In-depth Notes on Core Psychological Studies

Biological Approach

1. Dement & Kleitman (1957) – Sleep and Dreams

• Study Focus: Investigated the relationship between REM sleep and dreaming.
• Methodology: EEG recordings used to measure brain activity.
• Findings: REM sleep closely associated with vivid dreaming. Participants reported dream content when woken at different sleep stages (REM vs. NREM).
• Lead Investigators: William Dement and Nathaniel Kleitman.
• Sample Population: 9 adults (7 men, 2 women) via opportunity sampling.
• Aim: Explore how REM sleep correlates with dream recall.
• Hypothesis: Dreams are more likely to be recalled in REM than NREM.
• Variables:
  • IV: Sleep stage (REM vs. NREM)
  • DV: Dream recall upon awakening
  • Controlled: Sleep environment, EEG monitoring
  • Extraneous: Individual differences in sleep patterns
• Strengths and Weaknesses:
  • Strengths: High control of extraneous variables; objective EEG measurements.
  • Weaknesses: Small sample size limits generalizability.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited due to small sample.
  • Reliability: High due to EEG consistency.
  • Applicability: Important for sleep research.
  • Validity: High internal validity from controlled conditions.
  • Ethical: Minimal issues; non-invasive interventions.

2. Hassett et al. (2008) – Monkey Toy Preferences

• Study Focus: Examined sex differences in toy preferences among monkeys.
• Findings: Male monkeys preferred wheeled toys, females favored dolls.
• Lead Investigator: Janice M. Hassett.
• Sample Population: 34 juvenile rhesus monkeys (11 males, 23 females) via random selection.
• Aim: Investigate intrinsic sex differences in toy preferences.
• Hypothesis: Male monkeys prefer wheeled toys; females prefer plush dolls.
• Variables:
  • IV: Type of toy (wheeled vs. plush)
  • DV: Time spent interacting with each toy.
  • Controlled: Toy placement and environment
  • Extraneous: Individual differences in preferences
• Strengths and Weaknesses:
  • Strengths: High ecological validity through natural observation.
  • Weaknesses: Limited generalizability beyond rhesus monkeys.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited to non-human primates.
  • Reliability: High if repeated with same settings.
  • Applicability: Insightful for nature vs. nurture discussions regarding gender.
  • Validity: High due to natural settings.
  • Ethical: Minimal as natural behaviors were observed.

3. Hölzel et al. (2011) – Mindfulness and Brain Scans

• Study Focus: Investigated the impact of mindfulness meditation on brain structure.
• Findings: Increased gray matter density in areas linked with memory and emotional regulation among participants.
• Lead Investigator: Britta K. Hölzel.
• Sample Population: 16 adults (8 men, 8 women) with no prior meditation experience via volunteer sampling.
• Aim: Examine how mindfulness changes brain structure.
• Hypothesis: Mindfulness increases gray matter density in specific brain regions.
• Variables:
  • IV: Participation in an 8-week mindfulness program.
  • DV: Changes in gray matter density.
  • Controlled: Consistency in meditation duration.
  • Extraneous: Previous meditation experience.
• Strengths and Weaknesses:
  • Strengths: Objective MRI data provide reliable results.
  • Weaknesses: Small sample size limits wider applicability.
• G.R.A.V.E. Analysis:
  • Generalizability: Moderate, mindfulness widely practiced.
  • Reliability: High; MRI results can be replicated.
  • Applicability: Potential therapeutic uses in mental health.
  • Validity: High internal validity from precise measurements.
  • Ethical: Minimal risks from non-invasive MRI procedures.

Cognitive Approach

4. Andrade (2010) – Doodling and Concentration

• Study Focus: Examined if doodling helps improve concentration during monotonous tasks.
• Findings: Doodlers recalled more details from a message compared to non-doodlers.
• Lead Investigator: Jackie Andrade.
• Sample Population: 40 participants (18 men, 22 women) via opportunity sampling.
• Aim: Investigate if doodling aids concentration.
• Hypothesis: Doodling enhances recall.
• Variables:
  • IV: Doodling status during listening.
  • DV: Amount of information recalled.
  • Controlled: Message content and duration.
  • Extraneous: Differences in attention spans.
• Strengths and Weaknesses:
  • Strengths: High control over extraneous variables.
  • Weaknesses: Limited demographic diverseness.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited by sample size and demographics.
  • Reliability: High due to standardized methods.
  • Applicability: Important for educational concentration strategies.
  • Validity: High internal validity.
  • Ethical: Minimal; participants were debriefed.

5. Baron-Cohen et al. (2001) – Theory of Mind (Eyes Test)

• Study Focus: Investigated deficits in theory of mind using the "Reading the Mind in the Eyes" Test.
• Findings: Individuals with autism scored lower than controls on emotion interpretation from eye regions.
• Lead Investigator: Simon Baron-Cohen.
• Sample Population: 76 adults (16 with autism, 50 neurotypical, 10 with Tourette syndrome) via opportunity sampling.
• Aim: Analyze theory of mind abilities in autism spectrum disorders.
• Hypothesis: Autistic individuals will score lower on the Eyes Test.
• Variables:
  • IV: Autism diagnosis (autism, Asperger syndrome, neurotypical).
  • DV: Scores on the Eyes Test.
  • Controlled: Test format and visual stimuli.
  • Extraneous: Differences in emotional intelligence.
• Strengths and Weaknesses:
  • Strengths: High control of extraneous variables.
  • Weaknesses: Limited to high-functioning autistic individuals.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited to high-functioning autism.
  • Reliability: High; standardized testing protocols.
  • Applicability: Key for social understanding of autism.
  • Validity: High internal validity.
  • Ethical: Sensitive handling of vulnerable participants.

6. Pozzulo et al. (2011) – Line-Ups Study

• Study Focus: Examined the reliability of eyewitness testimony among children in police line-ups.
• Findings: Children were more prone to false positives compared to adults.
• Lead Investigator: Dr. Joan Pozzulo.
• Sample Population: 112 individuals (59 children aged 4-7, 53 adults aged 17-30) via opportunity sampling.
• Aim: Investigate eyewitness memory reliability, especially in children.
• Hypothesis: Children make more false positive identifications.
• Variables:
  • IV: Line-up type (target-present vs. target-absent).
  • DV: Accuracy of identification.
  • Controlled: Line-up procedures.
  • Extraneous: Participant stress or legal system familiarity.
• Strengths and Weaknesses:
  • Strengths: High control over experimental conditions.
  • Weaknesses: Limited ecological validity due to lab setting.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited to children and young adults.
  • Reliability: High; procedures easily replicated.
  • Applicability: Crucial for forensic psychology.
  • Validity: High internal validity.
  • Ethical: Informed consent was obtained; care taken to minimize stress.

Learning Approach

7. Bandura et al. (1961) – Aggression - (The Bobo Doll Experiment)

• Study Focus: Investigated how children imitate aggressive behaviors observed in adult role models.
• Findings: Children exposed to aggressive behavior towards a Bobo doll later exhibited aggression towards the doll.
• Lead Investigator: Albert Bandura.
• Sample Population: 72 children (36 boys, 36 girls) aged 3-6 via opportunity sampling.
• Aim: Identify if aggressive behavior can be learned through observation.
• Hypothesis: Children exposed to aggressive models will show higher aggression levels.
• Variables:
  • IV: Behavior of adult model (aggressive vs. non-aggressive).
  • DV: Aggressive behavior exhibited by children.
  • Controlled: Environment and exposure duration.
  • Extraneous: Children’s previous experiences with aggression.
• Strengths and Weaknesses:
  • Strengths: High control of extraneous variables.
  • Weaknesses: Low ecological validity; not representative of real-life interactions.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited to young children.
  • Reliability: High; findings replicated multiple times.
  • Applicability: Significant implications for understanding media influence.
  • Validity: High internal validity.
  • Ethical: Concerns around exposing children to aggression; documented no long-term harm.

8. Fagen et al. (2014) – Elephant Learning

• Study Focus: Examined the use of positive reinforcement in training elephants.
• Findings: Elephants performed tasks more effectively with rewards.
• Lead Investigator: Julie Fagen.
• Sample Population: 14 Asian elephants via opportunity sampling.
• Aim: Investigate how positive reinforcement influences elephants’ task performance.
• Hypothesis: Elephants with reinforcement will perform tasks better.
• Variables:
  • IV: Type of reinforcement (positive vs. no reinforcement).
  • DV: Task performance metrics.
  • Controlled: Task difficulty and consistency of rewards.
  • Extraneous: Individual elephant differences.
• Strengths and Weaknesses:
  • Strengths: High ecological validity.
  • Weaknesses: Limited to elephants; findings may not apply to other species.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited to working elephants.
  • Reliability: High; repeatable methodology.
  • Applicability: Relevant for humane animal training practices.
  • Validity: High due to naturalistic settings.
  • Ethical: Minimal concerns; humane methods employed.

9. Saavedra & Silverman (2002) – Button Phobia

• Study Focus: Case study of a boy with severe button phobia treated with exposure therapy.
• Findings: Therapy significantly reduced the boy’s phobic symptoms.
• Lead Investigators: Luz Maria Saavedra and Wendy Silverman.
• Sample Population: One 9-year-old boy via purposive sampling.
• Aim: Explore exposure therapy’s effectiveness in treating phobias.
• Hypothesis: Cognitive restructuring combined with exposure therapy will yield better results.
• Variables:
  • IV: Type of therapy (exposure with and without cognitive restructuring).
  • DV: Reduction in phobic symptoms.
  • Controlled: Therapy procedures.
  • Extraneous: Previous phobic experiences.
• Strengths and Weaknesses:
  • Strengths: Detailed case monitoring offers rich data.
  • Weaknesses: Limited generalizability due to single-case study approach.
• G.R.A.V.E. Analysis:
  • Generalizability: Low due to case study limitations.
  • Reliability: Low; challenging to replicate identically.
  • Applicability: High relevance to treating specific phobias.
  • Validity: High internal validity from clinical monitoring.
  • Ethical: Parental consent and monitoring ensured ethical conduct.

Social Approach

10. Milgram (1963) – Obedience to Authority

• Study Focus: Explored the extent to which individuals obey authority.
• Findings: Participants delivered shocks to a learner at the instruction of an experimenter, even under distress, revealing a tendency to obey authority.
• Lead Investigator: Stanley Milgram.
• Sample Population: 40 male participants aged 20-50 via volunteer sampling.
• Aim: Investigate obedience to authority figures.
• Hypothesis: Participants will continue administering shocks due to authority influence.
• Variables:
  • IV: Presence of an authority figure (experimenter).
  • DV: Level of obedience (maximum voltage delivered).
  • Controlled: Standardized conditions and environment.
  • Extraneous: Individual personality traits.
• Strengths and Weaknesses:
  • Strengths: High controlled environment increases validity.
  • Weaknesses: Ethical concerns regarding distress and deception.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited to male subjects but has been replicated.
  • Reliability: High; findings consistent across studies.
  • Applicability: Insightful for understanding authority dynamics.
  • Validity: High internal validity due to control.
  • Ethical: Concerns of deception; participants were debriefed.

11. Perry et al. (2015) – Personal Space

• Study Focus: Investigated how oxytocin affects perceptions of personal space.
• Findings: Administration of oxytocin reduced personal space for participants.
• Lead Investigator: Anat Perry.
• Sample Population: 54 male undergraduates expressing healthy psychological backgrounds via volunteer sampling.
• Aim: Understand oxytocin’s effect on social behavior.
• Hypothesis: Oxytocin will decrease personal space allowances.
• Variables:
  • IV: Oxytocin vs. placebo administration.
  • DV: Personal space preferences (distance maintained).
  • Controlled: Environment size and interaction conditions.
  • Extraneous: Participant differences in personality or culture.
• Strengths and Weaknesses:
  • Strengths: Double-blind design reduces participant bias.
  • Weaknesses: Limited to young healthy males restricts applicability.
• G.R.A.V.E. Analysis:
  • Generalizability: Limited to young undergraduates.
  • Reliability: High through replicable processes.
  • Applicability: Valuable insights on social bonding behaviors.
  • Validity: High internal validity.
  • Ethical: Minimal risk ensured by double-blind methods.

12. Piliavin et al. (1969) – Subway Samaritans

• Study Focus: Examined bystander behavior responses in emergencies within a natural setting.
• Findings: Factors such as victim condition affected bystander help, highlighting social context influence on prosocial behavior.
• Lead Investigators: Irving Piliavin, Judith Rodin, and Jane Piliavin.
• Sample Population: 4,450 subway passengers with opportunity sampling.
• Aim: Investigate factors influencing bystander intervention during emergencies.
• Hypothesis: People are more likely to help a disabled individual than a drunk individual.
• Variables:
  • IV: Victim condition (drunk vs. disabled) and other factors like race.
  • DV: Rate of helping behavior and response speed from bystanders.
  • Controlled: Environmental conditions and confederate behavior.
  • Extraneous: Variations in bystanders’ individual differences.
• Strengths and Weaknesses:
  • Strengths: Large sample size enhances generalizability.
  • Weaknesses: Ethical issues regarding lack of informed consent.
• G.R.A.V.E. Analysis:
  • Generalizability: High due to diverse sample.
  • Reliability: High; repeated trials revealed consistent findings.
  • Applicability: Essential for understanding public prosocial behaviors.
  • Validity: High internal validity.
  • Ethical: Consent issues due to covert observation in public settings.

Issues and Debates

• Dement & Kleitman: Nature vs. Nurture - Biological focus on dreaming. Ethical concerns minimal.
• Hassett et al.: Nature vs. Nurture - Highlights biological influences on gender behavior.
• Hölzel et al.: Nature vs. Nurture - Mindfulness (nurture) alters brain (nature).
• Andrade: Nature vs. Nurture - Task environment shows nurture influence.
• Baron-Cohen et al.: Nature vs. Nurture - Autism reflects interaction of biological and experiential factors.
• Pozzulo et al.: Nature vs. Nurture - Memory performance shaped by environmental influences.
• Bandura: Nature vs. Nurture - Social learning emphasizes nurture.
• Fagen et al.: Nature vs. Nurture - Reinforcement influences behavior (nurture).
• Saavedra & Silverman: Nature vs. Nurture - Treatment demonstrate learned behaviors altered through nurture.
• Milgram: Nature vs. Nurture - Obedience results from nurtured authority influence.
• Perry et al.: Nature vs. Nurture - Oxytocin, a biological factor, influences social behavior (nature).
• Piliavin et al.: Nature vs. Nurture - Helping behavior affected by contextual influences (nurture).