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S.M., sometimes referred to as SM-046, is an American woman with a peculiar type of brain damage that physiologically reduces her ability to feel fear.First described by scientists in 1994, [1] she has had exclusive and complete bilateral amygdala destruction since late childhood as a consequence of Urbach–Wiethe disease.
Lesioning the amygdala causes blunted affect responses to both positive and negative stimuli. This effect is irreversible in the rhesus macaques; neonatal damage produces the same effect as damage that occurs later in life. The macaques' brain cannot compensate for early amygdala damage, even though significant neuronal growth may occur. [13]
The amygdala is one of the best-understood brain regions with regard to differences between the sexes. The amygdala is larger in males than females, in children aged 7 to 11, [17] adult humans, [18] and adult rats. [19] There is considerable growth within the first few years of structural development in both male and female amygdalae. [20]
Recognizing the signs of a stroke in women could make all the difference in saving a life. Here are 7 signs to look for.
Here are six signs of ADHD in women and girls. ADHD can be mistaken for anxiety, depression, and other mental health disorders. Here are six signs of ADHD in women and girls.
Social-emotional agnosia is mainly caused by abnormal functioning in a particular brain area called the amygdala. Typically this agnosia is only found in people with bilateral amygdala damage; that is damage to amygdala regions in both hemispheres of the brain. [citation needed] It can be accompanied by right or bilateral temporal lobe damage ...
“Many of the symptoms may express somatically, in the form of medical problems or conditions, such as ulcers, back pain, hypertension, and the like,” he says.
A large percent of the human studies are of anomalies due to accidents, tumors, or attempts to cure disease (e.g. seizures) using lesioning. Since very few such cases exist the sample size of human studies of emotional lateralization are generally very limited and may be as small as single person.