Knee-Jerk: Its Cause, Not Reflex

Jaw-Jerk Reflex in Human Subjects

During voluntary jaw clenching, a sharp tap to the menton of the mandible resulted in a transitory silent period (pause) in the electromyographic activity of the masseter and anterior temporalis muscles. Factors that could influence the duration of the silent period were studied, including direction and magnitude of the stimulus applied by the operator, the amount of muscular effort exerted by ...

A study of the knee jerk.

Eliciting knee jerk--a new method of reinforcement.

This study was designed to detect the sensitivity of different methods of eliciting knee jerks and to compare the conventional methods with the newly purposed maneuver. Knee jerk (a deep tendon reflex) was elicited in 123 apparently normal population (77 males and 46 females) with three different methods (1) without applying reinforcement, (2) applying Jendrassik maneuver (strong voluntary cont...

un 2 00 6 The knee - jerk mapping

We claim to give the definitive theory of what we call the ‘kneejerk mapping’, which is the basis for a class of optimization algorithms introduced by Baum, and promoted by Dempster, Laird, and Rubin under the name ‘EM algorithm’. Introduction We give the definitive theory of the knee-jerk mapping, to be defined below. This mapping has been investigated by many people, most notably Baum ([2], [...

Neural mechanisms of the chloralose jerk with special reference to its relationship with the spino-bulbo-spinal reflex.

It is known that animals anesthetized with chloralose exhibit a generalized jerky muscular contraction in response to various stimuli6). Since this contraction is abolished by acute spinal cord transection, it seems that supraspinal structures may be necessary for its development1,6). With electromyographic observations, there is a late response as well as an early reflex which corresponds with...