# Developing an Assisting Device to Reduce the Vibration on the Hands of Elders
## 2 Research Facility on the Parkinsonian Tremor  
When studying tremors in general, tremors are evaluated from the time of their appearance and characterized by where they originate from within the patient's body. To diagnose a patient, the physician considers different observations to identify the nature of the tremor. Based on the tremor's reaction when the muscle is at rest or constricted, certain tremors' natural frequency and amplitude can be categorized by their root cause. There are two primary classifications of tremor [26]: Parkinsonian tremor and action tremor. A Parkinsonian tremor is diagnosed when individuals do not intentionally stimulate the appendage in question, however the body part continues to tremor regardless. An action tremor is therefore defined as occurring during the voluntary or deliberate movement by individuals of a muscle or appendage. Generally, most tremor types are classified as action tremors, which can be further separated into the tremor sub-categories shown in Table 1. \begin{table}
\begin{tabular}{p{14.2 pt} p{142.3 pt} p{142.3 pt} p{142.3 pt}} \hline \hline
**Main Category** & **Child Category** & **Description** & **Author(s)** & **Finding(s)** \\ \hline \multirow{4}{*}{1. Action tremor} & \multirow{4}{*}{1.1 Cerebellar tremor} & Causes agitation at the ends of extremities and is initiated by damage to the cerebellum pathways to other regions of the brain. & [PERSON] and [PERSON], [PERSON] [27] & Via the available data, the clinical phenomenology of tremors of cerebellar origin is heterogeneous, although intention tremor is the sole signature of cerebellar lesions is an over-simplification. \\ \cline{3-4}  & & & There are two forms of tremor in dystonia: dystonic tremors produced by dystonic muscle & The neurologic examination shows a postural and tremor of both hands in medium (4 to 8 Hz) from a 62-year-old slowly and and and progressed gradually. \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \hline \multirow{4}{*}{1.3 Essential tremor} & This is one of the most frequent movement disorders. It affects the hand and can expand to the head. The shaking frequency will often decay with age, but the severity or magnitude of the tremor might increase. & [PERSON] et al. [29] & The neurologic examination shows a postural and tremor of both hands in medium (4 to 8 Hz) from a 62-year-old woman. The tremor started slowly and symmetrically and progressed gradually. \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \cline{3-4}  & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Review of the clinical investigation of various kinds of tremors. Tremors can be characterized by their appearance and where they come from within the body. When a doctor diagnoses someone, they might consider that there are different reasons to identify the nature of a tremor. The core component comprises whether the tremor actively occurs when the human muscle is at rest or not. Likewise, the location of the tremor is also an important factor if it is mirrored on both sides of our body. It is crucial to acknowledge that the tremor manifestations might be similar, but that they are particularized by their root causes. In our work, we focused on Parkinsonian tremors, which can affect other parts of the body from the pill-rolling action of the hand. This resembles a circular movement of rolling small objects, for instance, pills, in the hand. Therefore, our idea was to investigate natural hand tremors and develop a wearable device to suppress involuntary hand tremor. The rest of our paper is organized as follows. In Section 2, we mainly describe how we addressed the most typical features of [PERSON]'s patients, for example, frequency range, in order to detach the Parkinsonian tremor from other actions by utilizing a filtering algorithm.