Ch. 1 & 2 Study Notes: Foundations, Methods, and the Scientific Approach to Psychology

Psychology has deep historical roots linking physiology and philosophy.
Ancient Greeks contributed foundational ideas that shaped early thinking about mind and behavior:
- Hippocrates (ca. 460–377 BCE): proposed the first psychological theory based on humours.
- Plato (ca. 427–347 BCE): suggested the mind is imprinted with all knowledge at birth.
- Aristotle (ca. 384–322 BCE): argued knowledge is gained through experience.
Think-Pair-Share prompt (from page 3):
- Think of one psychological ability you believe we are born with, and one you learn from experience.
Neolithic Revolution (~10,000 BCE) mentioned as a broad historical anchor in the slide sequence linking ancient roots to later psychology.
The idea that psychology’s roots span myth, ritual, and early philosophy, leading to later scientific approaches.

Concept: Psychology’s ideas have ancient origins but are pursued with modern scientific methods.
Emphasis on scientific methods and empirical investigation to study behavior and mental processes.

Rene Descartes (1596–1650):
- Key figure in modern philosophy and science.
- Advocate of rational examination: never accept something as true unless it is clearly and distinctly certifiable.
- Mind-body dualism: the mind and body are distinct substances.
- Famous proposition: "I think, therefore I am" (cogito ergo sum).
Mind-body dualism concept and its influence on later psychology.

Johannes Müller (1801–1858): argued for studying psychological effects of physical stimuli.
Hermann von Helmholtz (1821–1894): measured the speed of neural impulse.
Gustav Fechner (1801–1887): formulated psychophysics relationship: $S = k \log R$ where S is subjective sensation, R is stimulus intensity, and k is a constant.
Charles Darwin (1809–1882): natural selection theory; adaptive variations explain psychological and behavioral traits.

Wilhelm Wundt (1832–1920): opened the first psychology laboratory in 1879 in Leipzig, Germany; established psychology as a science through empirical experimentation.
Edward Titchener (1867–1927): brought Wundt’s ideas to the USA and helped develop Structuralism.
Structuralism:
- Goal: identify the smallest elements of consciousness.
- Method: introspection—careful, reflective, and systematic observation of mental processes.

Emphasized the importance of observable events as the focus of psychological science.
Advocated building up from simple elements to explain complex experiences.

William James (1842–1910):
- Established the first psychology lab in the USA (Harvard) and authored the influential Principles of Psychology (1890).
- Opposed structuralism; argued that mental processes are fluid, described as the "stream of consciousness".
- Focus on the function of mental processes and behaviors.
Functionalism: mental processes serve a function that helps individuals adapt to changing environments.

Key figures: Max Wertheimer (1880–1943), Kurt Koffka (1886–1941), Wolfgang Köhler (1887–1967).
Core idea: Consciousness cannot be reduced to elements; describe experiences as wholes (phenomenology).
Principle: The whole is greater than the sum of its parts.
Example context: Phi phenomenon demonstrations illustrating holistic perception.

Illusions used to illustrate Gestalt principles (Phi phenomenon) are referenced with a figure and sources in the slides.
These illustrate how perception is organized into meaningful wholes rather than just a sum of parts.

Although easy to conceptualize in perception, Gestalt ideas extend to other domains; invites consideration of when holistic processing applies to psychology and when it may not.

Attend Thursday Workshops; opt-out decisions for textbook DTA; sign up for ColNotes and PeerWise.
Read Chapter 2 and Appendix B; we will preview Ch. 2.
Important dates:
- Sep 11: Mandatory in-person reflective writing workshop;
- Sep 11: Reflection #1 due;
- Sep 18: Assignment #1 due;
- Sep 25: Quiz #1;
- Oct. 9: Midterm.

Chapter 2 + Appendix B are the focus for the science of psychology.
Learning objectives:
- Identify the core beliefs of science and the steps of the scientific method.
- Determine what makes psychology a science (versus other natural sciences).
- Learn how psychology research is conducted.
- Begin to understand how statistics are used to tell the story.

Key ideas:
1) The universe operates according to natural laws.
2) Those laws are discoverable and testable.

Deductive reasoning vs. inductive reasoning.
Hypothetico-deductive reasoning involves forming a theory, deriving hypotheses, and testing them via observations/experiments.
Structure (as depicted):
- Theory → Observation/Experiment → Hypothesis → Predictions → Observation/Experiment → Theory (cycle).
Hypothesis testing outcomes:
- Hypothesis supported or not supported; theory may be built or revised.

Psychology uses the scientific method to study human behavior and mental processes.
Distinction from pseudopsychology/pseudoscience: emphasis on empirical testing and falsifiability.
Psychology’s subject matter differs from other physical sciences; findings often touch on philosophical issues.

A hypothesis must state a testable prediction and be falsifiable (only two possible outcomes: true or false).
It specifies how the independent variable (IV) is expected to affect the dependent variable (DV).
Key definitions:
- Variable: a condition, event, or situation studied.
- Independent variable (IV): the variable that the researcher manipulates.
- Dependent variable (DV): the variable that is measured or that changes in response to the IV.

Example 1: Daily exposure to a sun lamp (1 hour vs. none) and winter depression levels.
Example 2: Watching aggressive TV cartoons and a child’s aggressive behavior.
Example 3: Amount of time spent reading the textbook (every day vs. once a week vs. none) and exam performance.

Operationalization links hypotheses to measurement: how a variable is defined and measured in the study.
Operational definition: the specific procedure or measurement used to represent a variable.
Variables (often psychological constructs) can be operationalized in many ways.
Examples to define operationally:
- Shyness
- Love
- Memory loss
Note: The slides indicate that these definitions can be approached in multiple valid ways; there is no single universal operationalization.

The discussion of operationalization and related topics continues in the next session (Sept 16).