Missing LFP channels

[dervinism]

Why only a subset of LFP channels is available for downloading? Why not all 384 Neuropixels channels are available? Is this issue discussed somewhere in the documentation? Thanks

[jsiegle]

Hi @dervinism, the LFP processing steps are documented on this page: https://allensdk.readthedocs.io/en/latest/visual_coding_neuropixels.html

The LFP NWB files we have released include every 4th channel (40 micron vertical spacing) and every 2nd sample (1.25 kHz sampling rate). We did this because there is a lot of redundancy in the LFP signal on nearby channels, and most LFP analyses only examine frequencies up to 500 Hz.

If you need access to the original files (all 384 channels, 2.5 kHz sampling rate), they are available as part of our AWS Public Dataset: https://registry.opendata.aws/allen-brain-observatory/