[Speech and behavioral contaminations as non-epileptic automatic behavior in Parkinson's disease].

Parkinson's disease is characterized by a variety of motor and non-motor symptoms. More than two hundred years have passed since its description, but we still discover its new manifestations. Abnormal behaviors include impulse control disorders, dopamine dysregulation syndrome, psychotic disorders and others.

[Subjective and objective subtypes of excessive daytime sleepiness in Parkinson's disease].

Background: Excessive daytime sleepiness (DS) is a common symptom of Parkinson's disease (PD), which can occur at any stage of the disease and decrease the quality of life of patients. The relationship between excessive daytime sleepiness and Parkinson's disease is determined by neurodegenerative process in the brain structures. However, there are many other factors, which can contribute to this phenomenon.

[Social cognition impairments in Parkinson's disease].

Parkinson's disease is the second most common neurodegenerative disease of the elderly caused by the neurodegenerative process in different parts of the brain, which resulted in motor and non-motor symptoms. Investigation of non-motor symptoms of Parkinson's disease is increasingly rising for the last years. Social cognition is a special type of cognitive process, which provides people interaction in the society and their impairment also can be observed in Parkinson's disease.

[Social cognitive function in neurodegenerative diseases].

The ability to perceive, analyze people's mental states, intentions, thoughts and feelings is an important cognitive function for normal social behavior and interaction. Over the past decade, more attention has been paid to studying how behavioral disorders in patients with neurodegenerative diseases may be explained by theory of mind deficit and whether it can be useful for differential diagnosis. The authors consider the issues of neuroanatomy, neurophysiology of a special kind of cognitive functions provided normal social interaction and interpersonal relationship, problems of its determining in neurodegenerative diseases.