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Synesthesia (also spelled synæsthesia or synaesthesia, plural synesthesiae or synaesthesiae)—from the Ancient Greek σύν (syn), "together," and αἴσθησις (aisthēsis), "sensation"—is a neurologically-based condition in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People who report such experiences are known as synesthetes.
The ventromedial prefrontal cortex is a part of the prefrontal cortex in the mammalian brain. The ventral medial prefrontal is located in the frontal lobe and is implicated in the processing of risk and fear, and in decision making.
Dr. John Lorber (1915–1996), neurology professor at the University of Sheffield in the United Kingdom, recalled the time in the 1970s when the campus doctor asked him to examine a student whose head was a bit larger than normal. Instead of the normal 4.5-centimeter thickness of brain tissue between the ventricles and the cortical surface, Lorber discovered that the student had only a thin layer of mantle measuring about a millimeter and his cranium was filled mainly with cerebrospinal fluid.
Is your brain you really necessary? The reason for my apparently absurd question is the remarkable research conducted at the University of Sheffield by neurology professor the late Dr. John Lorber.
No, I am not referring to politicians, even the ones who you hate, and I’m also not speaking metaphorically. Neurologist John Lorber, who was a specialist in the treatment of the condition hydrocephalus, found that often despite having only a small fraction of the mass of a normal brain, hydrocephalus sufferers were not cognitively impaired. Quite disturbingly he found several individuals who had only %5 of the brain mass that they should have who seemed to have no cognitive symptoms at all. He actually sites 4 individuals who fit this description, one of whom has a honors degree in mathematics.