Study of EEG and Nasal Stimulus in Olfactory Disorders

Inclusion Criteria: * Subjects over 18 years of age who have given consent for the collection of specified data, including medical history and personal information, for the purposes of project implementation and in accordance with the ethical standards of the institutions where the project will be conducted. Exclusion Criteria: * Previous fractures of the facial bones, particularly the ethmoid bone. * Active tumors of the brain or face, including tumors of the nose, paranasal sinuses, oral cavity, or nasopharynx. * Active nasal-sinus conditions, particularly radiologically proven sinusitis. * Mass in the pontocerebellar angle, especially schwannoma of the VIII nerve. * Patients with acute and chronic inflammatory diseases of the middle ear, otosclerosis, inner ear diseases (especially Meniere's disease), objective tinnitus, and tinnitus caused by middle ear pathologies and CPA tumors. * Neurodegenerative diseases (especially Alzheimer's and Parkinson's disease). * Known history of neuropsychiatric or cerebral disorders. * Use of psychotropic drugs or drugs active on the central nervous system. * Alcohol and drug abuse.