BSSS is one of the most common benign variants with a broad range of prevalence ranging from 1.85% up to 24% of scalp EEG recordings. The appearance of stereotyped, isolated, small-amplitude spikes that do not disrupt the background and appear only in drowsiness or light sleep strongly suggests that the transient may be SSS. They almost exclusively occur during drowsiness or light non-REM sleep. BSSS often appear in both hemispheres either independently or bisynchronously and may have shifting asymmetries. However, SSS may occasionally be accompanied by an after-going slow-wave, and this slow-wave usually has a smaller amplitude relative to the spike.īSSS occur in the broad temporal region and are characteristically difficult to localize precisely. The identifying features of BSSS include their typically widespread horizontal dipole distribution that occurs in the absence of any apparent disruption of the ongoing background activities. Benign sporadic sleep spikes (BSSS), also referred to as small sharp spikes or benign epileptiform transient of sleep (BETS), are low amplitude (<50 mV), brief (<50 ms), sharply contoured monophasic or biphasic electronegative spikes in theta or alpha frequency range (see figure 1).
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