NIMH MEG Core Facility Empty Room Recordings

Empty Room Recordings

We periodically make recordings with nobody in the MSR, as a way to monitor background noise levels. The datasets are made available here. The Download link points to a compressed tarball of the dataset. The topo plots show the RMS values for the entire run, using a 150 Hz bandwidth (click to enlarge). Notch filters at 60 Hz and 120 Hz are also applied. One channel, MRC15, is often noisier than the others, so the second topo plot shows the RMS values after applying a 2 Hz high-pass filter. A list of the top RMS values (fT) along with the corresponding channel names is also shown.

The Python script that generates the topo plots is here: RMStopo.py. You will also need pyctf, located here: Dataset and Task Utilities.

Download link	Top Channels	Top Channels
MEG_EmptyRoom_20260908_001 Length: 100.0 s Sample rate: 4800.0 Hz	MLO53 462.6 MLO33 416.8 MLO43 411.6 MLO52 408.4	MRC54 70.8 MRF11 67.6 MRT41 66.8 MRO12 64.7
MEG_EmptyRoom_20260905_001 Length: 100.0 s Sample rate: 4800.0 Hz	MLF23 202.6 MLO43 197.9 MLO53 186.3 MLO44 184.4	MRO12 68.9 MLO53 67.7 MRC54 66.8 MRT41 66.5
MEG_EmptyRoom_20260902_002 Length: 100.0 s Sample rate: 4800.0 Hz	MLO41 152643.0 MRO41 150023.3 MLF51 140851.3 MRO31 134252.7	MLO41 4662.9 MRO41 4622.4 MLF51 4325.5 MRO31 4092.4
MEG_EmptyRoom_20260902_001 Length: 100.0 s Sample rate: 4800.0 Hz	MLO53 190.3 MLT57 169.1 MLO33 169.0 MLT47 168.1	MRO12 67.0 MRC54 66.8 MRT41 65.5 MLO53 63.5
MEG_EmptyRoom_20260901_001 Length: 100.0 s Sample rate: 4800.0 Hz	MRC15 2227.0 MLC32 1616.2 MRC22 858.7 MRF62 817.9	MRC54 77.5 MRF11 74.6 MRT55 71.5 MRT52 71.2
MEG_EmptyRoom_20260826_001 Length: 100.0 s Sample rate: 4800.0 Hz	MRT56 115.4 MLT46 103.4 MLT56 97.2 MLT55 93.4	MRO12 68.2 MRC54 68.2 MRT41 64.2 MRT31 63.1
MEG_EmptyRoom_20260823_001 Length: 100.0 s Sample rate: 4800.0 Hz	MLT57 378.9 MLO44 355.2 MLT56 325.5 MLO53 316.9	MRT45 190.0 MRC54 69.7 MRO12 67.3 MRT41 63.3
MEG_EmptyRoom_20260821_001 Length: 100.0 s Sample rate: 4800.0 Hz	MLO53 535.2 MLT57 497.4 MLO44 473.3 MLO24 421.2	MRT45 176.6 MLO53 79.9 MRC54 77.7 MLO43 71.2
MEG-HRSquiet_EmptyRoom_20260820_004 Length: 100.0 s Sample rate: 4800.0 Hz	MRC15 2691.7 MLC32 1971.3 MRC22 1025.3 MRF62 993.0	MRC54 71.8 MRO12 65.4 MRT41 63.9 MRT31 62.3
MEG_EmptyRoom_20260820_003 Length: 100.0 s Sample rate: 4800.0 Hz	MRC15 2076.2 MLC32 1630.4 MLP44 748.3 MRF62 744.5	MRC54 71.5 MLO53 64.0 MRT41 64.0 MRT31 62.6