Calculate an interpolated scalpmap — get

Calculate and return an interpolated scalpmap from a data.frame or eeg_epochs object. This provides the basis for a raster plot, as used to create topographical plots.

get_scalpmap(data, ...)

# S3 method for class 'data.frame'
get_scalpmap(
  data,
  method = "biharmonic",
  grid_res = 100,
  interp_limit = "skirt",
  quantity = "amplitude",
  facets = NULL,
  r = 95,
  k = -1,
  ...
)

# S3 method for class 'eeg_epochs'
get_scalpmap(
  data,
  method = "biharmonic",
  grid_res = 100,
  interp_limit = "skirt",
  quantity = "amplitude",
  facets = NULL,
  r = 95,
  ...
)

Arguments

data: An object of class 'data.frame`
...: Other arguments
method: "biharmonic" or "gam" smooth
grid_res: Grid resolution
interp_limit: Interpolate up to the "head" or add a "skirt"
quantity: Quantity to be plotted. Defaults to "amplitude".
facets: Any facets you plan to use
r: Size of headshape
k: Degrees of freedom used for spline when using method = gam. Defaults to -1, which attempts to automatically determine k.

Value

A tibble with the columns x, y, fill

Methods (by class)

get_scalpmap(data.frame): Get scalpmap from a data.frame
get_scalpmap(eeg_epochs): Get scalpmap from an eeg_epochs object.

Examples

head(get_scalpmap(demo_epochs))
#> Joining with `by = join_by(electrode)`
#> # A tibble: 6 × 3
#>       x     y  fill
#>   <dbl> <dbl> <dbl>
#> 1 -113. -9.60  5.77
#> 2 -113. -5.76  5.54
#> 3 -113. -1.92  5.33
#> 4 -113.  1.92  5.14
#> 5 -113.  5.76  4.96
#> 6 -113.  9.60  4.81