What experimental design did Sperry use?
Sperry (1968) used a quasi experiment in a laboratory with an independent measures design. The independent variable was whether the individual had a split-brain or not. There were dependent variable was that individual’s performance on visual and tactile tasks.
How was Sperry a quasi experiment?
Sperry aimed to study the effects of hemisphere deconnection and to show that each hemisphere has different functions. This is considered a quasi-experiment because the independent variable (IV) – having a split brain or not – was not directly manipulated by the researchers.
What is the Sperry and Gazzaniga experiment?
In the early 1960s, Sperry and colleagues, including Michael Gazzaniga, conducted extensive experiments on an epileptic patient who had had his corpus collosum, the “bridge” between the left and right hemispheres of the brain, split so that the connection was severed.
What did Roger Sperry contribution to psychology?
Sperry was an American Psychobiologist who discovered that the human brain is actually made up of two parts. He found out that both the left and right parts of the human brain have specialized functions and that the two sides can operate independently. Roger Sperry was born on August 20, 1913 in Hartford, Connecticut.
Why does Sperry’s research lack ecological validity?
Sperry’s study of investigating split-brain patients has low ecological validity as we cannot generalize the findings from the study to those who haven’t had their corpus callosum severed and overall the mundane realism in the study is low.
What data did Sperry collect?
He found that after separating the corpus callosum, the two hemispheres of the brain could not communicate and they performed functions as if the other hemisphere did not exist. Sperry also studied optic nerve regeneration and developed the chemoaffinity hypothesis.
How is sperrys study scientific?
Sperry severed the corpus callosum in cats and monkeys to study the function of each side of the brain. He found that if hemispheres were not connected, they functioned independently of one another, which he called a split-brain. The split-brain enabled animals to memorize double the information.
What did Michael Gazzaniga do with split-brain patients quizlet?
Michael Gazzaniga (1967) conducted individual BLANK studies on split-brain patients, so called because each of them had his or her corpus callosum severed.
What happens if your brain is split in two?
Since information cannot be directly shared between the two hemispheres, split-brain patients display unusual behaviours, particularly concerning speech and object recognition.
What did Sperry do?
Sperry and Gazzaniga (1967) were the first to investigate hemispheric lateralisation with the use of split-brain patients. Background: Split-brain patients are individuals who have undergone a surgical procedure where the corpus callosum, which connects the two hemispheres, is cut.
How does sperrys study relate to the biological area?
Sperry (1968) Split brain study Biological Biological because it is showing, through split-brain patients, the way in which different abilities are localized within the two hemispheres of the brain and distinct areas control specific behaviours.
How does sperrys study link to the biological area?
What is the purpose of a split-brain operation?
Split-brain surgery, or corpus calloscotomy, is a drastic way of alleviating epileptic seizures, the occurrence of sporadic electrical storms in the brain. The procedure involves severing the corpus callosum, the main bond between the brain’s left and right hemispheres.
What do split-brain patients see?
Perception appears to be more split, while responding remains largely unified. Whether a stimulus appears in the left or the right visual hemifield strongly impacts performance of split-brain patients. However, response type (left hand, right hand or verbally) seems to have a much smaller, or no effect at all.
Can split-brain patients move both hands at once?
They can also learn new tasks that involve either parallel or mirrored movements of their fingers or hands. They cannot, however, learn to perform new tasks that require interdependent movement of each hand, such as learning to play the piano, where both hands must work together to produce the desired music.
Can split-brain patients see?
How does Sperry link to the key theme?
How does Sperry’s study link to its key theme? It demonstrated the importance of the corpus callosum as a communication pathway between the left and right hemisphere and provided evidence of the different functions each hemisphere performs.
Why is split-brain important?
For several decades, split-brain research has provided valuable insight into the fields of psychology and neuroscience. These studies have progressed our knowledge of hemispheric specialization, language processing, the role of the corpus callosum, cognition, and even human consciousness.
Is Sperry ethnocentric?
Ethnocentrism. Since brain lateralisation is affected by the anatomy and physiognomy of the brain, we could argue that Sperry’s study was not ethnocentric. Links to areas. Falls within the biological area as it is investigating regions of the brain and lateralisation of brain function.
What is the split-brain experiment?
Split-brain research refers to research and insights garnered from studying patients who have had their corpus callosum, a bundle of fibers connecting the two hemispheres of the brain, severed, in most cases to treat severe epilepsy.
What medical procedure is used to achieve a split-brain?
During a corpus callosotomy, a doctor called a neurosurgeon, cuts the brain’s corpus callosum. This band of nerve fibers carries messages between the brain’s two halves, or hemispheres. A corpus callosotomy stops seizure signals from going back and forth between the two hemispheres.
How do split-brain patients think differently?
What can split-brain patients not do?
The canonical idea of split-brain patients is that they cannot compare stimuli across visual half-fields (left), because visual processing is not integrated across hemispheres. This is what we found as well.
How do people with split-brain See?
What is the split-brain theory?
The split-brain phenomenon is caused by the surgical severing of the corpus callosum, the main route of communication between the cerebral hemispheres. The classical view of this syndrome asserts that conscious unity is abolished.