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Essence of Materia Medica – page 200

Arsenicum restlessness arises from the mental/emotional plane, and it never has the excessive energy of Tarentula; it is an anxious anguished restlessness which only secondarily causes the characteristic restless changing of positions. Veratrum is also very hyperactive, but from an overactive mind. In Tarentula, the restlessness arises out of a need to release extreme nervous energy, which results in anxiety and activity of the mind as secondary effects to the disturbance in the nervous system itself.
The Tarentula activity is always very fast. Everything must be done with the greatest speed. He is even impatient with slowness in other people; if someone is walking slowly on the street, the Tarentula patient may become angry and urge the person to move along more quickly. On his way home, the Tarentula patient may walk faster and faster, until finally he is actually running the last leg. This arises not so much out of a sense of anti¬cipation but out of a compulsion for sheer rapid motion.
Because of the wound-up state of the nervous system, the Tarentula patient is relieved by rhythmic activities and influences. Particularly striking is the soothing and calming influence of the rhythmic vibrations of music. Rhythym seems to channel and release the tension, thereby calming and quieting the nervous system. This is a different mechanism from the improvement from music seen in Aurum, which soothes more directly the mental level, or in Natrum mur. in which music produces a relaxing harmonious environment. Of course, the wrong type of music, par¬ticularly at a time when the Tarentula patient is under great pressure, can also trigger off and aggravate the wound-up state. The need for rhythm is the reason for the tendency of Tarentula patients to dance, to jump, and to run; and these movements are not merely gentle and slow. Tarentula patients are driven to wild, frenzied, rapid and vigorous movements. At the same time, however, the movements are graceful, rhythmic and flowing; thus Tareniual is a prime remedy to consider in choreas, such as St. Vitus’ Dance of Huntington’s Chorea.
Such a wound-up nervous system is not surprisingly affected by external pressures and influences. As mentioned, music of the wrong type may aggravate the condition. For the same reasons, Tarentula patients are markedly aggravated by touch. A striking feature is aggravation from bright or strong colours—red, yellow,