Wavelet analysis reveals dynamics of rat oscillatory potentials

Abstract

We characterised the dynamics in the oscillatory potentials (OPs) of the rat electroretinogram (ERG) using a continuous complex Morlet wavelet transform. Dark-adapted (>12 h) full field ERG responses were recorded from five anaesthetized (ketamine:xylazine, 60:5 mg/kg) adult Long-Evans rats (10-12 weeks). Five responses were obtained for brief LED flashes (1-4 ms) in a ganzfeld at exposures ranging from -4.2 to 1.58 log cd s m-2. Signals were recorded across a bandwidth of 0.3-1 kHz and digitized at 10 kHz. Morlet wavelets with frequencies between 50 and 250 Hz were correlated with raw ERG signals at 1 ms intervals. The amplitude of the correlation at each time and frequency was given by the..