FIRDA is typically seen in which population?

Focal Intermittent Rhythmic Delta Activity (FIRDA) is primarily observed in adults. This EEG pattern is characterized by intermittent bursts of delta waves, usually associated with cerebral dysfunction, such as from focal lesions, degenerative brain diseases, or metabolic disturbances. Adults are more prone to develop conditions that could lead to FIRDA, such as stroke or brain injuries, making this population more susceptible to exhibiting this particular EEG finding.

In contrast, FIRDA is less commonly seen in children, infants, or the elderly for different reasons. Children often demonstrate different EEG patterns that are age-appropriate and typically show more theta and alpha activity rather than the delta activity associated with FIRDA. Infants, whose brains are still maturing, exhibit unique patterns distinct from those appearing in adults. The elderly may show a variety of EEG changes due to age-related processes, but FIRDA is more directly associated with adult pathologies. Thus, adults are the population in which FIRDA is most characteristically recognized.