Reliability and stability of contingent negative variation

Reliability parameters of a test indicate the stability (and quality) of th e test itself Reliability coefficients greater than 0.70 suggest an attribu te as being sufficiently stable over time to be characterized as a trait. R eliability parameters of contingent negative variation (CNV) amplitudes in 27 healthy individuals were determined using a test-retest design. CNV was recorded at Cz, with an interstimulus interval of 3 s, on 2 separate occasi ons. initial session and 10 days later Correlation coefficients between the 2 recording sessions were 0.675 for the total-CNV (tCNV), 0.855 for the ea rly component(iCNV), 0.631 for the late component (iCNV), and 0.420 for the post-imperative negative variation (PINV). Statistical retest and 0.655 fo r PINV The iCNT, more than the other parameters, remained stable over the p eriod of 10 days. It is suggested that the described standardized CNV recor ding procedure ensures reproducible and stable results in healthy subjects.