Depersonalisation/derealisation disorder (DPD) is a dissociative disorder that affects 1-2% of the population. However, it often takes an average of 7-12 years to receive an accurate diagnosis. This delay can be attributed to the lack of understanding and awareness surrounding DPD. To address this issue, a systematic review was conducted by Abbas Salami, Javier Andreu-Perez, and Helge Gillmeister. The focus was on exploring the neural correlates of core DPD symptoms using electrophysiological techniques. The research covered publications from 1992 to 2020 and aimed to assess the diagnostic potential of these neuroimaging tools. The review delved into various aspects of brain electrical activity related to DPD, including the EEG power spectrum, components of event-related potentials (ERPs), as well as vestibular and heartbeat evoked potentials. These were identified as potential electrophysiological biomarkers for studying DPD symptoms. The authors argued that acute anxiety or trauma-induced disruptions in integrating interoceptive and exteroceptive signals play a significant role in the development of DPD symptoms. They also highlighted the need for further research utilizing analysis methods that consider this integration of signals to address diagnostic challenges associated with DPD. In addition, they suggested tools for prospective studies focusing on electrophysiological biomarkers specific to DPD and emphasized the urgent need to fully explore their diagnostic potential. This comprehensive review provides valuable insights into understanding and potentially diagnosing depersonalisation/derealisation disorder more effectively in clinical settings.
- Depersonalisation/derealisation disorder (DPD) is a condition that makes some people feel disconnected from themselves or their surroundings.
- It can take a long time, about 7-12 years, for doctors to figure out someone has DPD because not many people know about it.
- Scientists did a study to look at how the brain works in people with DPD using special tests.
- They looked at brain waves and signals to see if they could find patterns that might help diagnose DPD better.
- Feeling very anxious or going through a traumatic experience can make DPD symptoms worse.
Definitions
- Depersonalisation/derealisation disorder (DPD): A mental health condition where a person feels detached from themselves or the world around them.
- Neural correlates: Connections between brain activity and specific mental functions or experiences.
- Electrophysiological techniques: Methods that measure electrical activity in the body, often used to study brain function.
- Biomarkers: Biological indicators that can be measured and used to identify certain conditions or diseases.
- Interoceptive and exteroceptive signals: Internal sensations felt by the body (interoceptive) and external sensory information received from the environment (exteroceptive).
Introduction
Depersonalisation/derealisation disorder (DPD) is a dissociative disorder that affects 1-2% of the population. It is characterized by persistent or recurrent episodes of feeling detached from one's own body, thoughts, and surroundings (depersonalization), or experiencing the external world as unreal or dreamlike (derealization). These symptoms can be distressing and disruptive to daily life, yet DPD often goes undiagnosed for years.
The Delay in Diagnosis
According to a systematic review conducted by Abbas Salami, Javier Andreu-Perez, and Helge Gillmeister, it takes an average of 7-12 years for individuals with DPD to receive an accurate diagnosis. This delay can be attributed to the lack of understanding and awareness surrounding this disorder. Many people with DPD may not even realize they have a diagnosable condition and may instead attribute their symptoms to other mental health issues such as anxiety or depression.
The Need for Research
To address this issue, Salami et al. conducted a comprehensive review of existing research on DPD using electrophysiological techniques. Electrophysiology involves measuring electrical activity in the brain using tools like electroencephalography (EEG) and event-related potentials (ERPs). The authors aimed to explore the neural correlates of core DPD symptoms in order to identify potential biomarkers that could aid in diagnosis.
The Study
The systematic review covered publications from 1992 to 2020 and included studies that used electrophysiological techniques to investigate DPD symptoms. The authors focused on three main areas: EEG power spectrum analysis, components of ERPs, and vestibular/heartbeat evoked potentials.
EEG Power Spectrum Analysis
The EEG power spectrum refers to the distribution of electrical activity in different frequency bands in the brain. Salami et al. found that individuals with DPD showed increased power in the theta and alpha frequency bands, which are associated with relaxation and daydreaming states. This suggests that individuals with DPD may have difficulty regulating their attention and arousal levels.
Components of ERPs
ERPs are changes in electrical activity recorded from the scalp in response to specific stimuli or tasks. The review identified several ERP components that were consistently altered in individuals with DPD, including a reduced P300 amplitude (associated with attention and working memory) and an enhanced N100 amplitude (associated with early sensory processing). These findings suggest impairments in cognitive processing and sensory integration among those with DPD.
Vestibular/Heartbeat Evoked Potentials
The vestibular system is responsible for our sense of balance and spatial orientation, while heartbeat evoked potentials measure brain responses to one's own heartbeat. Both of these systems play a role in integrating interoceptive (internal bodily sensations) and exteroceptive (external environmental cues) signals. Salami et al. found evidence that disruptions in this integration may contribute to the development of DPD symptoms.
Implications for Diagnosis
Based on their findings, Salami et al. argued that electrophysiological techniques could potentially serve as biomarkers for diagnosing DPD more accurately. They highlighted the need for further research utilizing analysis methods that consider the integration of interoceptive and exteroceptive signals to address diagnostic challenges associated with this disorder.
Tools for Future Studies
The authors also suggested specific tools for prospective studies focusing on electrophysiological biomarkers specific to DPD, such as source localization techniques to identify brain regions involved in symptom generation, as well as machine learning algorithms to aid diagnosis based on EEG data.
Conclusion
In conclusion, the systematic review conducted by Salami et al. provides valuable insights into understanding and potentially diagnosing depersonalisation/derealisation disorder more effectively in clinical settings. The authors emphasized the urgent need for further research to fully explore the diagnostic potential of electrophysiological biomarkers specific to DPD. With a better understanding of the neural correlates of this disorder, we can hope for earlier and more accurate diagnoses, leading to improved treatment outcomes for those affected by DPD.
Depersonalisation/derealisation disorder (DPD) refers to frequent and persistent detachment from bodily self and disengagement from the outside world. As a dissociative disorder, DPD affects 1-2% of the population, but takes 7-12 years on average to be accurately diagnosed. In this systematic review, we comprehensively describe research targeting the neural correlates of core DPD symptoms, covering publications between 1992 and 2020 that have used electrophysiological techniques. The aim was to investigate the diagnostic potential of these relatively inexpensive and convenient neuroimaging tools. We review the EEG power spectrum, components of the event-related potential (ERP), as well as vestibular and heartbeat evoked potentials as likely electrophysiological biomarkers to study DPD symptoms. We argue that acute anxiety- or trauma-related impairments in the integration of interoceptive and exteroceptive signals play a key role in the formation of DPD symptoms, and that future research needs analysis methods that can take this integration into account. We suggest tools for prospective studies of electrophysiological DPD biomarkers, which are urgently needed to fully develop their diagnostic potential.
