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FieldTrip Import ​

This demo demonstrates importing FieldTrip .mat files into EegFun.jl. FieldTrip is a MATLAB toolbox for EEG/MEG analysis, and its structures are a common way to exchange processed data.

About FieldTrip .mat Format ​

FieldTrip stores data in MATLAB structures (generic .mat files). EegFun.jl uses MAT.jl to parse them and map them onto EegFun types.

Key features:

  • Supports raw, epoched, and averaged (timelock) data

Import Capabilities ​

Data loading:

  • Import of continuous raw data

  • Import of segmented epochs data

  • Import of averaged timelock (ERP) data

Data Mapping ​

EegFun.read_fieldtrip maps MATLAB structures to EegFun:

  • FieldTrip raw / epochs → ContinuousData / EpochData

  • FieldTrip timelock → ErpData

  • Sample rates and time axes are automatically reconstructed

Workflow Summary ​

  1. Load Layout: Load a layout file and prepare it for plotting.

  2. Import Data: Use read_fieldtrip() providing the path and the layout.

  3. Validation: Visualize the imported structures using plot_databrowser() for continuous/epoched data or plot_erp() for averaged data.

Code Examples ​

Show Code
julia
# FieldTrip Import Demo
#
# Demonstrates loading FieldTrip .mat files

using EegFun
# Note: EegFun.example_path() resolves bundled example data paths.
# When using your own data, simply pass the file path directly, e.g.:
# dat = EegFun.read_fieldtrip("/path/to/your/data.mat", layout)

# Load layout (FieldTrip doesn't store layout with data)
layout = EegFun.read_layout(EegFun.example_path("layouts/biosemi/biosemi72.csv"))
EegFun.polar_to_cartesian_xy!(layout)

# Load continuous data
println("Loading continuous data...")
continuous_data = EegFun.read_fieldtrip(EegFun.example_path("data/fieldtrip/continuous.mat"), layout)
EegFun.trigger_count(continuous_data)
EegFun.plot_databrowser(continuous_data)

# Load epoched data  
println("\nLoading epoched data...")
epoch_data = EegFun.read_fieldtrip(EegFun.example_path("data/fieldtrip/epochs.mat"), layout)
EegFun.plot_databrowser(epoch_data)

# Load ERP data
println("\nLoading ERP data...")
erp_data = EegFun.read_fieldtrip(EegFun.example_path("data/fieldtrip/erp.mat"), layout)

# Biologische Psychologie Labor Tübingen Custom mat files
# Essentially slightly stripped down FieldTrip structures
println("\nLoading ERP data...")
epoch_data = EegFun.read_fieldtrip(EegFun.example_path("data/fieldtrip/custom_epochs.mat"), layout)

# Load ERP data
println("\nLoading ERP data...")
erp_data = EegFun.read_fieldtrip(EegFun.example_path("data/fieldtrip/custom_erp.mat"), layout)
EegFun.plot_erp(erp_data, layout = :grid)

See Also ​