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  2. Rhythmic movement disorder - Wikipedia

    en.wikipedia.org/wiki/Rhythmic_movement_disorder

    Rhythmic movement disorder. Rhythmic movement disorder (RMD) is a neurological disorder characterized by repetitive movements of large muscle groups immediately before and during sleep often involving the head and neck. It was independently described first in 1905 by Zappert as jactatio capitis nocturna and by Cruchet as rhythmie du sommeil. [1]

  3. Bobble-head doll syndrome - Wikipedia

    en.wikipedia.org/wiki/Bobble-head_doll_syndrome

    Bobble-head doll syndrome is a rare neurological movement disorder in which patients, usually children around age 3, begin to bob their head and shoulders forward and back, or sometimes side-to-side, involuntarily, in a manner reminiscent of a bobblehead doll. The syndrome is related to cystic lesions and swelling of the third ventricle in the ...

  4. Nodding disease - Wikipedia

    en.wikipedia.org/wiki/Nodding_disease

    Nodding disease, also known as nodding syndrome, is a mentally and physically disabling disease that affects children aged 3 and above, continuing into adulthood. [2] It was first described in 1962 in secluded mountainous regions of Tanzania, with sporadic outbreaks in the decades since in South Sudan, Uganda, and again in Sudan with its largest outbreak from 2016 to present.

  5. De Musset's sign - Wikipedia

    en.wikipedia.org/wiki/De_Musset's_sign

    De Musset's sign is a type of head tremor. [1][2] This symptom consists in rhythmic nodding or bobbing of the head in synchrony with the beating of the heart, in general as a result of aortic regurgitation whereby blood from the aorta regurgitates into the left ventricle due to a defect in the aortic valve. [3][4] The nodding is an indication ...

  6. Essential tremor - Wikipedia

    en.wikipedia.org/wiki/Essential_tremor

    Essential tremor (ET), also called benign tremor, familial tremor, and idiopathic tremor, is a medical condition characterized by involuntary rhythmic contractions and relaxations (oscillations or twitching movements) of certain muscle groups in one or more body parts of unknown cause. [6] It is typically symmetrical, and affects the arms ...

  7. Nod (gesture) - Wikipedia

    en.wikipedia.org/wiki/Nod_(gesture)

    Nod (gesture) A depiction of a person nodding. A nod of the head is a gesture in which the head is tilted in alternating up and down arcs along the sagittal plane. In many cultures, it is most commonly, but not universally, used to indicate agreement, acceptance, or acknowledgement.

  8. Body language - Wikipedia

    en.wikipedia.org/wiki/Body_language

    Body language is a major contributor to the attitude a person conveys to others. Albert Mehrabian maintains that during a conversation dealing with feelings and attitudes (i.e., like-dislike), 7% of what is communicated is via what is said, 38% is via tone of voice, and the majority, 55%, is via body language.

  9. Myoclonus - Wikipedia

    en.wikipedia.org/wiki/Myoclonus

    Myoclonus. Myoclonus is a brief, involuntary, irregular (lacking rhythm) twitching of a muscle, a joint, or a group of muscles, different from clonus, which is rhythmic or regular. Myoclonus (myo- "muscle", clonus "spasm") describes a medical sign and, generally, is not a diagnosis of a disease. It belongs to the hyperkinetic movement disorders ...