The following are some examples: Agnosia Amnesia Aphasia Apraxia Ataxia Auras (eg, visual, olfactory), as occur in seizures, migraines, or encephalitis Bradykinesia Delirium Dementia Dysarthria (eg, due to stroke or cranial nerve palsies) Dysphagia Dystonia Excessive daytime sleepiness Headache Insomnia Involuntary movements (eg, chorea, myoclonus, tics) Memory loss Muscle cramps Muscle stiffness or rigidity (as occurs in Parkinson disease or stiff man syndrome) Numbness or other sensory deficits Obtundation or coma Seizures Snoring Tremor Vertigo Vision loss, blurring, scotomata (as occur with migraines), or diplopia Weakness