Definition
There are various terms which refer to specific movement mechanisms that contribute to the differential diagnoses of hyperkinetic disorders.
As defined by Hogan and Sternad, “posture” is a nonzero time period during which bodily movement is minimal. When a movement is called “discrete,” it means that a new posture is assumed without any other postures interrupting the process. “Rhythmic” movements are those that occur in cycles of similar movements. “Repetitive,” “recurrent,” and “reciprocal” movements feature a certain bodily or joint position that occur more than once in a period, but not necessarily in a cyclic manner.
Overflow refers to unwanted movements that occur during a desired movement. It may occur in situations where the individual’s motor intention spreads to either nearby or distant muscles, taking away from the original goal of the movement. Overflow is often associated with dystonic movements and may be due to a poor focusing of muscle activity and inability to suppress unwanted muscle movement. Co-contraction refers to a voluntary movement performed to suppress the involuntary movement, such as forcing one’s wrist toward the body to stop it from involuntarily moving away from the body.
In evaluating these signs and symptoms, one must consider the frequency of repetition, whether or not the movements can be suppressed voluntarily (either by cognitive decisions, restraint, or sensory tricks), the awareness of the affected individual during the movement events, any urges to make the movements, and if the affected individual feels rewarded after having completed the movement. The context of the movement should also be noted; this means that a movement could be triggered in a certain posture, while at rest, during action, or during a specific task. The movement’s quality can also be described in observing whether or not the movement can be categorized as a normal movement by an unaffected individual, or one that is not normally made on a daily basis by unaffected individuals.
Read more about this topic: Overactive
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