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When the right-handed patient tried to solve a Sudoku puzzle, he experienced quick muscular contractions—clonic seizures—of his left arm.

At the 2013 American Epilepsy Society's annual meeting in Washington DC, researchers from the South Texas Comprehensive Epilepsy Center in San Antonio reported that the Brain Sentinel device detected 95% of generalized tonic–clonic seizures.

By the time he was two-and-a-half, Elijah was experiencing more than 50 seizures a day, including generalized tonic–clonic seizures in which the muscles tense and contract and cause convulsions.

These generalized tonic–clonic seizures begin with a loss of consciousness before the convulsions begin.

This is clearly a very significant delay for a potentially life-threatening health issue: tonic clonic seizures can be fatal.