elephant-data/dataset-4

REACH-TO-GRASP Data

This dataset is covered by this license: CC BY 4.0

Description

This folder contains in the subfolder 'R2G_slices' the event-related LFP-cutouts from the G-Node GIN repository 'Massively parallel multi-electrode recordings of macaque motor cortex during an instructed delayed reach-to-grasp task' R2G-repository [1].

The dataset is used for ground truth consistency checks of phase-analysis functions like 'Weighted Phase Lag Index' (WPLI) in Elephant [2].

The slicing of this LFP recording was performed by the following steps:

1. data-set i140703-001 was loaded and read with ReachGraspIO provided by [1].
2. got start event 'TS_ON' for all correct trials
3. created the wanted epochs from start event 'TS_ON' to approximately 'GO_ON' with length 2.1 sec
4. performed cut_segment_by_epoch()
5. kept just the data of 3 channels
6. rearranged sliced LFP-data to have the shape (trial x time) and saved it as *.mat file
7. calculated cross-spectrum of channel 1 & 2 and saved it as *.mat file

NOTE: *.mat files can't contain units, there for we provide the units explicitly

The _i140703-001_ch0i_slice_TS_ON_to_GO_ON_correcttrials.mat files contain the LFP-signal-recordings of a single channel, from event TS_ON to approximately GO_ON for all correct trials, with the fields:

• 'lfp_matrix': multi-trial LFP-data with shape (142 (trials) x 2100 (samples); implicit unit: uV)
• 'times': time-vector (1 (aligned trials) x 2100 (time points); implicit unit: msec)
• 'sf': sampling frequency of the recording (1000; implicit unit: Hz)

There is also a _i140703-001_cross_spectrum_of_channel_1_and_2_of_slice_TS_ON_to_GO_ON_corecttrials.mat file containing the cross-spectrum of channel 1 and 2 with the fields:

• 'cross_spectrum_matrix': multi-trial cross-spectrum with shape (142 (trials) x 1051 (cross-spectrum))
• 'frequencies': positive, real-valued frequencies with shape (1 (aligned trials) x 1051 (frequency); implicit unit: Hz)
  
  

References

1. Brochier T, Zehl L, Hao Y, Duret M, Sprenger J, Denker M, Grün S, Riehle A (2017) Massively parallel multi-electrode recordings of macaque motor cortex during an instructed delayed reach-to-grasp task. doi:10.12751/g-node.f83565
2. Denker M, Yegenoglu A, Grün S (2018) Collaborative HPC-enabled workflows on the HBP Collaboratory using the Elephant framework. Neuroinformatics 2018, P19. doi:10.12751/incf.ni2018.0019