Welcome to the NeuroAnalyzer website

This is a home of NeuroAnalyzer.jl documentation and tutorials.

NeuroAnalyzer is a Julia toolbox for analyzing neurophysiological data. Currently it allows importing, editing, processing and analyzing EEG, MEP and NIRS data. Preliminary functionality is also available for EDA, ECoG, SEEG and iEEG recordings. Future versions will also support MEG recordings and source localization techniques.

Various methods for modeling non-invasive brain stimulation protocols (tDCS/tACS/tRNS/tPCS/TMS/TUS/INS) will also be implemented (NeuroStim submodule). Another submodule, NeuroTester, will allow designing and running psychological studies. Certain neurophysiological data can be recorded using NeuroRecorder submodule.

NeuroAnalyzer contains a set of separate (high- and low-level) functions. Some interactive graphical user interface (GUI) functions are also available. NeuroAnalyzer functions can be combined into an analysis pipeline, i.e. a Julia script containing all steps of your analysis. This, combined with processing power of Julia language and easiness of distributing calculations across computing cluster, will make NeuroAnalyzer particularly useful for processing large amounts of neurophysiological data.

NeuroAnalyzer is a collaborative, non-commercial project, developed for researchers in psychiatry, neurology and neuroscience.

NeuroAnalyzer repository is located at Codeberg AdamWysokinski/NeuroAnalyzer.jl and mirrored at Github JuliaHealth/Neuroanalyzer.jl.

License

This software is licensed under The 2-Clause BSD License.

How to cite

DOIs for specific version numbers are provided by Zenodo. To cite the current version, use:

@software{adam_wysokinski_7372648,
  author       = {Adam Wysokiński},
  title        = {NeuroAnalyzer},
  year         = 2024,
  publisher    = {Zenodo},
  version      = {0.24.5},
  doi          = {10.5281/zenodo.7372648},
  url          = {https://doi.org/10.5281/zenodo.7372648}
}

Version numbers are: 0.yy.m (yy: last two digits of the year, m: number of the month). Stable versions are released at the beginning of the month indicated in the version number.

What you can do with NeuroAnalyzer

Currently NeuroAnalyzer is focused on resting-state analysis. Some ERP functions are already available, while other type of analyses will be developed in future versions. The goal is to make a powerful, expandable and flexible environment for processing neurophysiological data.

  1. Load neurophysiological recordings:
  2. Edit:
  3. Process:
  4. Analyze:
  5. Plot:

All computations are performed using the double-precision 64-bit floating point format. NeuroAnalyzer data is stored using standard Julia Array and can be easily exported as DataFrame. Thus, external processing of those data using Julia packages is readily available.

NeuroAnalyzer also includes NeuroRecorder, a set of functions for recording various neurophysiological signals:

Why Julia?

There are many excellent MATLAB and Python based EEG/MEG/NIRS software (e.g. EEGLAB, Fieldtrip, Brainstorm, MNE). They have been developed for many years and are well established in the scientific community. Many state-of-the-art papers were published using data prepared using these programs.

However, compared with Python and MATLAB, there are many advantages of Julia, which underlie my decision to start developing such a toolbox in Julia.

I believe that Julia is the future of scientific computing and scientific data analysis. Major advantages of Julia are listed in Julia documentation.

  1. Julia is fast. In many situations Julia is considerably faster than Python (without having to use numba/cython) and MATLAB. Moreover, Julia provides unlimited scalability. Julia programs can easily be ran on a large cluster or across distributed computers.
  2. Julia is open-source and free. Increasing MATLAB licensing costs are prohibitive to individual researchers and many research institutions.
  3. From its very beginning Julia is being focused on scientific computations. Currently only Julia, C, C++ and Fortran belong to the HPC (High Performance Computing) Petaflop Club. Julia is designed for distributed and parallel computations, making it great for distributed analyzes of large data sets.
  4. Most of the Julia packages are written in pure Julia. It’s easier to understand and modify their code if you already know Julia.
  5. Julia is beautifully designed, making programming in Julia a pure pleasure. This elegant design makes Julia easy to read and write.

Benchmarks against MNE and EEGLAB are available here.

What’s new

Changelog and commit details are here.

What’s next

This roadmap of the future developments of NeuroAnalyzer is neither complete, nor in any particular order. You are encouraged to add new functions required for your study. You may also submit a feature request using Codeberg NeuroAnalyzer.jl repository page.

Hardware and software requirements

See https://neuroanalyzer.org/requirements.html for more details.

Documentation

Documentation is available in the following formats:

Known bugs

List of know, reported and fixed bugs is here.

Tutorials

If you are new to Julia, please take a look at some resources for Getting Started with Julia.

Quickstart: add NeuroAnalyzer from the Pkg REPL: pkg> add NeuroAnalyzer.

In Julia REPL, each NeuroAnalyzer function documentation is available via ?<function_name>, e.g. ?plot_psd. Since some funtion names are exported by other packages (e.g. filter is exported by the Base Julia package, while plots by the Plots package), their use must be qualified: NeuroAnalyzer.filter().

Glossary of terms specific for NeuroAnalyzer is here.

  1. Using NeuroAnalyzer
    1. Download and installation
    2. Generating and using sysimage
    3. General remarks
    4. Preferences
    5. Plugins
  2. Load data and electrode positions
    1. Load/save/import/export data
    2. Load/edit/preview electrode positions
  3. Edit
    1. Edit (1): copy, view/edit meta-data, view properties/history
    2. Edit (2): edit channels/epochs, using markers
    3. Edit (3): bad channels/epochs: detect/trim signal/remove bad epochs/interpolate channels
    4. Edit (4): resample, virtual channels, band frequencies, picks, clusters, applying formula
  4. Process
    1. Process (1): reference (common/averaged/auricular/mastoid/Laplacian/custom montage)
    2. Process (2): filtering (FIR/IIR/Remez/moving average/moving median/polynomial/convolution)
    3. Process (3): demean, normalize, taper, convolution, PCA
    4. Process (4): remove electrode pops
    5. Process (5): ICA decomposition/reconstruction
    6. Process (6): interpolate bad channels
  5. Analyze
    1. Analyze (1): components
    2. Analyze (2)
    3. Analyze (3): segments
    4. Analyze (4): coherence
  6. Plot
    1. Plot (1): plot multi-/single-channel signal, compare two signals
    2. Plot (2): plot frequency analysis (PSD: single-/multi-channel, Welch’s periodogram/multi-tapered/Morlet wavelet, 2d/3d)
    3. Plot (3): plot spectrogram (single-/multi-channel, regular/STFT/Morelet wavelet)
    4. Plot (4): complex/tiled plots
    5. Plot (5): filter response
    6. Plot (6): band powers
    7. Plot (7): auto/cross-correlation/covariance
    8. Plot (8): topographical maps
    9. Plot (9): interactive preview and edit
  7. Statistic
    1. Statistics (1): bootstrapping
  8. Misc
    1. Pipelines
    2. Study
    3. Calculate and plot PSD slope
    4. Stationarity
    5. Remove power line noise
    6. Animate
    7. HRV
    8. MEPs
  9. ERPs
  10. NIRS
  11. ECoG
  12. NeuroRecorder

Plugins

The list of available plugins is here.

Please let us know if you would like to add your plugin to the list.

Support

Every contribution (bug reports, fixes, new ideas, feature requests or additions, documentation improvements, etc.) to the project is highly welcomed.

Bugs, suggestions and questions should be reported using the Codeberg AdamWysokinski/NeuroAnalyzer.jl (preferred method) or Github JuliaHealth/NeuroAnalyzer.jl issues page.

You may also follow NeuroAnalyzer on Mastodon.

NeuroAnalyzer forum is located here.

Mailing list

Only people who are subscribed to the discussion list will be able to receive and post messages.

To subscribe to the NeuroAnalyzer mailing list, please send an empty email to neuroanalyzer-list-subscribe@neuroanalyzer.org or register here. To unsubscribe, send an empty email to neuroanalyzer-list-unsubscribe@neuroanalyzer.org or use the form here.

To send a message to the list, send an email to neuroanalyzer-list@neuroanalyzer.org. All messages are moderated for appropriateness. Messages that are not be related to NeuroAnalyzer/EEG/MEG/NIRS/NIBS, contain commercial advertisements or personal attacks and messages with attachments will be withhold from the list.

Mailing list archive is located here.

NeuroAnalyzer Discord forum is located here.

List of publications using NeuroAnalyzer

  1. Wysokiński A, Szczepocka E, Szczakowska A. Improved cognitive performance, increased theta, alpha, beta and decreased delta powers after cognitive rehabilitation augmented with tDCS in a patient with post-COVID-19 cognitive impairment (brain-fog). Psychiatry Research Case Reports. 2023 DOI: 10.1016/j.psycr.2023.100164
  2. Sochal M. et al. The relationship between sleep quality measured by polysomnography and selected neurotrophic factors. Journal of Clinical Medicine. 2024 DOI: 10.3390/jcm13030893

If you have used NeuroAnalyzer in your research, you are kindly asked to report the reference to your paper.

Financial support

If you would like to support the project financially, we have the Liberapay account: Donate using Liberapay

This website is maintained by Adam Wysokiński ORCID

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