CEREBROSPINALECTOMY
Friend: "Stop staring at my mother." Me: "Her head is nodding." Friend: "She agrees with you." Me: "She has been agreeing for six minutes." Me: "Through a disagreement." Essential tremor does not stay in the hands. It can sit in the head and neck as a slow yes-yes or no-no oscillation that is there when the head is held up against gravity and gone in sleep. It is not a mood and it is not a message. That is also what separates it from a parkinsonian tremor, which lives in the hands at rest and quiets the moment the hand does something. Send this to whoever cannot stop examining their in-laws. Send this to whoever cannot stop examining other people's families.
EXPLAINED (ACCURACY-CHECKED)
Essential tremor commonly involves the head and neck as a postural 'yes-yes' (vertical) or 'no-no' (horizontal) oscillation that is present with maintained posture and absent during sleep; parkinsonian tremor is characteristically a rest tremor of the hand that diminishes with voluntary movement.
Established movement-disorders phenomenology (Consensus Statement on the classification of tremors, Movement Disorder Society; Bhatia et al. 2018). Head tremor with postural activation is a recognized essential-tremor phenotype; rest tremor with action suppression is characteristic of parkinsonism.
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