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Electrodermal sympathetic index (EDASymp)

Source: R/eda-sympathetic.R
edaSympatheticIndex.Rd

Spectral power of the electrodermal signal in the sympathetic band (0.045-0.25 Hz by default), following Posada-Quintero et al. (2016). The signal is optionally downsampled, its Welch power spectral density is estimated, and the band power is reported both in absolute units and normalised by the total spectral power.

Usage

edaSympatheticIndex(
  x,
  band = c(0.045, 0.25),
  assay_name = NULL,
  resample_hz = 2,
  seg_sec = NULL
)

Arguments

x

A PhysioExperiment object with an electrodermal assay.

band

Numeric c(low, high) sympathetic band in Hz (default c(0.045, 0.25)).

assay_name

Input assay (default: defaultAssay(x)).

resample_hz

Rate (Hz) the signal is downsampled to before spectral estimation (default 2; NULL keeps the native rate). Ignored if it is not below the native sampling rate.

seg_sec

Welch segment length in seconds (NULL = one whole-signal Hann window).

Value

A data frame with one row per channel: channel, edasymp (absolute band power), edasymp_norm (band power / total power, in [0, 1], or NA for a constant / zero-power channel), total_power, and the band_low/band_high used.

References

Posada-Quintero, H.F. et al. (2016). Power spectral density analysis of electrodermal activity for sympathetic function assessment. Ann Biomed Eng 44(10):3124-3135.

See also

edaTVSymp()

Examples

pe <- edaSimulate(n_time = 1200, sr = 4, scr_count = 6, seed = 1)
edaSympatheticIndex(pe)
#>   channel     edasymp edasymp_norm total_power band_low band_high
#> 1       1 0.006002253    0.1195644  0.05020099    0.045      0.25