Topics

Hallucinations, somatic-functional disorders of PD-DLB as expressions of thalamic dysfunction.

08:00 EDT 15th July 2019 | BioPortfolio

Summary of "Hallucinations, somatic-functional disorders of PD-DLB as expressions of thalamic dysfunction."

Hallucinations, delusions, and functional neurological manifestations (conversion and somatic symptom disorders) of Parkinson's disease (PD) and dementia with Lewy bodies increase in frequency with disease progression, predict the onset of cognitive decline, and eventually blend with and are concealed by dementia. These symptoms share the absence of reality constraints and can be considered comparable elements of the PD-dementia with Lewy bodies psychosis. We propose that PD-dementia with Lewy bodies psychotic disorders depend on thalamic dysfunction promoting a theta burst mode and subsequent thalamocortical dysrhythmia with focal cortical coherence to theta electroencephalogram rhythms. This theta electroencephalogram activity, also called fast-theta or pre-alpha, has been shown to predict cognitive decline and fluctuations in Parkinson's disease with dementia and dementia with Lewy bodies. These electroencephalogram alterations are now considered a predictive marker for progression to dementia. The resulting thalamocortical dysrhythmia inhibits the frontal attentional network and favors the decoupling of the default mode network. As the default mode network is involved in integration of self-referential information into conscious perception, unconstrained default mode network activity, as revealed by recent imaging studies, leads to random formation of connections that link strong autobiographical correlates to trivial stimuli, thereby producing hallucinations, delusions, and functional neurological disorders. The thalamocortical dysrhythmia default mode network decoupling hypothesis provides the rationale for the design and testing of novel therapeutic pharmacological and nonpharmacological interventions in the context of PD, PD with dementia, and dementia with Lewy bodies. © 2019 International Parkinson and Movement Disorder Society.

Affiliation

Journal Details

This article was published in the following journal.

Name: Movement disorders : official journal of the Movement Disorder Society
ISSN: 1531-8257
Pages:

Links

DeepDyve research library

PubMed Articles [16054 Associated PubMed Articles listed on BioPortfolio]

Visual hallucinations, thalamocortical physiology and Lewy Body Disease: A Review.

One of the core diagnostic criteria for Dementia with Lewy Bodies (DLB) is the presence of visual hallucinations. The presence of hallucinations, along with fluctuations in the level of arousal and sl...

Effects of thalamic infarction on the structural and functional connectivity of the ipsilesional primary somatosensory cortex.

To identify regions causally influenced by thalamic stroke by measuring white matter integrity, cortical volume, and functional connectivity (FC) among patients with thalamic infarction (TI) and to de...

Transdiagnostic variations in impulsivity and compulsivity in obsessive-compulsive disorder and gambling disorder correlate with effective connectivity in cortical-striatal-thalamic-cortical circuits.

Individual differences in impulsivity and compulsivity is thought to underlie vulnerability to a broad range of disorders and are closely tied to cortical-striatal-thalamic-cortical function. However,...

Screening for depression in cancer patients using the PHQ-9: The accuracy of somatic compared to non-somatic items.

The PHQ-9 is a standard screening tool for depressive disorders in cancer patients. As for the frequently reported symptom overlap with somatic disease, it has been debated whether somatic items are s...

Understanding auditory verbal hallucinations in healthy individuals and individuals with psychiatric disorders.

Auditory verbal hallucinations(AVHs) are psychiatric manifestations that are common in patients with psychiatric disorders and can occur in healthy individuals. This review summarizes the existing lit...

Clinical Trials [8729 Associated Clinical Trials listed on BioPortfolio]

Somatic Symptom and Related Disorders: A Treatment Group and Mixed-Methods Investigation

The purpose of this study is to evaluate the effectiveness of a new cognitive behavioural therapy (CBT) group for individuals with a somatic symptom disorder (i.e., Somatic Symptom and Rel...

Thalamic DBS for Laryngeal Dystonia (Spasmodic Dysphonia)

Laryngeal Dystonia (LD), also commonly referred to as spasmodic dysphonia, is a neurological voice disorder characterized by involuntary dystonic contractions of the laryngeal muscles. Cur...

Symptom Based Treatment Affects Brain Plasticity - the Role of Verbal Auditory Hallucinations

The aim of the study is the examination of brain plasticity on verbal auditory hallucinations (AVH) after neuromodulation with fMRI (functional magnetic resonance imaging) neurofeedback. D...

Rt-fMRI Neurofeedback and AH in Schizophrenia

Auditory hallucinations in schizophrenia are one of the major symptoms of this disease and a major source of psychological discomfort. They are often difficult or impossible to treat with ...

Cognitive Therapy for Distressing Visual Hallucinations: A Pilot Study

The study is a pilot study of Cognitive therapy for people with psychosis who have distressing visual hallucinations. The aim is to evaluate whether this is an acceptable, feasible and eff...

Medical and Biotech [MESH] Definitions

Marked disorders of thought (delusions, hallucinations, or other thought disorder accompanied by disordered affect or behavior), and deterioration from a previous level of functioning. Individuals have one o more of the following symptoms: delusions, hallucinations, and disorganized speech. (from DSM-5)

A subfield of psychiatry that emphasizes the somatic substructure on which mental operations and emotions are based, and the functional or organic disturbances of the central nervous system that give rise to, contribute to, or are associated with mental and emotional disorders. (From Campbell's Psychiatric Dictionary, 8th ed.)

Disorders in which there is a loss of ego boundaries or a gross impairment in reality testing with delusions or prominent hallucinations. (From DSM-IV, 1994)

Repetitive visual hallucinations experienced mostly by elderly with diminished visual acuity or visual field loss, with awareness of the fictional nature of their hallucinations. It is not associated with delusions and other sensory hallucinations.

Disorders of verbal and nonverbal communication caused by receptive or expressive LANGUAGE DISORDERS, cognitive dysfunction (e.g., MENTAL RETARDATION), psychiatric conditions, and HEARING DISORDERS.

Quick Search


DeepDyve research library

Relevant Topics

Parkinson's Disease
Parkinson's is a progressive neurological condition, affecting one person in every 500, 95% of which are over 40. It is caused by degeneration of more than 70% of the substantia nigra, which depletes the dopamine (the neurotransmitter involved in pro...

Alzheimer's Disease
Of all the types of Dementia, Alzheimer's disease is the most common, affecting around 465,000 people in the UK. Neurons in the brain die, becuase  'plaques' and 'tangles' (mis-folded proteins) form in the brain. People with Al...


Searches Linking to this Article