# Plotting topographical maps

**URL:** <https://mne.discourse.group/t/plotting-topographical-maps/6196>\
**Category:** Support & Discussions\
**Tags:** eeg, visualization\
**Created:** [January 14, 2023, 8:18am UTC](https://mne.discourse.group/t/plotting-topographical-maps/6196 "2023-01-14T08:18:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BilalKhan](https://avatars.discourse-cdn.com/v4/letter/b/e36b37/32.png) [@BilalKhan](https://mne.discourse.group/u/BilalKhan)\
**Post date:** [January 14, 2023, 8:19am UTC](https://mne.discourse.group/t/plotting-topographical-maps/6196/1 "2023-01-14T08:19:00Z")

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Dear MNE comm,

I have a raw eeg timeseries data and I want to plot topographical maps of change in power for every 5 second change to see how the power changes over time. I was wondering if there is a specific function/command for this.

- MNE version: 0.24.0
- EEG system: mBrainTrain smarting Mobi with 24 EEG electrodes and 2 miscellaneous ones (M1, M2)
- operating system: Windows 10

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**Author:** ![drammock](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/drammock/32/4_2.png) [@drammock](https://mne.discourse.group/u/drammock)\
**Post date:** [January 17, 2023, 9:13pm UTC](https://mne.discourse.group/t/plotting-topographical-maps/6196/2 "2023-01-17T21:13:22Z")

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this function can do topomaps and has a `times` argument where you can pass in the times that you want to plot, as well as an `average` argument to set the length of the window around each time that you want to average together when calculating power. [mne.viz.plot\_evoked\_topomap — MNE 1.3.0 documentation](https://mne.tools/stable/generated/mne.viz.plot_evoked_topomap.html)

However it’s designed for `Evoked` data not Raw data. For Raw data you would need to extract each window you want a topomap for, then use `raw_chunk.compute_psd().plot_topomap()`. You could also try “hacking” the raw data into an Evoked object using `EvokedArray`, then using the `plot_evoked_topomap` function.