Abnormal costs arise because of any abnormal activity or event not part of routine business operations.

Typically, up to three episodes of abnormal activity can be stored, with the most recent episode replacing the oldest.

Examples include muscle contractions due to abnormal nerve stimulation, or abnormal activity of the muscle itself.

Ripples have been used to describe both abnormal activity associated with epileptiform sharp waves and normal behaviors such as physiological sharp waves and memory consolidation.

Their goal was to evaluate the ability of their network to effectively report on abnormal activity within neighborhoods.