For further details, the reader is being referred to the numerous recent reviews on the topics such as refs. The following sections will give an overview. There is, however, significant fundamental knowledge of brain physiology and anatomy responsible for fear and anxiety formation. In patients with synucleinopathies, the underlying pathophysiology of anxiety disorders remains poorly understood. In summary, it is apparent that anxiety is not a bystander symptom in these disorders but reflects early pathogenic mechanisms in the cortico-limbic system which may even contribute as a driver to disease progression.Īnxiety is a common human emotional experience with the potential to negatively impact the quality of life. We offer insights into anxiety and fear circuitry in animal models and the current implications for therapeutic intervention. Here, we provide an overview of studies that address neuropsychiatric symptoms in synucleinopathies. Therefore, understanding the progression, extent, and specifics of pathology in the anxiety and fear circuitry in synucleinopathies will suggest novel approaches to the diagnosis and treatment of neuropsychiatric symptoms. Studies in animal models reported αSyn pathology in the amygdala together with alteration of anxiety or fear learning response. In patients with PD, neuropathology in the amygdala, a central region in the anxiety and fear circuitry, may contribute to the high prevalence of anxiety. Anxiety is defined as a neuropsychiatric complication with characteristics such as nervousness, loss of concentration, and sweating due to the anticipation of impending danger. Anxiety is among the most frequent non-motor symptoms in patients with PD, but it remains underrecognized and undertreated, which significantly reduces the quality of life for patients. αSyn-related pathology plays a critical role in the pathogenesis of synucleinopathies leading to the progressive loss of neuronal populations in specific brain regions and the development of motor and non-motor symptoms. Synucleinopathies are neurodegenerative disorders characterized by alpha-synuclein (αSyn) accumulation in neurons or glial cells, including Parkinson’s disease (PD), dementia with Lewy bodies (DLB), and multiple system atrophy (MSA).

How many neurons in a monkey brain