During functional mapping, afterdischarges (ADs) are more likely to occur with stimuli greater than what intensity?

During functional mapping, afterdischarges (ADs) are more likely to occur with stimuli greater than 10 mA due to the increased strength of the stimulation leading to a more robust neural response. The threshold for inducing ADs generally correlates with the amount of current applied. Stimuli below this intensity may activate neural tissue without triggering the prolonged excitatory activity characteristic of ADs.

At or above 10 mA, the electrical stimulation is typically intense enough to potentially affect a larger volume of neural tissue and possibly alter the excitability of neurons, which can lead to the phenomenon of afterdischarges. This is crucial for mapping functional areas within the brain, as understanding the conditions that induce these afterdischarges can help medical practitioners avoid areas that could lead to complications or unwanted seizures during neurological procedures.