2.14 Study Notes

The Scientific Method in Psychological Research

• Psychologists utilize the scientific method as a structured, cyclical process to systematically examine human behavior and mental processes.

• The scientific method operates as a continuous loop involving the following sequential stages:

  • Observation: Identifying a phenomenon or behavior in the environment.

  • Question: Formulating a specific inquiry based on initial observations.

  • Hypothesis: Developing a testable, tentative prediction or explanation.

  • Experiment: Designing and conducting a study to collect empirical data.

  • Analysis: Evaluating and interpreting the collected data using statistical tools.

  • Conclusion: Drawing inferences from the findings, which leads back to refined observations and further questioning.

Descriptive and Observational Research Designs

• Case Study:

  • Definition: A detailed, in-depth analysis of a specific individual, group, business, or event.

  • Primary Goal: To thoroughly describe and understand rare, unique, or complex phenomena that cannot be easily recreated in a laboratory setting.

  • Detailed Example:

  • Subject: Ted Bundy, one of America's most notorious serial killers, who murdered at least $30$ women and was executed in $1989$.

  • Evaluation: Dr. Al Carlisle evaluated Bundy upon his initial arrest to perform a psychological analysis of how his sexual fantasies gradually merged into reality.

  • Theoretical Framework: Carlisle posited that Bundy's actions were guided by a gradual three-process evolution consisting of:

    1. Fantasy

    2. Dissociation

    3. Compartmentalization

  • Reference: Details regarding this evaluation are expanded upon in Imagining Ted Bundy (Ramsland, $2012$).

• Naturalistic Observation:

  • Definition: A qualitative research strategy where a researcher unobtrusively observes and collects data on participants in their natural environment without their awareness.

  • Primary Goal: To record true, uninhibited behaviors free from observer bias, participant reactivity, or external laboratory influences.

  • Detailed Example:

  • Study: Conducted by Drain and Engelhardt ($2013$).

  • Sample: $6$ nonverbal children diagnosed with autism who attended a specialized school for autism across different classrooms.

  • Procedure: Each child was observed unobtrusively for $30\,\text{minutes}$ during each school day.

  • Outcome: Researchers gathered authentic data on both evoked and spontaneous communicative acts without introducing artificial environmental changes.

• Survey Research:

  • Definition: A quantitative or qualitative approach where participants respond to structured questions, questionnaires, or formal assessments to report information about themselves.

  • Primary Goal: To efficiently collect self-reported data from individuals regarding attitudes, behaviors, demographics, or traits.

  • Detailed Example:

  • Educational psychologists present surveys to students requesting them to report their Grade Point Average (GPA) alongside their typical daily breakfast consumption habits.

  • Supporting Finding: DiGangi ($1999$) demonstrated that eating a healthy breakfast is positively associated with superior academic performance.

Archival Research and Temporal Research Designs

• Archival Research:

  • Definition: A method in which researchers analyze existing records or datasets that were originally collected by other entities for non-research or distinct research purposes.

  • Primary Goal: To detect patterns, trends, or relationships across historical or large-scale data without requiring new primary data collection.

  • Detailed Example:

  • Study: Conducted by Anderson ($1987$) to investigate the connection between uncomfortably high temperatures and aggressive human behavior using historical crime statistics across two studies comparing violent and nonviolent offenses.

  • Hypothesis: Building upon prior work by Anderson and Anderson ($1984$), it was hypothesized that violent crimes would occur at higher frequencies during hotter seasons of the year and during years experiencing higher overall average temperatures.

  • Outcome: Archival data confirmed that violent crimes increased during hotter weather periods.

• Longitudinal Study:

  • Definition: An observational research design in which a single cohort or sample of participants is tracked and repeatedly assessed over an extended period of time.

  • Primary Goal: To observe changes, developmental trajectories, and long-term correlations within the same group as they age.

  • Detailed Example:

  • Study: Conducted by Eron and colleagues ($1972$).

  • Sample: A representative sample consisting of $856$ children.

  • Procedure: Researchers initially assessed the children at age $8$ regarding their media violence exposure and tracked them over a span of $10$ years.

  • Outcome: A statistically significant relationship was found between a boy's exposure to media violence at age $8$ and his displayed level of aggressive behavior $10$ years later following high school graduation.

• Cross-Sectional Study:

  • Definition: An observational study design in which data is collected simultaneously from distinct subgroups of participants (often stratified by age) at a single point in time.

  • Primary Goal: To compare variations between different age groups or cohorts without waiting for subjects to age over time.

  • Detailed Example:

  • Study: Conducted by Russell ($1996$).

  • Procedure: Surveyed participants spanning multiple distinct age demographics simultaneously.

  • Outcome: Individuals in their $20\text{s}$ reported experiencing significantly higher levels of loneliness compared to individuals in their $70\text{s}$.

Correlational and Experimental Research Designs

• Correlational Design:

  • Definition: A research design measuring two or more variables to evaluate whether a statistical relationship or association exists between them, without manipulating any variable or establishing causation.

  • Primary Goal: To identify predictive relationships between naturally occurring variables.

  • Detailed Example:

  • Study: Conducted by Thornhill et al. ($2003$).

  • Procedure: Participants rated the physical attractiveness of various individuals based on photographs. Separately, participants smelled t-shirts worn by those same individuals (without knowing which t-shirt belonged to whom) and rated the pleasantness of their body odor.

  • Outcome: A positive correlation was identified: individuals who were rated as more physically attractive also had their body odor rated as significantly more pleasant.

• Experimental Design:

  • Definition: A rigorous methodology where researchers create a strictly controlled environment to systematically manipulate at least one independent variable while holding confounding variables constant to observe the effect on a dependent variable.

  • Primary Goal: To establish definitive cause-and-effect relationships between variables by directly causing changes in one variable.

  • Detailed Example:

  • Clinical Application: Testing a novel pharmaceutical intervention for clinical depression.

  • Procedure: Clinical psychologists randomly assign depressed patients to receive either the newly developed drug or an established, thoroughly tested antidepressant medication.

  • Outcome: Comparing treatment outcomes between controlled groups allows researchers to directly isolate and determine which drug represents the more effective treatment.