Considering everything, it seems we are dealing here with a special illness There are certainly more psychiatric illnesses than are listed in our textbooks. Alois Alzheimer
Once thought to be the product of demonic possession, immorality, or imbalanced humors, we now know that psychiatric symptoms are often caused by changes in the brain. Read on to learn about the people who helped us understand the brain as the driving force behind our behaviors.
Artist renditions estimating the rod path through Phineas Gage's brain.
Source: By Henry Jacob Bigelow; Ratiu et al.
Phineas Gage
In 1848, John Harlow first described the case of a 25-year-old railroad foreman named Phineas Gage. Gage was a "temperate" man: hardworking, polite, and well-liked by all those around him. One day, Gage was struck through the skull by an iron rod launched in an accidental explosion. The rod traveled through the prefrontal cortex of his brain. Remarkably, he survived with no deficits in his motor functionor memory. However, his family and friends noticed major changes in his personality. He became impatient, unreliable, vulgar, and was even described as developing the "animal passions of a strong man." This was the first glimpse into the important role of the prefrontal cortex in personality and social behavior.
Louis Victor Leborgne
Pierre Broca first published thecase of 50-year-old Louis Victor Leborgne in 1861. Despite normal intelligence, Leborgne inexplicably lost the ability to speak. His nickname was Tan, after thisbecame the only word he ever uttered. He was otherwise unaffected and seemed to follow directions and understand others without difficulty. After he died, Broca examined his brain, finding an abnormal area of brain tissue only in the left anterior frontal lobe. This suggested that the left and right sides of the brain were not always symmetric in their functions, as previously thought. Broca later went on to describe several other similar cases, cementing the role of the left anterior frontal lobe (now called Brocas area) as a crucial region for producing(but not understanding)language.
Auguste Deter, 1901.
Source: Unknown, Public Domain.
Auguste Deter
Psychiatrist and neuropathologist Aloysius Alzheimer described the case of Auguste Deter, a 56-year-old woman who passed away in 1906 after she developed strange behaviors, hallucinations, and memory loss. When Alzheimer looked at her brain under the microscope, he described amyloid plaques and neurofibrillary tangles that we now know are a hallmark of the disease that bears his name. This significant discovery was the first time that a biological molecule such as a protein was linked to a psychiatric illness.
JP
In 1933, Spafford Ackerly described the case of "JP who, beginning at a very young age, would do crude things like defecate in other's belongings, expose himself, and masturbate in front of other children at school. These behaviors worsened as he aged, leading to his arrest as a teenager. He was examined by Ackerly who found that the boy had a large cyst, likely present from birth, that caused severe damage to his prefrontal cortices. Like the case of Phineas Gage, JP helped us understand the crucial role that the prefrontal cortex plays in judgement, decision making, social behaviors and personality.
HM (Henry Gustav Molaison)
HM was a 29-year-old man who underwent an experimental surgery by William Beecher Scovillein 1953 to remove his medial temporal lobes (including the hippocampus and amygdala on both sides). The hope was that the surgery would control his severe epilepsy, and it did seem to help. But with that improvement came a very unexpected side effect: HM completely lost the ability to form certain kinds of new memories. While he was still able to form new implicit or procedural memories (like tying shoes or playing the piano), he was no longer able to form new semantic or declarative memories (like someones name or major life events). This taught us that memories were localized to a specific brain region, not distributed throughout the whole brain as previously thought.
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