Power spectral analysis of very slow brain potential oscillations in primary visual cortex of freely moving rats during darkness and light

Abstract Previous reports demonstrated the presence of very slow oscillations (frequencies less than 1 Hz ) in primary visual cortex (V1) neurons. In this work the hypothesis that very slow brain potential (VSBP) oscillations in V1 accompany illumination changes was tested. In darkness (0 lux ) , the results revealed the presence of oscillations in the range of seconds, multisecond and minute fluctuations. Continuous light exposure (2000– 2500 lux ) induced statistically significant ( P