Notes on Psychology's Foundations and Research Methods

Psychology's Roots

  • Definition of Psychology

    • Psychology is the scientific study of behavior and mental processes.
    • Behavior: Outward, overt actions and reactions.
    • Mental Processes: Internal, covert activities of our minds.

  • Purpose: Psychology uses scientific tools to describe, explain, predict, and control behavior and mental processes.

Structuralism and Introspection

  • Structuralism: An early school of psychology that used introspection to explore the structural elements of the human mind.
    • Introspection: The process of objectively examining and measuring one’s own thoughts and mental activities.
    • Declined in the early 1900’s due to its unreliability.
    • Still relevant in psychotherapy today.

The Biopsychosocial Approach

  • A combined approach to understanding psychological phenomena, evaluating:
    • Biological influences:
    • Genetic predispositions.
    • Genetic mutations.
    • Natural selection.
    • Genes responding to the environment.
    • Psychological influences:
    • Learned fears and expectations.
    • Emotional responses.
    • Cognitive processes.
    • Social-Cultural influences:
    • Presence of others.
    • Cultural and societal expectations.
    • Peer influences, including media.

Modern Perspectives in Psychology

  • Psychodynamic Perspective:

    • Focuses on the unconscious mind and its influence on conscious behavior.
    • Emphasizes early childhood experiences and the development of self.
    • Founded by Sigmund Freud, using psychoanalysis.

  • Behavioral Perspective:

    • Focuses on observable behavior, disregarding consciousness.
    • B.F. Skinner’s operant conditioning explains how behavior is learned via rewards and punishments.
    • Changing behavior requires reconditioning.

  • Humanistic Perspective:

    • Emphasizes free will and human nature.
    • Pioneers: Abraham Maslow (self-actualization) and Carl Rogers.
    • Incorporates aspects of Positive Psychology movement.

  • Cognitive Perspective:

    • Focuses on mental processes: thinking, perception, memory, intelligence.
    • Cognitive neuroscience studies physical changes in the brain.

  • Socio-Cultural Perspective:

    • Examines how social behavior and culture influence behavior.
    • Cross-cultural research studies behaviors across different cultures.

  • Biological (Neuroscience) Perspective:

    • Links behavior to biological processes (hormones, heredity, brain chemistry).

  • Evolutionary Perspective:

    • Explores biological bases for universal mental traits based on Darwin’s natural selection theory.

Clinical Psychology vs. Psychiatry

  • Clinical Psychologist (Ph.D.): Studies and treats individuals using psychotherapy.
  • Psychiatrist (M.D.): Medical professional who may prescribe medications along with psychotherapy for clinical diagnosis.

Four Big Ideas in Psychology

  1. Critical Thinking is Smart Thinking.
  2. Behavior is a Biopsychosocial Event.
  3. We Operate with a Two-Track Mind (Dual Processing).
  4. Psychology Explores Human Strengths and Challenges.

Differentiating Opinion and Evidence

  • Critical thinking distinguishes between uninformed opinions and examined conclusions.
  • Psychology employs scientific methods for evidence-based understanding of thoughts, feelings, and behaviors.

Intuition and Common Sense in Psychology

  • Common belief: Intuition and common sense are sufficient for psychological understanding.
  • Reality: They often lead to errors in judgment (e.g., gut feelings in job interviews).

Key Errors of Common Sense

  • Example: Folding a piece of paper (0.1 mm thick) 100 times leads to absurd assumptions—about the resulting thickness.
  • Choice between a million dollars today vs. a penny doubling daily illustrates misconceptions in value over time.

Hindsight Bias

  • Defined as the “I-knew-it-all-along” effect.
  • People believe they could have predicted outcomes after they occur, e.g., financial market crashes.

Critical Thinking in Psychology

  • Critical thinking involves:
    • Asking questions
    • Defining terms
    • Examining evidence
    • Analyzing assumptions
    • Avoiding emotional reasoning
    • Considering alternative interpretations

Descriptive Methods in Psychology

  • Types of Descriptive Methods:
    • Case studies
    • Observational studies
    • Psychological tests
    • Surveys
  • Descriptive methods do not yield causal explanations and may not be replicable.

Case Study

  • A detailed examination of an individual or a group, can inform broader hypotheses
  • Limitations: Generalizability issues and potential bias.

Observational Studies

  • Objective observation without interference in behavior.
    • Naturalistic: Observing in natural environments.
    • Laboratory: Observing in controlled settings.

Surveys

  • Gather data regarding experiences, attitudes, or opinions.

    • Random sampling is vital for unbiased results.
    • Survey design affects outcomes (e.g., question wording, structure).

  • Social Desirability Bias: Participants provide what they perceive as socially acceptable answers.

Correlational Studies

  • Examines relationships between two variables:
    • Correlation coefficients range from -1.0 to +1.0, indicating strength and direction.
    • Positive correlation: Both variables increase together.
    • Negative correlation: One variable increases while the other decreases.

Correlation vs. Causation

  • Correlation does not imply causation.
  • Relationships among variables can be due to other factors (e.g., low self-esteem and depression).

Psychological Research Methods

  • Experimental Research: Investigates cause and effect by manipulating one or more independent variables while controlling for confounding variables.
    • Random assignment is essential to create comparable groups.

Key Terminology in Experiments

  • Independent Variable: The manipulated factor in an experiment.
  • Dependent Variable: The observed behavior or mental process affected by the independent variable.
    • Example: In sleep studies, sleep is independent, and reaction time is dependent.

Ethics in Psychological Research

  • Ethical considerations include:
    • Informed consent
    • Confidentiality
    • Right to discontinue
    • Debriefing after participation.

Statistical Analysis and Reporting

  • Measures of Central Tendency:
    • Mean, Median, and Mode.
  • Standard Deviation: Indicates score variability around the mean.
  • Inferential Statistics: Enables conclusions about the data’s significance and the null hypothesis.

Understanding P-Values

  • P-value assesses the likelihood of obtaining observed data under the null hypothesis. A lower p-value (< .05) indicates stronger evidence against the null hypothesis.

Conclusion

  • Psychology incorporates a combination of methodologies and perspectives to study the intricate aspects of behavior and mental processes, encouraging a rigorous analytical approach informed by ethical standards and scientific principles.