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BFS was classified in the fourth revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) as a culture-bound syndrome. [1] Individuals with symptoms of brain fag must be differentiated from those with the syndrome according to the Brain Fag Syndrome Scale (BFSS); [1] Ola et al said it would not be "surpris[ing] if BFS was called an equivalent of either depression or anxiety".
The most frequently reported associated findings are backwards and lateral flexion of the neck, widely opened mouth, tongue protrusion, and ocular pain. However, the condition may also be associated with intensely painful jaw spasms which may result in the breaking of a tooth. A wave of exhaustion may follow an episode.
The optic nerve contains axons of nerve cells that emerge from the retina, leave the eye at the optic disc, and go to the visual cortex where input from the eye is processed into vision. There are 1.2 million optic nerve fibers that derive from the retinal ganglion cells of the inner retina. [2] Damage to the optic nerve can have different causes:
The experience of eye strain when reading in dim light has given rise to the common misconception that such an activity causes permanent eye damage. [3] When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the ciliary muscles and the extraocular muscles are strained. This causes discomfort ...
The underlying mechanism is believed to involve excessive excitability of neurons in the right lingual gyrus and left anterior lobe of the cerebellum. Another hypothesis proposes that visual snow syndrome could be a type of thalamocortical dysrhythmia and may involve the thalamic reticular nucleus (TRN). A failure of inhibitory action from the ...
In a standing position, the main outflow from the head is through the vertebral venous system because the internal jugular veins, located primarily between the carotid artery and the sternocleidomastoid muscle are partially or completely occluded due to the pressure from these structures, and in a supine position, the main outflow is through ...
Eventually he separated it from anxiety neurosis, though he believed that a combination of the two conditions existed in many cases. [3] In 19th-century Britain and, by extension, across the British Empire, neurasthenia was also used to describe mental exhaustion or fatigue in “brain workers” or in the context of “overstudy”. [15]
Psychological stress can be external and related to the environment, [3] but may also be caused by internal perceptions that cause an individual to experience anxiety or other negative emotions surrounding a situation, such as pressure, discomfort, etc., which they then deem stressful. Hans Selye (1974) proposed four variations of stress. [4]