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Extract EDA Features per Channel

Source: R/eda-features.R
edaFeatures.Rd

Computes summary features from electrodermal activity data, including skin conductance response (SCR) statistics and skin conductance level (SCL) measures. Requires tonic/phasic decomposition to have been performed (via edaDecompose).

Usage

edaFeatures(
  x,
  peaks = NULL,
  window = NULL,
  assay_name = NULL,
  ns_scr_amplitude_min = 0.05
)

Arguments

x

A PhysioExperiment object containing EDA data.

peaks

Optional pre-computed peaks data.frame from edaPeaks. If NULL, peaks are computed automatically using the gradient method.

window

Optional numeric vector of length 2 giving the time window in seconds as c(start_sec, end_sec) to restrict analysis.

assay_name

Name of the input assay for peak detection. If NULL, uses defaultAssay(x).

ns_scr_amplitude_min

Minimum SCR amplitude (in uS) to count a peak as a non-specific SCR (default 0.05, the standard threshold).

Value

A data.frame with one row per channel and the following columns:

channel

Character channel label.

scr_count

Integer number of detected SCR peaks.

scr_rate_per_min

Numeric SCR count per minute.

mean_amplitude

Numeric mean SCR peak amplitude in microsiemens (0 if no peaks detected).

mean_scl

Numeric mean tonic skin conductance level.

scl_sd

Numeric standard deviation of the tonic signal.

auc_phasic

Numeric area under the phasic curve (positive values only, in uS*s), or NA if no phasic assay exists.

ns_scr_count

Integer count of non-specific SCRs (amplitude >= ns_scr_amplitude_min).

ns_scr_freq

Numeric non-specific SCR frequency (per minute): ns_scr_count / duration_min.

cda_nscr

Integer number of significant SCRs in the CDA/DDA driver, or NA if no driver assay exists.

cda_ampsum

Numeric sum of the CDA/DDA driver SCR amplitudes (uS), or NA.

cda_iscr

Numeric integrated SCR: time-integral of the phasic driver (uS*s), or NA.

References

Boucsein, W. (2012). Electrodermal Activity. 2nd ed. Springer. doi:10.1007/978-1-4614-1126-0

Benedek, M., & Kaernbach, C. (2010). "A continuous measure of phasic electrodermal activity." Journal of Neuroscience Methods, 190(1), 80-91. doi:10.1016/j.jneumeth.2010.04.028

See also

edaDecompose for tonic/phasic decomposition (run first), edaPeaks for SCR peak detection, edaErscr for event-related SCR analysis