The EEG of a child with benign rolandic epilepsy is most likely to show which of the following?

The EEG of a child with benign rolandic epilepsy typically presents with characteristic spikes that are localized to the central region of the brain, particularly the C3 electrode. This pattern is known for its focal nature, often showing unilateral spikes that correspond with the rolandic area, which is associated with motor function in the mouth and face.

In benign rolandic epilepsy, these spikes are often maximal during sleep and can also coincide with brief focal seizures, usually manifesting as facial twitching or difficulty speaking. The age of onset (typically between 3-12 years) and the benign nature of the condition, wherein seizures often resolve on their own, further solidify the association between this type of epilepsy and the specific spike pattern observed in the EEG.

Other patterns, such as occipital spikes or generalized atypical spike and wave forms, are not characteristic of this specific epilepsy type. While 3Hz spike wave activity is seen in generalized epilepsy conditions, it does not apply to benign rolandic epilepsy, which is more localized. Thus, the presence of C3 spikes is the defining feature in the EEG of a child with benign rolandic epilepsy.