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

摘要

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 < 0.001) dramatic changes only in the frequency domain of seconds. These observations permit the conclusion that in V1 VSBP reproducible changes in the range of seconds occur in response to light and darkness.