Plot EEG Topographic Map — eegPlotTopomap • PhysioEEG

Creates a 2D scalp topographic map using inverse distance weighted interpolation. Electrode positions are read from colData(x) (columns pos_x, pos_y) or default 10-20 positions are used as fallback. The plot includes a head outline, nose, and ears.

Usage

eegPlotTopomap(
  x,
  time = NULL,
  values = NULL,
  assay_name = NULL,
  resolution = 100,
  palette = "RdBu",
  contours = TRUE,
  electrodes = TRUE
)

Arguments

x: A PhysioExperiment object with EEG data.
time: Numeric time point in seconds at which to extract values from the assay. If NULL and values is also NULL, the mean across all time points is used.
values: Named numeric vector of channel values to plot directly. If provided, overrides data extraction from the assay.
assay_name: Input assay name. If NULL, uses the default assay.
resolution: Integer grid resolution for interpolation (default: 100).
palette: Character name of the diverging color palette (default: "RdBu").
contours: Logical; if TRUE, add contour lines.
electrodes: Logical; if TRUE, show electrode positions as points.

Value

A ggplot2 object.

Examples

if (FALSE) { # \dontrun{
pe <- make_eeg(n_time = 500, n_channels = 19, sr = 250)
eegPlotTopomap(pe, time = 0.5)
} # }