Topic 4: The brain and neuropsychology - 4.2 Studies — Edexcel GCSE Psychology
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Topic 4: The brain and neuropsychology - 4.2 Studies explained
Topic 4: The brain and neuropsychology - 4.2 Studies covers 3 specification points, including Understand the aims, procedures and findings… and Clues About the Brain from the Skull of a….
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Open a point below for its explanation and revision guidance.
Understand the aims, procedures and findings (results and conclusions), strengths and weaknesses of:
This specification statement outlines the core framework you must use when studying any key psychological study in this topic. You need to systematically break down each study into five distinct components. First, identify the 'aims'—what the researchers intended to investigate. Next, detail the 'procedures'—the exact step-by-step methods used to conduct the research. Then, learn the 'findings', which encompass both the raw 'results' (data collected) and the 'conclusions' (what the data means). Finally, evaluate the study by explaining its 'strengths' (what makes it reliable or valid) and 'weaknesses' (methodological flaws or ethical issues). Using this structured approach ensures you can answer both descriptive and evaluative exam questions effectively.
4.2.1 Damasio et al (1994) The Return of Phineas Gage: Clues About the Brain from the Skull of a Famous Patient
Damasio et al. (1994) aimed to identify the exact location of brain damage in Phineas Gage to understand its effect on his behaviour. They created a 3D computer model of Gage's skull using measurements and X-rays, mapping 20 potential trajectories for the tamping iron. Findings revealed the damage was restricted to the frontal lobes, specifically the ventromedial region of both hemispheres, sparing motor areas. They concluded this region is crucial for decision-making and regulating emotion, explaining Gage's personality changes. A strength is the use of objective computer modelling. A weakness is the reliance on a single historical case study, which limits the generalisability of the findings to the wider population.
4.2.2 Sperry (1968) Hemisphere Deconnection and Unity in Conscious Awareness
Sperry (1968) investigated hemisphere deconnection to understand brain lateralisation and unity in conscious awareness. The study involved 11 patients who had a corpus callosotomy to treat severe epilepsy. Sperry used a tachistoscope to present visual stimuli to either the left or right visual field for 0.1 seconds. When an image was shown to the right visual field (processed by the left hemisphere), patients could name it. When shown to the left visual field (processed by the right hemisphere), they could not name it but could select a matching object with their left hand. This demonstrated that the left hemisphere is responsible for language, while the right hemisphere excels in spatial tasks, showing divided conscious awareness.
Your focus
- Identify the aims, procedures, and findings of key psychological studies.
- Distinguish between the raw results of a study and the conclusions drawn from them.
- Evaluate psychological studies by articulating specific methodological strengths and weaknesses.
Show all 9 objectives
- Describe the aims and procedures of Damasio et al. (1994).
- Explain the findings and conclusions regarding the role of the ventromedial frontal region.
- Evaluate the methodology of Damasio et al. (1994) in terms of strengths and weaknesses.
- Describe the aim, procedure, and findings of Sperry's (1968) study.
- Explain how the findings of Sperry (1968) support the concept of hemispheric lateralisation.
- Evaluate the methodology of Sperry's (1968) study, including its sample and controls.
Topic 4: The brain and neuropsychology - 4.2 Studies exam tips
Marking Points
- State the aim of Damasio et al. (1994) as identifying the specific brain areas damaged in Phineas Gage.
- Describe the procedure involving the creation of a 3D computer model of the skull to map the iron's trajectory.
- Identify the ventromedial region of the frontal lobes as the specific area damaged.
- Explain the conclusion that the ventromedial frontal region is responsible for emotional regulation and decision-making.
- Evaluate the study by noting the scientific objectivity of the 3D modelling as a strength and the lack of generalisability of a unique case study as a weakness.
- Identify the sample size as 11 split-brain patients.
- Recognise the independent variable as having a split brain or not, noting it was a quasi-experiment.
- Recall that stimuli presented to the right visual field are processed by the left hemisphere.
- State that the left hemisphere is responsible for language production.
- Identify that the right hemisphere can process spatial information and control the left hand.
Examiner Tips
- 💡Create summary flashcards for each core study with clear headings for aims, procedures, findings, strengths, and weaknesses.
- 💡When asked to evaluate a study, ensure you provide a balanced argument containing both strengths and weaknesses.
- 💡Practice writing out the procedures in chronological order to ensure you do not miss any vital steps that might be required for a description question.
- 💡Memorise the specific brain region identified in the findings: the ventromedial region of the frontal lobes.
- 💡When evaluating, explicitly link the weakness of generalisability to the fact that Gage's brain damage was entirely unique.
- 💡Be prepared to distinguish between the raw results (the specific areas of brain damage) and the conclusions (what this means for frontal lobe function).
- 💡Memorise the specific presentation time of 0.1 seconds used to prevent eye movement across visual fields.
- 💡Use the phrase 'contralateral control' to describe how the right hemisphere controls the left side of the body.
- 💡When answering questions on Sperry, clearly distinguish between the visual field, the hemisphere processing the information, and the hand used to respond.
Common Mistakes
- Confusing results with conclusions. Correction: Results are the specific data or facts gathered, whereas conclusions are the interpretations of what those facts mean for human behaviour.
- Providing generic strengths and weaknesses. Correction: Always link evaluative points directly to the specific procedures or context of the study being discussed, rather than just stating that a study lacks ecological validity.
- Forgetting the aim of the study. Correction: Memorise the specific aim, as it provides the context for why the procedures were chosen and helps make sense of the final conclusions.
- Stating that Damasio treated Phineas Gage. Correction: Damasio et al. conducted their research in 1994 using Gage's preserved skull, long after Gage's death.
- Claiming the damage affected Gage's motor skills or speech. Correction: The findings specifically showed that the damage spared the motor and language areas, affecting only his personality and decision-making.
- Confusing the entry and exit points of the iron. Correction: The iron entered under the left cheekbone and exited through the top of the skull, which was mapped using 20 potential trajectories.
- Mistake: Believing the left eye sends information only to the left hemisphere. Correction: Information from the left visual field of both eyes goes to the right hemisphere.
- Mistake: Thinking split-brain patients have lower intelligence. Correction: The surgery did not affect their overall intelligence or personality, only specific lateralised functions.
- Mistake: Confusing the functions of the hemispheres. Correction: Remember that the left hemisphere is dominant for language, while the right is dominant for spatial and visual tasks.