Some context: Henry Gustav Molaison (February 26, 1926 - December 2, 2008), known widely as H.M., was an American memory disorder patient who had a bilateral medial temporal lobectomy to surgically resect the anterior two thirds of his hippocampi, parahippocampal cortices, entorhinal cortices, piriform cortices, and amygdalae in an attempt to cure his epilepsy. Although the surgery was partially successful in controlling his epilepsy, a severe side effect was that he became unable to form new memories. H.M. was widely studied from late 1957 until his death in 2008. His case played an important role in the development of theories that explain the link between brain function and memory, and in the development of cognitive neuropsychology, a branch of psychology that aims to understand how the structure and function of the brain relates to specific psychological processes.
Henry Molaison was born on February 26, 1926, and experienced intractable epilepsy that has sometimes been attributed to a bicycle accident at the age of seven. (This accident was initially reported to have occurred at age nine, but was corrected by the patient's mother at a later stage.) He had partial seizures for many years, and then several tonic-clonic seizures following his 16th birthday. In 1953, he was referred to William Beecher Scoville, a neurosurgeon at Hartford Hospital, for treatment. Scoville localized Molaison's epilepsy to his left and right medial temporal lobes (MTLs) and suggested surgical resection of the MTLs as a treatment. On September 1, 1953, at the age of 27, Molaison's bilateral medial temporal lobe resection included the removal of the hippocampal formation and adjacent structures, including most of the amygdaloid complex and entorhinal cortex. His hippocampi appeared entirely nonfunctional because the remaining 2 cm of hippocampal tissue appeared to have atrophied and because the entire entorhinal cortex, which forms the major sensory input to the hippocampus, was destroyed. Some of his anterolateral temporal cortex was also destroyed. After the surgery, which was partially successful in its primary goal of controlling his epilepsy, Molaison developed severe anterograde amnesia: although his working memory and procedural memory were intact, he could not commit new events to his explicit memory. According to some scientists, he was impaired in his ability to form new semantic knowledge, but researchers argue over the extent of this impairment. He also had moderate retrograde amnesia, and could not remember most events in the one- to two-year period before surgery, nor some events up to 11 years before, meaning that his amnesia was temporally graded. However, his ability to form long-term procedural memories was intact; thus he could, for example, learn new motor skills, despite not being able to remember learning them. The case was first reported in a paper by Scoville and Brenda Milner in 1957. Near the end of his life, Molaison regularly filled in crossword puzzles. He was able to fill in answers to clues that referred to pre-1953 knowledge. For post-1953 information he was able to modify old memories with new information. For instance, he could add a memory about Jonas Salk by modifying his memory of polio. He died on December 2, 2008.
Did he ever get any better from the operations?
A: After the surgery, which was partially successful in its primary goal of controlling his epilepsy, Molaison developed severe anterograde amnesia:
Some context: Clarence White (born Clarence Joseph LeBlanc; June 7, 1944 - July 14, 1973), was an American bluegrass and country guitarist and singer. He is best known as a member of the bluegrass ensemble the Kentucky Colonels and the rock band the Byrds, as well as for being a pioneer of the musical genre of country rock during the late 1960s. White also worked extensively as a session musician, appearing on recordings by the Everly Brothers, Joe Cocker, Ricky Nelson, Pat Boone, the Monkees, Randy Newman, Gene Clark, Linda Ronstadt, Arlo Guthrie, and Jackson Browne amongst others. Together with frequent collaborator Gene Parsons, he invented the B-Bender, a guitar accessory that enables a player to mechanically bend the B-string up a whole tone and emulate the sound of a pedal steel guitar.
Clarence White helped popularize the acoustic guitar as a lead instrument in bluegrass music, building on the work of guitarists such as Doc Watson. Prior to the advent of the more aggressive flatpicking style pioneered by guitarists like Watson and White, the guitar was strictly a rhythm instrument, save for a few exceptions (such as the occasional guitar track by banjoist Don Reno). Many of the most influential flatpickers of the 20th century cite White as a primary influence, including Dan Crary, Norman Blake, and Tony Rice. Rice owns and plays White's highly modified 1935 Martin D-28. David Grier and Russ Barenberg are two other acoustic guitarists who were heavily influenced by White's guitar work. White's bluegrass playing with the Kentucky Colonels was also a considerable influence on Jerry Garcia of the Grateful Dead, who traveled with the band during 1964. On the electric side of the guitar spectrum, White was similarly influential. Together with fellow Byrds bandmember Gene Parsons, White invented the B-Bender device. This device raises the B-string (second string) of the guitar a whole step by the use of pulleys and levers attached to both the upper strap knob and the second string on the guitar. It is activated by pushing down on the neck, and produces a "pedal steel" type sound. Arlen Roth, heavily influenced by this style, did not at the time know that White and Parsons had invented a B-bender, so instead developed his own unique all-finger bending version of this technique. This was heavily documented in his ground-breaking book, "Nashville Guitar", all of his recordings, as well as his book "Masters of the Telecaster". Subsequently, his Telecaster sound became as notable as his bluegrass playing. Marty Stuart, another guitarist influenced by White's playing, now owns and regularly plays White's 1954 Fender Telecaster with the prototype B-Bender. Music archivist and writer Alec Palao has called White "one of a handful of true greats amongst the instrumentalists of 20th century popular music", before adding that "the waves created by the guitarist's idiosyncratic style are still forming ripples within bluegrass, country and rock 'n' roll." In 2003, White was ranked No. 41 on Rolling Stone magazine's list of the 100 Greatest Guitarists of All Time. In 2010, guitar manufacturer Gibson ranked White at No. 42 on their Top 50 Guitarists of All Time list.
Who did he influence on the electric side?
A:
White invented the B-Bender device.