Concentric Needle Jitter in 97 Myasthenia Gravis Patients.

To estimate the jitter parameters (single-fiber electromyography) in myasthenia gravis patients mostly by electrical activation in , and muscles using a concentric needle electrode. Between 2009 and 2019, a total of 97 myasthenia gravis patients, 52 male, and mean age 54 years were included. Any abnormal jitter parameter in individual muscles was 90.

Problems in Comparing Jitter Values Obtained with Voluntary Activation and Electrical Stimulation.

Comparing results from jitter studies performed with voluntary and electrical activation is difficult to perform quantitatively, particularly in complex signals as seen in reinnervation. High jitter values in individual spikes in these multispike signals can be missed with both activation methods, which introduces a bias towards more normal values.With voluntary activation, triggering on a spike from an abnormal end-plate in multispike potentials will overestimate individual jitter values and the number of abnormal jitter values.

Time perception and age.

Unlabelled: Our internal clock system is predominantly dopaminergic, but memory is predominantly cholinergic. Here, we examined the common sensibility encapsulated in the statement: "time goes faster as we get older".

Objective: To measure a 2 min time interval, counted mentally in subjects of different age groups.