Alzheimer's patients may develop a type of seizure, called myoclonus, that can range from small muscle twitches to severe, repetitive jerking of one or more limbs. (See also Alzheimer's and Seizures.)

Myoclonic disorders: a practical approach for diagnosis and treatment
Myoclonus is a sudden, brief, involuntary muscle jerk. It is caused by abrupt muscle contraction, in the case of positive myoclonus, or by sudden cessation of ongoing muscular activity, in the case of
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC303696...
Myoclonus (from Wikipedia)
Myoclonus is brief, involuntary twitching of a muscle or a group of muscles. It describes a medical sign and, generally, is not a diagnosis of a disease. The myoclonic twitches are usually caused by s
http://en.wikipedia.org/wiki/Myoclonus
Myoclonus Fact Sheet (from NINDS/NIH)
What is myoclonus? Myoclonus describes a symptom and generally is not a diagnosis of a disease. It refers to sudden, involuntary jerking of a muscle or group of muscles. Myoclonic twitches or jerks
http://www.ninds.nih.gov/disorders/myoclonus/myocl...