Tapping Test and the Archimedean Spiral for the Differential Diagnosis of Tremor. Machine Learning Approach

Inclusion Criteria: * Possibility to collaborate in the necessary evaluations. * Follow-up in the specialized consultation of Movement Disorders at the Neurology Service of Hospital Sant Camil-Consorci Sanitari Alt Penedes i Garraf. * Legal capacity to provide informed consent. * Signature of informed consent for study inclusion, either by the participant themselves or by their legal representative. * Participant with criteria from Group 1 or 2: Group 1: * Confirmed diagnosis of tremor due to Parkinson's disease, clinically established, based on the diagnostic criteria of the Movement Disorders Society, and additionally: * Tremor associated with bradykinesia of any duration. * Confirmatory clinical diagnosis of tremor due to Parkinson's disease (stages 1 to 2 of Hoehn and Yahr) by the neurologist responsible for the participant's follow-up. Group 2: * Confirmed diagnosis of essential tremor, based on the criteria of the Movement Disorders Society, and additionally: * Positional tremor plus kinetic and/or resting tremor with follow-up in outpatient neurology consultations for at least 3 years without a change in diagnosis. * Absence of bradykinesia. Exclusion Criteria: * Patients undergoing treatment with antipsychotics or antidepressants. * Patients with Parkinson's disease and dyskinesias. * Patients undergoing treatment with dopaminergic agonists or primidone. * Tremor of such severity that it prevents continuous tracing, at the investigator's discretion. * Cognitive or affective pathology that limits the ability to collaborate with the study procedures. * Participation in another clinical study involving an intervention, procedure, or visit frequency that is incompatible with the present study. * Participants diagnosed with any of the following conditions: Alcoholism of sufficient intensity to influence handwriting or cause neuropathy, at the investigator's discretion. Peripheral neuropathy of any cause. Dystonias. Previous stroke.