AP PSYCHOLOGY - UNIT 1
I. What Is Psychology?
Psychology
The scientific study of behavior and mental processes
Behavior = observable actions
Mental processes = thoughts, feelings, perceptions (not directly observable)
Goals of Psychology
Describe behavior
Explain behavior
Predict behavior
Influence or control behavior (ethically)
Psychology emphasizes scientific evidence, not opinions or intuition.
II. Philosophical Foundations of Psychology
Psychology originated from philosophy, particularly debates about the mind.
Key Philosophers
Socrates & Plato
Mind is separate from the body
Knowledge is innate
Aristotle
Knowledge comes from experience
Laid groundwork for empiricism
René Descartes
Dualism: mind and body are separate but interact
John Locke
Tabula rasa: mind is a blank slate at birth
Knowledge comes from experience
III. Birth of Modern Psychology
Wilhelm Wundt (1879)
Opened first psychology laboratory in Leipzig, Germany
Marked psychology’s transition into a scientific discipline
Used introspection: trained self-reflection on conscious experience
Structuralism
Associated with Edward Titchener
Goal: identify basic elements of consciousness
Relied heavily on introspection
Eventually declined due to subjectivity
Functionalism
Associated with William James
Focused on the purpose of thoughts and behaviors
Influenced evolutionary thinking
Emphasized adaptation and survival
IV. Major Psychological Perspectives
Psychologists explain behavior using different approaches.
1. Biological Perspective
Behavior results from biological processes
Focus on brain structures, neurotransmitters, hormones, genetics
2. Evolutionary Perspective
Behavior develops through natural selection
Focus on survival and reproductive advantages
3. Behavioral Perspective
Behavior is learned through interaction with environment
Focus on conditioning and reinforcement
Key figures: John Watson, B.F. Skinner
4. Cognitive Perspective
Focus on mental processes
Includes memory, thinking, problem solving, perception
5. Psychodynamic Perspective
Originated by Sigmund Freud
Emphasizes unconscious motives and early childhood experiences
6. Humanistic Perspective
Emphasizes free will and personal growth
Focus on self-concept and self-actualization
Key figures: Carl Rogers, Abraham Maslow
7. Sociocultural Perspective
Behavior influenced by culture, social norms, and group context
Biopsychosocial Approach
Integrates biological, psychological, and social influences
Most widely accepted modern framework
V. Nature vs. Nurture
Nature: genetic and biological influences
Nurture: environmental influences
Modern psychology recognizes interaction between both
VI. Scientific Method in Psychology
Psychology relies on systematic, objective research.
Theory
A broad explanation of behavior or mental processes
Hypothesis
A testable prediction derived from a theory
Operational Definition
Precise description of how variables are measured or manipulated
Ensures replication
VII. Research Methods
A. Descriptive Research Methods
Used to observe and describe behavior without manipulation.
Case Study
In-depth study of one individual or group
Strength: rich detail
Weakness: limited generalizability
Naturalistic Observation
Observing behavior in natural environment
Strength: real-world behavior
Weakness: observer bias, no control
Survey
Self-reported data from questionnaires or interviews
Strength: large amounts of data quickly
Weakness: response bias, wording effects
B. Correlational Research
Measures relationship between variables
Uses correlation coefficient (r) from −1 to +1
Shows strength and direction of relationship
Correlation does NOT imply causation
C. Experimental Research
Used to determine cause-and-effect relationships.
Key Components
Independent Variable (IV): manipulated variable
Dependent Variable (DV): measured outcome
Experimental Group: receives treatment
Control Group: does not receive treatment
Random Assignment: reduces confounding variables
VIII. Ethics in Psychological Research
Ethical guidelines protect participants.
Human Research Ethics
Informed consent
Right to withdraw
Protection from harm
Confidentiality
Debriefing
Animal Research Ethics
Humane treatment
Justified research purpose
Minimized suffering
IX. Biases in Research
Hindsight Bias: “I knew it all along”
Confirmation Bias: favoring information that supports beliefs
Scientific methods reduce bias and increase reliability
AP Psychology Unit 1 — Key Terms & Definitions (AMSCO)
Psychology
The scientific study of behavior and mental processes.
Behavior
Observable actions of humans or animals.
Mental Processes
Internal experiences such as thoughts, feelings, and perceptions.
Empiricism
The view that knowledge comes from experience and observation.
Introspection
A method of self-observation in which individuals report their conscious thoughts and feelings.
Structuralism
An early psychological approach that aimed to identify the basic elements of consciousness using introspection.
Functionalism
An early psychological approach that focused on the function and purpose of behavior and mental processes in helping organisms adapt.
Theory
A broad explanation that organizes observations and predicts behavior or mental processes.
Hypothesis
A testable prediction derived from a theory.
Operational Definition
A precise description of how a variable is measured or manipulated in a study.
Case Study
An in-depth investigation of a single individual, group, or event.
Naturalistic Observation
Observing and recording behavior in its natural environment without manipulation.
Survey
A research method that gathers self-reported data through questionnaires or interviews.
Correlation
A statistical relationship between two variables.
Correlation Coefficient
A numerical measure (r) that indicates the strength and direction of a relationship between two variables, ranging from −1 to +1.
Independent Variable (IV)
The variable that is deliberately manipulated by the researcher.
Dependent Variable (DV)
The variable that is measured and affected by changes in the independent variable.
Experimental Group
The group that receives the treatment or manipulation of the independent variable.
Control Group
The group that does not receive the treatment and serves as a comparison.
Random Assignment
Assigning participants to experimental or control groups by chance to reduce bias.
Nature vs. Nurture
The debate about whether behavior is influenced more by genetics (nature) or environment (nurture).
Biological Perspective
An approach that explains behavior in terms of brain processes, genetics, hormones, and nervous system activity.
Cognitive Perspective
An approach that focuses on mental processes such as thinking, memory, problem solving, and perception.
Behavioral Perspective
An approach that emphasizes how behavior is learned through conditioning and reinforcement.
Humanistic Perspective
An approach that emphasizes free will, personal growth, and self-actualization.
Psychodynamic Perspective
An approach that emphasizes unconscious motives, conflicts, and early childhood experiences.
Sociocultural Perspective
An approach that examines how behavior is influenced by social and cultural factors.
Biopsychosocial Approach
An integrated approach that considers biological, psychological, and social factors in explaining behavior.
Ethics
Moral principles that guide research practices to protect participants from harm.
Hindsight Bias
The tendency to believe, after learning an outcome, that one would have predicted it beforehand.