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In September 2021, two studies [30] found white matter alterations in parts of the visual cortex and outside the visual cortex in patients with visual snow syndrome. In November 2023, a study [ 31 ] revealed that glutamate and serotonin are involved in brain connectivity alterations in areas of the visual, salience, and limbic systems in VSS.
The content of hallucinations varies as well. Preliminary research has found that most individuals had multiple types of visual hallucinations. [20] Scenes involving people and/or animals were the most common, followed by simple geometric images. [4] Complex (formed) visual hallucinations are more common than Simple (non-formed) visual ...
Brain fog is a common symptom in many illnesses where chronic pain is a major component. [26] Brain fog affects 15% to 40% of those with chronic pain as their major illness. [27] In such illnesses, pain processing may use up resources, decreasing the brain's ability to think effectively. [26]
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Hallucinogen persisting perception disorder (HPPD) is a non-psychotic disorder in which a person experiences apparent lasting or persistent visual hallucinations or perceptual distortions after using drugs, [1] including but not limited to psychedelics, dissociatives, entactogens, tetrahydrocannabinol (THC), and SSRIs.
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A few studies record that visual hallucinations are likely to be concentrated in the blind regions. [10] Functional magnetic resonance imaging (fMRI) of Charles Bonnet syndrome patients displays a relationship between visual hallucinations and activity in the ventral occipital lobe. [1]
These pathologies are mainly near the base of the brain and the hallucinations have gone away in patients that had their pathology corrected such as the removal of a tumor. [1] The most commonly reported hallucinations are animals, people of any age, scary or deformed faces and heads, landscapes, or people walking in a line.