Sperry and Casey Practice Questions PDF

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This is a checklist for everything that may come up in the exam from sections A, B and C for the Component 2 exam of Psychology. ...

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Sperry and Casey Revision Questions

1. Hemisphere deconnection is where someone with severe epilepsy who is not responding to drug treatment undergoes surgery to have their Corpus Callosum split to de-connect the left and right hemisphere. This will mean that the brain urges that cause the fits cannot pass over the Corpus Callosum therefore they will be less severe because they will be confined to one hemisphere. 2. One finding from the visual test is that if the image is only presented to the RVF then they can only find the object with their right hand and can name the image but if it is only presented to the LVF then they can draw the image with their left hand and can find it with their left hand but cannot name it because the image is stuck in the right hemisphere and only the left has the language ability. 3. One finding from the tactile test is that if the object is in their right hand then they can describe it and can find it with their right hand but not their left and if it is placed into their left hand then they cannot name and cannot find it with their right hand but can find it with their left hand. 4. Sperry could be considered a quasi-experiment because it takes place in a lab but the independent variable, which is having the Corpus Callosum separated is naturally occurring because they had already had the operation so it could not be controlled. The IV is naturally occurring. 5. Sperry could be considered a series of case studies because the experiment involved intensive study of behavioural symptoms resulting from hemisphere deconnection. They looked at laterality and language, as well as the visual system, collateral control, hearing and epilepsy. 6. Casey et al’s study is longitudinal because the first experiment takes place in the 1960’s, then again in 1993 and 2003. It is seeing if delay of gratifications stays the same in a person as a child and an adult. It is longitudinal because it took place over a long period of time, over 40 years. 7. One strength of using a longitudinal for Casey et al. is that it made the experiment more reliable and accurate. If they had done it all in one year then they would have to find child participants, participants in their 20’s and their 30’s but their experiment is to see if delay of gratification changes as an adult from a child. This would mean that they would need the same participant to see what they got as a child so they could compare it to when they were an adult. 8. One weakness of using a longitudinal study is that because it takes place over a long period of time, it can be quite expensive and would be very hard to replicate. Also, the same participants may not be able to take part down the line because they have moved or are dead so you will lose participants as time goes on. 9. One result from Casey et al. is that in experiment 2, the two delay groups did not differ significantly in reaction times in correct ‘go’ trials. This is similar to the reaction time results from experiment 1. Therefore, we can conclude that delay of gratification does not have an effect on reaction times. 10. Casey and Sperry did not have an ethical issue that they both shared because Sperry did not have any ethical issues. Casey had no protection of participants. The only one that you could suggest for both would be protection of participants because participants in both studies could have suffered from embarrassment from their results in the experiment.

11. The reason Casey and Sperry both had low ecological validity was because they both took place in a lab and were studies that you would not do every day. In Sperry’s experiment, participants had to do tests with one eye covered which is low ecological validity because people use both eyes to see. Casey was not ecologically valid because this would not be a test that you would be doing every day. 12. The areas of the brain involved are the Ventral Striatum and the Inferior Frontal Gyrus. The Ventral Striatum had more activity if the person was a low delayer and the Inferior Frontal Gyrus was involved in accurately withholding a response and compared with high delayers, low delayers had less activity....