor for Neuralynx (NEV) data."
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},
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"nb_sorted_units": {
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"description": "Number of sorted units for this channel. 0 indicates no sorted units."
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},
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"nsx": {
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"description": "Neuralynx NSx file version or type. E.g., 2 for NS2, 5 for NS5."
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},
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"hi_pass_freq": {
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"description": "High-pass filter frequency in Hz. 'n/a' indicates no high-pass filter applied or not specified."
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},
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"lo_pass_freq": {
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"description": "Low-pass filter frequency in Hz. 'n/a' indicates no low-pass filter applied or not specified."
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},
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"hi_pass_order": {
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"description": "Order of the high-pass filter. 'n/a' indicates no high-pass filter applied or not specified."
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},
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"lo_pass_order": {
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"description": "Order of the low-pass filter. 'n/a' indicates no low-pass filter applied or not specified."
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},
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"filter_type": {
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"description": "Type of filter applied. 'n/a' indicates no filter applied or not specified.",
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"levels": {
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"n/a": "No filter applied or not specified.",
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"butterworth": "Butterworth filter"
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}
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},
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"electrode_reject_HFC": {
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"description": "Boolean indicating if high-frequency common mode rejection was applied to the electrode.",
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"levels": {
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"TRUE": "High-frequency common mode rejection was applied.",
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"FALSE": "High-frequency common mode rejection was not applied.",
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"n/a": "Not applicable or not specified."
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}
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},
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"electrode_reject_LFC": {
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"description": "Boolean indicating if low-frequency common mode rejection was applied to the electrode.",
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"levels": {
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"TRUE": "Low-frequency common mode rejection was applied.",
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"FALSE": "Low-frequency common mode rejection was not applied.",
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"n/a": "Not applicable or not specified."
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}
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},
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"electrode_reject_IFC": {
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"description": "Boolean indicating if intermediate-frequency common mode rejection was applied to the electrode.",
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"levels": {
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"TRUE": "Intermediate-frequency common mode rejection was applied.",
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"FALSE": "Intermediate-frequency common mode rejection was not applied.",
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"n/a": "Not applicable or not specified."
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}
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},
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"connector_aligned_ids": {
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"description": "Identifier for aligned connectors. 'n/a' indicates not applicable or not specified."
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},
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"coordinates_x": {
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"description": "X-coordinate of the channel/electrode position. 'n/a' indicates not applicable or not specified."
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},
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"coordinates_y": {
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"description": "Y-coordinate of the channel/electrode position. 'n/a' indicates not applicable or not specified."
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},
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"channel_type": {
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"description": "Type of channel.",
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"levels": {
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"BEH": "Behavioral channel",
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"EXT": "External channel"
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}
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}
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}

‎microephys_ecephys_bep032/sub-i/ses-140703/ecephys/sub-i_ses-140703_task-r2g_run-001_electrodes.json‎

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{
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"electrode_id": {
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"description": "Identifier for the electrode. Corresponds to the electrode number on the probe."
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},
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"probe_id": {
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"description": "Identifier for the probe to which the electrode belongs.",
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"levels": {
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"Prob-1025-0503": "Probe model 1025-0503"
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}
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},
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"x": {
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"description": "X-coordinate of the electrode position in millimeters, relative to a defined origin (e.g., probe tip or a common anatomical landmark)."
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},
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"y": {
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"description": "Y-coordinate of the electrode position in millimeters, relative to a defined origin (e.g., probe tip or a common anatomical landmark)."
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},
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"z": {
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"description": "Z-coordinate of the electrode position in millimeters, relative to a defined origin (e.g., probe tip or a common anatomical landmark)."
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},
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"impedance": {
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"description": "Measured impedance of the electrode."
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},
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"material": {
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"description": "Material of the electrode contact.",
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"levels": {
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"iridium oxide": "Iridium oxide"
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}
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},
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"location": {
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"description": "Anatomical location of the electrode, often referring to a specific brain area.",
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"levels": {
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"M1": "Primary Motor Cortex"
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}
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},
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"hemisphere": {
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"description": "Hemisphere in which the electrode is located.",
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"levels": {
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"right": "Right hemisphere",
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"left": "Left hemisphere"
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}
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},
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"connector_aligned_id": {
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"description": "Identifier for the aligned connector pin associated with this electrode."
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},
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"impedance_unit": {
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"description": "Unit of impedance measurement.",
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"levels": {
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"kOhm": "Kiloohm"
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}
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},
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"insulation": {
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"description": "Type of insulation material used for the electrode.",
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"levels": {
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"Parylene-c": "Parylene-c"
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}
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}
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}

‎microephys_ecephys_bep032/sub-i/ses-140703/ecephys/sub-i_ses-140703_task-r2g_run-001_events.json‎

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{
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"onset": {
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"Description": "Onset of the trial, defined by the 'TS-ON' (Trial Start) event marker.",
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"Units": "s"
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},
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"duration": {
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"Description": "Duration of the trial, calculated as the time difference between the 'STOP' (End of trial) and 'TS-ON' (Trial Start) event markers.",
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"Units": "s"
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},
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"trial_type": {
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"Description": "Categorical type of the trial, indicating the grip and force requirements.",
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"Levels": {
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"SGLF": "Side Grip Low Force trial (Grip first cueing)",
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"SGHF": "Side Grip High Force trial (Grip first cueing)",
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"PGLF": "Precision Grip Low Force trial (Grip first cueing)",
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"PGHF": "Precision Grip High Force trial (Grip first cueing)",
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"LFSG": "Low Force Side Grip trial (Force first cueing)",
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"HFSG": "High Force Side Grip trial (Force first cueing)",
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"LFPG": "Low Force Precision Grip trial (Force first cueing)",
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"HFPG": "High Force Precision Grip trial (Force first cueing)",
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"NONE": "No specific trial type (e.g., aborted or non-task related event)"
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}
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},
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"response_time": {
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"Description": "Time of the subject's response, defined by the 'SR' (table switch released) event marker.",
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"Units": "s",
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"MissingValues": "n/a"
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}
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}

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