Assessing the Contribution of the Oscillatory Potentials to the Genesis of the Photopic ERG with the Discrete Wavelet Transform

Figure 5

(a) A control ERG (black tracing) is shown with the ERG follow-up of patients #16 (blue tracings) and 17 (red tracings), at first visit (12 and 17 years of age, resp.) and at second visit (24 and 19 years of age, resp.). The a-, b-, and i-waves are indicated by their corresponding letters and OP2, OP3, and OP4 by their corresponding numbers. Calibration: horizontal: 50 ms; vertical: as shown to the right of each tracing. (b) Corresponding DWT scalograms and associated %OPs. Descriptors (20b, 40b, 80ops, and 160ops) that were used to compute the %OPs are localized on each scalogram. Note that, in the scalogram corresponding to the 2nd visit of Brother 2 (bottom tracing), the 40b descriptor was identified using the value of the left rectangle (yellow) as the higher energy red rectangle was time-locked to the i-wave.

(a)

(b)