Katherine proc spikes - #704
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@resatomo please be the primary reviewer, since you are most familiar with the parallel pipeline for neuropixels. @leoscholl please look over to catch any glaring issues and @ajm2605 it probably would be good if you familiarize yourself with the preproc pipeline! |
| if 'record_headstage' in params and params['record_headstage']: | ||
| sources.append('broadband') | ||
| sources.append('lfp') | ||
| sources.append('ap') |
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Can you make this depend on the drive type?
| n_ch = 0 | ||
| while n_ch < n_channels: | ||
| broadband_chunk = bb_data[n_samples_read:n_samples_read+time_chunksize, n_ch:n_ch+channel_chunksize] | ||
| ap_chunk = precondition.filter_ap(broadband_chunk, samplerate, **filter_kwargs) |
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Just to check. This filter_ap doesn't downsample data, which is different from filter_lfp. Is this okay?
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For spike detection, downsampling is not good and applying bandpass between 300-10000 is good. But for saving ap_data, you need to do bandpass between 300-5000 and downsampling to 10kHz in my understanding from previous meeting. I don't know how to deal with both.
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I talked to @leoscholl a while ago when writing this and we thought it's best to save ap_data with 300-10kHz, sampled at the original 25kHz. The reason is if you're analyzing AP band data, you probably want up to 10kHz and higher sampling rate. The downside is it takes up more storage. Maybe I need to bring it up to the group?
| # Detect spikes below threshold (for extracellular recordings) | ||
| threshold = precondition.calc_spike_threshold(ap_data, high_threshold=False, rms_multiplier=rms_multiplier) | ||
| spike_times, spike_waveforms = precondition.detect_spikes_chunk(ap_data, samplerate, | ||
| threshold, chunksize, above_thresh=False, **detect_kwargs) |
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Did you try +/- threshold? Just using negative threshold may lose some units because waveforms changes depending on electrode positions. https://www.nature.com/articles/nrn3241
| spike_metadata = metadata | ||
| spike_metadata['spike_threshold'] = threshold | ||
| spike_metadata['refractory_violations_removed'] = True | ||
| spike_metadata['spike_pos'] = {chan_number: chan_number for chan_number in range(n_channels)} # channel identity of each unit (here, iunit=ichan) |
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I'm not sure if spike_pos is a good name because the variables you store are not positions.
| times = np.array([]) | ||
| waveforms = np.array([]) | ||
| else: | ||
| times, idx = precondition.filter_spike_times_fast(spike_times[ichan]) |
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I think it's good to save refractory_period in metadata.
| aodata.save_hdf(result_dir, result_filename, spike_metadata, f'drive{idrive}/metadata', append=True) | ||
| if 'neuropixels' in files: | ||
| print(1) |
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I probably forgot to delete this line. Could you delete it?
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Test functions for proc_ap and proc_spikes would be helpful. |
…tion to negative crossings only
3 participants
Preproc pipeline for ecube recordings w/spikes
These steps are wrapped in
proc_ap()andproc_spikes()