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Assign electrode montage positions

Source: R/eeg-preprocess.R
eegMontage.Rd

Maps channel labels to standard electrode positions from a known montage system (10-20, 10-10, BioSemi64) or from a custom positions data.frame. Sets pos_x, pos_y, pos_z columns in colData for use by interpolation, topographic mapping, and source localization functions.

Usage

eegMontage(
  x,
  system = c("10-20", "10-10", "biosemi64", "custom"),
  positions = NULL
)

Arguments

x

A PhysioExperiment object.

system

Montage system: "10-20" (19 channels), "10-10" (~64 channels), "biosemi64" (64 BioSemi channels), or "custom" (user-provided positions).

positions

For system = "custom", a data.frame with columns label, pos_x, pos_y, pos_z.

Value

A PhysioExperiment object with updated colData containing position columns.

Examples

pe <- make_eeg(n_time = 5000, n_channels = 19, sr = 500)
pe <- eegMontage(pe, system = "10-20")
head(SummarizedExperiment::colData(pe))
#> DataFrame with 6 rows and 5 columns
#>         label        type     pos_x     pos_y     pos_z
#>   <character> <character> <numeric> <numeric> <numeric>
#> 1         Fp1         EEG    -0.309     0.951     0.000
#> 2         Fp2         EEG     0.309     0.951     0.000
#> 3          F7         EEG    -0.809     0.588     0.000
#> 4          F3         EEG    -0.545     0.809     0.225
#> 5          Fz         EEG     0.000     0.891     0.454
#> 6          F4         EEG     0.545     0.809     0.225