Roger Sperry Roger Sperry was a psychobiologist neuropsychologist and neurobiologist who won the Nobel Prize for his split-brain research done with, among others, his student Michael Gazzaniga. Sperry found that the two hemispheres of the brain, after cutting the corpus callosum connecting them, each remained "a conscious system in its own right, perceiving, thinking, remembering, reasoning, willing, and emoting, all at a characteristically human level, and. Like them, he rejected materialism or physicalism and reductionism about the mind and brain.
History[ edit ] In the 's, research on people with certain brain injuries made it possible to suspect that the "language center" in the brain was commonly situated in the left hemisphere. One had observed that people with lesions in two specific areas on the left hemisphere lost their ability to talk, for example.
Roger Sperry and his colleague pioneered research. In his early work on animal subjects, Sperry made many noteworthy discoveries. The results of these studies over the next thirty years later led to Roger Sperry being awarded the Nobel Prize in Physiology or Medicine in Sperry received the prize for his discoveries concerning the functional specialization of the cerebral hemispheres.
With the help of so-called "split brain" patients, he carried out experiments, and for the first time in history, knowledge about the left and right hemispheres was revealed.
Even though Sperry is considered the founder of split-brain research, Gazzaniga's clear summaries of their collaborative work are consistently cited in psychology texts. In Sperry and Gazzaniga's "The Split Brain in Man" experiment published in Scientific American in they wanted to explore the extent to which two halves of the human brain were able to function independently and whether or not they had separate and unique abilities.
They wanted to examine how perceptual and intellectual skills were affected in someone with a split-brain. At Caltech, Gazzaniga worked with Sperry on the effects of split-brain surgery on perception, vision and other brain functions. The surgery, which was a treatment for severe epilepsy, involved severing the corpus callosum, which carries signals between the left-brain hemisphere, the seat of speech and analytical capacity, and the right-brain hemisphere, which helps recognize visual patterns.
At the time this article was written, only ten patients had undergone the surgery to sever their corpus callosum corpus callosotomy.
Four of these patients had consented to participate in Sperry and Gazzaniga's research. After the corpus callosum severing, all four participants' personality, intelligence, and emotions appeared to be unaffected. However,the testing done by Sperry and Gazzaniga showed the subjects demonstrated unusual mental abilities.
The researchers created three types of tests to analyze the range of cognitive capabilities of the split-brain subjects. The first was to test their visual stimulation abilities, the second test was a tactile stimulation situation and the third tested auditory abilities.
Visual test[ edit ] The first test started with a board that had a horizontal row of lights. The subject was told to sit in front of the board and stare at a point in the middle of the lights, then the bulbs would flash across both the right and left visual fields.
When the patients were asked to describe afterward what they saw, they said that only the lights on the right side of the board had lit up. Next when Sperry and Gazzaniga flashed the lights on the right side of the board on the subjects left side of their visual field, they claimed to not have seen any lights at all.
When the experimenters conducted the test again, they asked the subjects to point to the lights that lit up. Although subjects had only reported seeing the lights flash on the right, they actually pointed to all the lights in both visual fields.
This showed that both brain hemispheres had seen the lights and were equally competent in visual perception.
This test supports the idea that in order to say one has seen something, the region of the brain associated with speech must be able to communicate with areas of the brain that process the visual information. Tactile test[ edit ] In a second experiment Sperry and Gazzaniga placed a small object in the subject's right or left hand, without being able to see or hear it.
Placed in the right hand, the isolated left hemisphere perceived the object and could easily describe and name it. However, placed in the left hand, the isolated right hemisphere could not name or describe the object.
Questioning this result, the researchers found that the subjects could later match it from several similar objects; tactile sensations limited to the right hemisphere were accurately perceived but could not be verbalized.
This further demonstrated the apparent location or lateralization of language functions in the left hemisphere.In the s and s, Roger Sperry performed experiments on cats, monkeys, and humans to study functional differences between the two hemispheres of the brain in the United States.
To do so he studied the corpus callosum, which is a large bundle of neurons that connects the two hemispheres of the. The Nobel Prize in Physiology or Medicine was divided, one half awarded to Roger W.
Sperry "for his discoveries concerning the functional specialization of the cerebral hemispheres", the other half jointly to David H. Hubel and Torsten N. Wiesel "for their discoveries concerning information processing in the .
Split-brain is a lay term to describe the result when the corpus callosum connecting the two hemispheres of the brain is severed to some degree. It is an association of symptoms produced by disruption of or interference with the connection between the hemispheres of the brain.
Psychobiologist Roger Sperry discovered that human beings are of two minds.
He found that the human brain has specialized functions on the right and left, and that the two sides can operate.
Sperry was born in and grew up on a farm near Hartford, Connecticut. He earned a master’s degree in psychology at Oberlin, College, then a Ph.D in zoology at the University of Chicago. He conducted years of research at Harvard and at the Yerkes Laboratory for Primate Biology, in .
Roger Perry, Actor: Star Trek. Fresh-faced, blue-eyed Roger Perry is best remembered for his guest-starring role as the time-travelling U.S. Air Force pilot John Christopher in the original Star Trek: Tomorrow Is Yesterday () episode. Discovered by Lucille Ball and signed as a Desilu contract player, he began his screen career in anthology benjaminpohle.com: May 07, Roger Sperry was a psychobiologist (neuropsychologist and neurobiologist) who won the Nobel Prize for his split-brain research done with, among others, his student Michael benjaminpohle.com found that the two hemispheres of the brain, after cutting the corpus callosum connecting them, each remained "a conscious system in its own right, perceiving, thinking, remembering, reasoning, willing, and. Life Roger Sperry was born in Hartford, Connecticut, USA. His father worked at a bank and his mother was also schooled in economics. Roger Sperry studied psychology and other subjects at Oberlin College and zoology at the University of Chicago.
Roger Perry, Actor: Star Trek. Fresh-faced, blue-eyed Roger Perry is best remembered for his guest-starring role as the time-travelling U.S.
Air Force pilot John Christopher in the original Star Trek: Tomorrow Is Yesterday () episode. Discovered by Lucille Ball and signed as a Desilu contract player, he began his screen career in anthology benjaminpohle.com: May 07,