Chapter 0: Introduction to Psychology

Definition and Origins of Psychology

Psychology is the scientific study of behavior and mental processes. The term "psychology" is derived from the Greek words psyche (soul or mind) and logos (study of). Psychology evolved from philosophy and became a scientific discipline in the late 19th century.

• Behavior: Observable actions of humans and animals.

• Mental Processes: Internal experiences such as thoughts, feelings, and motives.

Additional info: Psychology uses empirical methods to study both behavior and mental processes.

Early Schools of Thought

• Structuralism (Wilhelm Wundt):

  • Established the first psychology lab in 1879 (University of Leipzig).

  • Emphasized analyzing the basic elements of conscious experience.

  • Used introspection as a method.

  • Goal: Break down mental processes into their most basic components.

• Functionalism (William James):

  • Influenced by Darwin’s theory of evolution.

  • Focused on the function and purpose of behavior and mental processes.

  • Interested in how consciousness was adaptive and could not be broken down.

• Psychoanalysis (Sigmund Freud):

  • Emphasized the role of the unconscious mind in influencing behavior.

  • Unconscious conflicts, often from childhood, drive behavior.

  • Developed ideas like the id, ego, superego; defense mechanisms.

• Behaviorism (John Watson & B.F. Skinner):

  • Focused on observable behavior.

  • Emphasized learning through conditioning.

  • Watson: Little Albert study (classical conditioning).

  • Skinner: Operant conditioning (rewards and punishments).

• Humanistic Psychology (Carl Rogers, Abraham Maslow):

  • Emphasized free will, personal growth, and self-actualization.

  • People are inherently good and capable of making rational choices.

The Big Themes of PSY 101

1. Both Nature and Nurture matter – genetic inheritance and environmental experiences both shape behavior.

2. Behavior is Multivariate – many causes contribute to behavior and mental processes.

3. People Vary – individual differences matter.

4. Psychology is a Science – based on empirical methods and research.

Great Debates in Psychology

• Nature vs. Nurture:

  • Nature (Nativism): Behavior is primarily the result of genetic inheritance.

  • Nurture (Empiricism): Behavior is shaped by experience and environment.

  • Most modern psychologists agree both play crucial roles.

Subfields of Psychology

• Clinical Psychology: Studies, diagnoses, and treats mental disorders.

• Counseling Psychology: Helps with coping and life transitions.

• Developmental Psychology: Studies growth and changes across lifespan.

• Cognitive Psychology: Examines internal mental processes.

• Biopsychology/Neuroscience: Studies brain, biology, and behavior.

• Social Psychology: Explores how individuals influence and are influenced by others.

• Industrial/Organizational Psychology: Applies psychology to the workplace.

• Educational/School Psychology: Learning, teaching, and assessment.

Table: Comparison of Early Schools of Thought

Example: Classical Conditioning

In Watson’s Little Albert study, a child was conditioned to fear a white rat by pairing the rat with a loud noise. This demonstrated how emotional responses can be learned through association.

Example: Freud’s Structure of Personality

• Id: Primitive drives and instincts.

• Ego: Rational part that mediates between id and reality.

• Superego: Moral standards and ideals.

Key Formula: Heritability

Heritability estimates the proportion of variation in behavior attributable to genetic factors:

where is heritability, is genetic variance, and is total phenotypic variance.

Additional info: These foundational concepts set the stage for further study in research methods and biological bases of behavior, which are covered in subsequent chapters.