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

Figure 1

Computation of the percentage of oscillatory potentials (%OPs) contributing to the ERG response. The DWT scalogram (a) is shown above the broadband ERG (b). Temporal sections of the scalogram that were taken into consideration when calculating the %OPs are outlined by the dotted gray lines in order to ease appreciation of the time-frequency region in question. The DWT descriptors (20b, 40b, 80ops, and 160ops) that were used to compute the %OPs are identified on the scalogram. The inverse DWT (IDWT) reconstructions of the slow (a- and b-waves, indicated by the corresponding letters) and fast (OPs, indicated by corresponding numbers) waves are shown as the black and red traces (panels (c) and (d)), respectively.