Advance in ERG Analysis: From Peak Time and Amplitude to Frequency, Power, and Energy
Table 1
Normative data (mean ± standard deviation (SD) and coefficient of variation (CV, in bold)) obtained for each parameter (time, frequency, amplitude, power, and energy) assessed using the different analytical approaches compared in this study (time domain, frequency domain, and continuous and discrete time-frequency domain). The time domain allows timing and amplitude quantification of two major components (i.e., the a- and b-waves). The frequency domain identifies the frequency and power of three major components (probably associated with the a- and b-waves and OPs). The continuous time-frequency domain allows timing, frequency, and energy measurements of three main components (probably associated with the a- and b-waves and OPs). Finally, with the discrete time-frequency domain, the components are identified in predetermined temporal windows (i.e., intervals) and frequency bands (i.e., instead of precise timing and frequency) and allow more components to be identified and the a- and b-wave can be quantified independently (i.e., in contrast to the frequency domain or continuous time-frequency domain in which the a- and b-waves formed a single low-frequency component).
