Introduction
This article analyzes the nature of functional neurological disorder (FND) and mass psychogenic phenomena, such as the controversial Havana syndrome. The text challenges the traditional medical divide between organic damage and psychological causes.
The reader will discover that a lack of changes on an MRI does not equate to an absence of illness. They will learn about the mechanism of predictive processing and the impact of the nocebo effect on the body's physiology, as well as how the social learning of symptoms can induce genuine physical suffering.
FND as a Disorder of Functional Control, Not Structural Damage
FND refers to disorders in which a patient loses neurological functions (e.g., walking, speech) despite the absence of visible tissue damage. These differ from typical organic injuries in that the problem is not a destroyed structure, but rather an error in functional control.
An example is a person who cannot walk forward but can walk backward. This is not a result of malingering, but rather the fact that excessive conscious control blocks motor automatisms. When attention is diverted, the automatic system regains control.
The development of FND can be triggered by physical factors (injuries, migraines) or stress. Standard imaging tests do not detect these issues because they measure structure rather than the dynamic cooperation of distributed neural networks.
FND as a Disorder of Network Dynamics and Agency, Not Simulation
Functional disorders differ from simulation (malingering) in the lack of voluntariness. A patient with FND authentically experiences an inability to move, whereas someone simulating consciously hides their ability. This mechanism is based on a disruption of the sense of agency, or the feeling of being in control of one's actions.
The treatment of FND differs from classical physiotherapy. Instead of training a damaged system, the therapist seeks conditions under which function returns automatically. The goal is to update the brain's predictive models and reduce pathological concentration on the symptom.
Modern neurology does not require the presence of psychological trauma for an FND diagnosis. This disorder proves that agency is a complex biological process, rather than a simple command from the "mind" to the "body."
Excessive Conscious Control Blocks Motor Automatisms
Individual prediction errors can become widespread through social learning. Observing others and adopting a shared narrative of threat can induce real physical symptoms, as seen in cases of mass psychogenic illness (MPI).
In Havana syndrome, the lack of MRI damage does not mean that patients were fabricating their symptoms. The suffering was real, but it may have been amplified by the nocebo mechanism. The absence of evidence for a secret weapon does not preclude the reality of the sensations, as anxiety and expectation alter physiology.
Even if some sounds in Havana were natural, it does not mean the entire syndrome is imagined. Diagnostic uncertainty and alarmist communication act as a biological symptom generator, increasing the brain's vigilance toward every unusual signal.
Summary
FND and Havana syndrome demonstrate that the boundary between "I can" and "my body can" is fragile. Willpower is not an autonomous controller, but the result of a balance between intention and the biological system that translates that intention into action.
This serves as a lesson that the sense of agency may be merely a coherent narrative constructed by the brain to hide its own unpredictability and susceptibility to social context.
Frequently Asked Questions
What are functional neurological disorders and how do they differ from typical organic damage?
Functional neurological disorders involve the loss of the ability to speak, see, or walk without the presence of structural damage. Unlike typical organic damage, where a function ceases to work due to a specific site of injury in the nervous system, in functional disorders, this ability may still exist, but the patient lacks normal, voluntary access to it.
1. What is the difference between functional disorders and malingering, and what is their mechanism in the brain?
2. Functional Neurological Disorders (FND) differ from malingering in that the experience of loss of control is involuntary, whereas in simulation, a person consciously hides their abilities. The mechanism of FND is linked to disruptions in the coordination of distributed neural networks and potential issues with precision control within the brain's predictive model.
3. Why might a person with functional disorders be unable to walk normally but be able to perform the movement under other circumstances, and does this mean they are faking it?
4. Excessive control and focus can block automatic sensorimotor networks, making normal walking difficult, while atypical tasks allow these systems to regain control. This does not indicate malingering, but rather proves that motor ability depends on the mode of control.
5. How does the treatment of functional disorders differ from classical physiotherapy, and do they require the presence of psychological trauma?
6. The treatment of functional disorders focuses on rediscovering preserved movement, strengthening automaticity, and changing the patient's body model, whereas classical physiotherapy after structural damage trains the function of the damaged system and supports compensation. The presence of psychological trauma is neither a diagnostic requirement nor necessary for these disorders to occur.
7. What causes the development of functional disorders and why cannot they be detected in standard imaging studies?
8. The development of functional disorders can be caused by predisposing, triggering (e.g., physical injuries, somatic diseases), and maintaining factors, such as anxiety or negative expectations. They cannot be detected in standard imaging studies because they result from a dysregulation of distributed networks in the brain, rather than a single structural change or a specific biomarker.
9. Why are functional neurological disorders (FND) not a simple result of trauma or a prediction error, and what do they say about the nature of human agency?
10. FNDs are not a simple result of trauma or a prediction error, but a complex family of disorders arising at the intersection of many regulatory systems (including attention, emotion, and learning). They show that agency is a construct resulting from the comparison of predictions and sensory signals, rather than a simple command from the mind to the body.
How can individual brain prediction errors transform into mass disease phenomena?
Individual prediction errors can transform into mass phenomena through information and social learning, as people observe others and adopt the group's interpretation of events. In closed communities under strong pressure, private prediction becomes collective, leading to the emergence of mass psychogenic illnesses.
Does the lack of visible brain damage in MRI scans in the case of Havana Syndrome mean that patients were fabricating their symptoms?
No, the absence of visible brain damage in MRI scans does not mean that the symptoms were faked. NIH researchers emphasized that the symptoms were real and seriously hindered life for some people, and the lack of permanent traces in imaging does not rule out an event that left no detectable mark.
Does the lack of evidence for the existence of a secret weapon rule out the reality of Havana Syndrome symptoms?
The lack of evidence for a secret weapon does not completely rule out a small number of events caused by external action. At the same time, some symptoms can be explained by the phenomenon of observational nocebo, in which measurable effects are induced through social learning of symptoms from other people.
How do social and cognitive mechanisms lead to the mass occurrence of real physical symptoms without an organic cause?
Real physical symptoms arise through social mechanisms such as observing other sick individuals, rumors, and a sense of shared threat, which increase vigilance and alter the body's physiology. This process resembles an information cascade: under conditions of uncertainty, people give more weight to the reactions of their environment than to their own signals, leading to a rational but erroneous interpretation of sensations as symptoms of illness.
Does the fact that some sounds from Havana were natural mean that the entire Havana Syndrome is made up?
No, the fact that some sounds had a natural source does not mean that the entire syndrome is fabricated. Demonstrating the natural origin of one specific recording does not resolve the causes of the health problems reported by those who experienced the incidents.
How do the lack of a clear diagnosis and the way threats are communicated influence the emergence of real physical symptoms?
The absence of a definitive diagnosis prevents the brain from closing the threat model, leading to generalization and the attribution of almost every unusual signal to an unknown phenomenon. Additionally, excessive alarmism in communication increases the body's vigilance and intensifies symptoms, while uncertainty becomes an active component of the biological environment that promotes the development of real symptoms.
