👉 Intermediate Oscillatory Rhythms (IOR) are a category of brain wave patterns characterized by oscillations in frequency, typically ranging from 0.8 to 4 Hz, that occur in the electroencephalogram (EEG) recordings of the brain. These rhythms are classified based on their specific frequency bands: IORs are further divided into low-frequency IORs (L-FIRO) at 0.5-0.8 Hz and high-frequency IORs (H-FIRO) at 1-4 Hz. L-FIROs are often associated with deep sleep stages, particularly slow-wave sleep, while H-FIROs are linked to more active states, such as wakefulness, attention, and cognitive processing. This classification helps researchers understand the dynamic interplay between different brain states and their roles in various physiological and psychological processes.
