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An overview of the groundbreaking split-brain experiments conducted by Sperry and Gazzaniga in the 1960s. The experiments involved patients with epilepsy who underwent a surgical procedure to sever the corpus callosum, leading to the discovery of unique functions of each cerebral hemisphere. details about the experimental setup, observations, and the significance of the findings in understanding hemispheric specialization in the human brain.
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Split-Brain Experiment
When the band of nerve tissue between the two cerebral hemispheres, called the corpus callosum, was cut through, all communication between the two hemispheres of the brain was severed.
The patient was asked to focus on a dot in the middle of a screen set up in front of him or her.
In this case, the information about the apple displayed in the right visual field would be relayed to the left hemisphere. I see an apple. The patient could name the object, just as one would expect.
When an object was displayed in the left visual field, the corresponding visual information was relayed to the right hemisphere.
The left side of the brain is responsible for speech. The “mute” right side, unable to communicate with the left side, could not form the required words. I don’t see anything. s p e e c h n o c o m m u n i c a t i o n
Yet the participant, using his left hand, which was controlled by the right hemisphere, was able to…
…select the object he had actually seen, despite having no conscious memory of it!
In another variant of the experiment, the patient was able to draw the object with his left hand.
Video of a Split-Brain Experiment https://www.youtube.com/watch?time_continue=3&v=ZMLzP1VCANo
Description of the Split-Brain Experiments and Game at Nobelprize.org http://www.nobelprize.org/educational/medicine/split-brain/ background.html http://www.nobelprize.org/educational/medicine/split-brain/ splitbrainexp.html Description of the Split-Brain Experiments at Neuroscience for Kids https://faculty.washington.edu/chudler/split.html
