Source: General Psychology, The Ohio State University, Chapters 1–2
Tags: history of psychology, structuralism, functionalism, behaviourism, psychoanalysis, Gestalt, research methods, causation, correlation, Wundt, Descartes, Watson, Skinner, Freud
Difficulty: Introductory | Prerequisites: None
This material covers how psychology emerged as a scientific discipline, from its philosophical roots in dualism through to the major schools of thought (structuralism, functionalism, behaviourism, psychoanalysis, Gestalt). It also introduces research methodology: how experiments are designed, why correlation does not equal causation, and what can go wrong even when a study is well-intentioned. If you are coming in cold, this is the right starting point. Everything else in the course builds on the vocabulary and reasoning introduced here.
Psychology began as a branch of philosophy, became a laboratory science in the late 1800s, and then split into competing schools that each defined "what psychology should study" differently. Research methods matter because the way you collect and interpret data determines whether your conclusions hold up, and history is full of cautionary tales (New Coke, Clever Hans) where good procedures still led to wrong answers.
Dualism
The philosophical position that humans consist of a material body and an immaterial soul (or mind). The body can be studied scientifically; the soul, on this view, cannot. In simple terms, this means the mind and body are made of different stuff, and that distinction shaped centuries of debate about what science can and cannot investigate.
Structuralism
The school of thought, associated with Edward Titchener, holding that psychology's task is to break consciousness down into its basic elements (sensations, emotions, images) using introspection. Think of it as chemistry for the mind: identify each "element" of conscious experience and map how they combine.
Introspection
Careful, systematic self-observation of one's own conscious experience, performed by trained subjects. The primary method of structuralist research. In simple terms, this means looking inward and reporting exactly what you are experiencing, under controlled conditions.
Functionalism
The school of thought, associated with William James, that psychology should focus on the function or purpose of consciousness rather than its structure. Think of it as asking "what is consciousness for?" rather than "what is consciousness made of?"
Natural selection
Charles Darwin's theory that heritable traits providing a competitive advantage are more likely to be passed to the next generation, while less advantageous traits become extinct over time. In simple terms, organisms with useful traits survive and reproduce more, shaping what future generations look like.
Behaviourism
The school of thought, associated with John B. Watson and B.F. Skinner, that psychology should study only observable behaviour. Consciousness and perception are private events that cannot be objectively measured, so they should be set aside. Think of it as: if you cannot see it and measure it, it does not belong in science.
Stimulus
Any detectable input from the environment that an organism can respond to.
Response
Any overt, observable action or activity by an organism.
Gestalt psychology
The school holding that consciousness cannot be reduced to a set of elementary components. The whole is different from the sum of its parts. In simple terms, breaking experience into tiny pieces loses the meaning of the whole, so psychologists should study experience as a unified thing.
Psychoanalysis
The approach founded by Sigmund Freud, explaining personality, motivation, and mental disorders by focusing on unconscious determinants of behaviour. Think of it as: much of what drives you sits below the surface of awareness, in memories, desires, and thoughts you do not consciously access.
Unconscious
In Freud's framework, the collection of thoughts, memories, and desires that sit well below conscious awareness but still exert influence on behaviour.
Operant conditioning (Skinner)
The principle that organisms tend to repeat behaviours followed by positive outcomes and stop behaviours followed by negative outcomes. In simple terms, rewards make behaviour more likely; punishments make it less likely.
Correlation
A statistical relationship between two variables. Correlation does not equal causation: two things can move together without one causing the other.
Internal validity
The degree to which an experiment's design rules out alternative explanations, so you can confidently say the independent variable caused the change in the dependent variable.
External validity
The degree to which a study's findings generalise beyond the specific sample, setting, or conditions of the experiment.
Interrater reliability
The extent to which independent observers agree in their measurements or coding of the same behaviour.
Double-blind experiment
An experimental design in which neither the participants nor the experimenters interacting with them know who is in the experimental group and who is in the control group. Reduces bias from expectations.
Wilhelm Wundt
Opened the first university-based psychology laboratory (Leipzig, 1879)
Wrote the first psychology textbook, trained the first graduate students in the field
Applied the scientific method to psychology
His work focused on consciousness, defined as awareness of immediate experience
Rene Descartes
A dualist: believed in a material body and an immaterial soul
Argued that complex behaviours can occur through purely mechanical means, without the soul's involvement
Proposed that any activity performed by humans is no different from the behaviour of a nonhuman animal and can therefore occur without the soul
Identified thought as the one ability unique to humans and the only function of the soul
Even claimed the soul acts at a specific physical location (the pineal gland)
His recognition that the body could do things without the soul opened the door for Thomas Hobbes and later materialists
Limitation: if the soul is non-material, how does it act on a material body? This remains the central problem for dualism
G. Stanley Hall
Brought the science of psychology to America
Founded the American Psychological Association (APA)
Edward Titchener – Structuralism
Believed psychology's task was to analyse consciousness into its basic elements and study how they relate
Elements included sensation, emotion, and mental images
Method: introspection by trained subjects
Limitation: relies on subjective self-report, difficult to verify or replicate
William James – Functionalism
Argued psychology should study the function or purpose of consciousness, not its structure
Influenced by Darwin's theory of natural selection
Functionalists worked in the laboratory, focusing on sensation and perception
Took the field in new directions: mental testing, education, adolescent development
Charles Darwin
Theory of natural selection: heritable traits that confer an advantage are passed on; disadvantageous traits die out
Functionalists applied this to humans: by studying what consciousness does for us, we discover how it works
John B. Watson – Behaviourism
Argued that science should study only observable behaviour
Consciousness and perception are private events, cannot be objectively studied, and would cause psychology to suffer from a lack of reliability
Sparked the nature vs. nurture debate, with heavy emphasis on the stimulus-response model
Behaviour: any overt, observable response by an organism
Stimulus: any detectable input from the environment
Gestalt Psychology
Held that consciousness cannot be reduced to elementary components
The whole experience is different from the sum of its parts
Sigmund Freud – Psychoanalysis
Worked with people who had psychological problems; developed a theory centred on the unconscious
The unconscious is the collection of thoughts, memories, and desires below conscious awareness that still influence behaviour
Psychoanalytic theory explains personality, motivation, and mental disorders by focusing on unconscious determinants of behaviour
B.F. Skinner – Radical Behaviourism
Extended behaviourism's influence
Discovered the principle of operant conditioning: organisms repeat responses followed by positive stimuli and stop repeating responses followed by negative ones
Influenced behaviour modification in schools, prisons, and other settings
Argued that all behaviour is determined by external stimuli, raising the question of whether free choice exists
1. Behaviour as a response to stimuli
Someone shouts at you and you shout back; someone insults you and you react physically
The emphasis is on the external event that triggers the behaviour
2. Behaviour caused by physiological processes of the nervous system
A brain tumour alters personality or judgement
A mental disorder rooted in neurochemistry changes how a person acts
The emphasis is on biological mechanisms
3. Behaviour caused by an individual's conscious, phenomenological experience of the environment
Emotions such as anger, sadness, or hunger drive behaviour
The emphasis is on subjective internal states and how a person interprets the world around them
To infer that one variable causes a change in another, you need:
A random, sufficiently large sample
Both an experimental group and a control group
Manipulation of the independent variable while controlling for confounding variables
Internal validity (no systematic bias)
External validity (results generalise beyond the lab)
Reliable and valid measures
Interrater reliability (independent observers agree)
Why correlation is not causation
The direction of the relationship may be ambiguous (does A cause B, or B cause A?)
A third variable may explain both A and B
Without an experiment, you cannot rule out these alternative explanations
Causal evidence requires:
Random assignment to conditions
A proper control group
Data that supports the conclusion drawn
The New Coke Disaster
Background: in blind taste tests comparing Pepsi and Coke, the difference in preference was small. In one-sip blind experiments, more people preferred "New Coke."
What they did right: conducted blind and double-blind experiments; the data supported the conclusion that people preferred the taste of New Coke in a single sip.
What went wrong: a single sip is not the same as drinking an entire can. The study failed to account for context, expectations, and the full consumption experience. When New Coke launched, it was a disaster because people's real-world experience of drinking a whole can (with all their existing expectations about Coke) was nothing like a single blind sip.
Lesson: even a well-designed experiment can produce misleading conclusions if the conditions do not match the real-world situation.
Clever Hans
Hans was a horse owned by Wilhelm von Osten, who believed horses had the same intelligence as humans given the same education
Von Osten trained Hans in arithmetic, history, and other subjects. Hans answered questions by tapping his hoof to spell words, give numbers, or respond yes/no
No one could detect trickery, and many believed Hans had genuinely learned these subjects
Oskar Pfungst, a psychology student, investigated and hypothesised that Hans was responding to visual signals rather than knowledge
Pfungst found that Hans failed to answer correctly when fitted with blinders (so he could not see anyone) or when no one in the audience knew the answer
Hans had learned to start tapping when someone looked down at his hoof and to stop when they gave a subtle nod, smile, or shift in posture
These cues were given unconsciously by the questioner or audience members, and were so subtle that most people never noticed them
Lesson: experimenter bias (including unconscious facial cues and body language) can profoundly influence results. This is why blinding, double-blinding, and careful controls are essential in psychological research.
Students often confuse structuralism and functionalism. Structuralism asks "what are the parts?"; functionalism asks "what does it do?" They are different questions, not different answers to the same question.
"Behaviourism says the mind does not exist." Behaviourism does not deny the existence of consciousness. It argues that private mental events cannot be objectively studied and therefore should not be the focus of scientific psychology.
"Correlation means there is no relationship." Correlation does indicate a statistical relationship. The point is that it does not tell you which variable is causing the change, or whether a third variable explains both.
Students sometimes assume that if an experiment is double-blinded, its conclusions must be correct. The New Coke case shows that even properly blinded experiments can produce conclusions that fail in the real world if the experimental conditions do not match real-world use.
⚠️ Be able to name at least five founders of psychology and describe each one's contribution and school of thought. This is a direct exam question.
⚠️ Know the three types of explanations for behaviour and be ready to give two examples of each.
⚠️ Understand the conditions required to infer causality: random assignment, control group, internal validity, external validity, reliable and valid measures.
⚠️ Be able to explain why correlation does not equal causation, with reference to ambiguous direction and third-variable problems.
⚠️ The New Coke and Clever Hans cases are almost certainly on the exam. Know what went right, what went wrong, and the methodological lesson each teaches.
True or False: Wilhelm Wundt is considered the founder of behaviourism.
Fill in the blank: The school of thought that analyses consciousness into its basic elements is called __________.
True or False: A correlation between two variables proves that one causes the other.
Fill in the blank: Clever Hans responded to unconscious __________ from the questioner, not to actual knowledge.
True or False: In the New Coke study, the blind taste tests were poorly designed.
Answers: 1. False (Wundt is the founder of experimental psychology; Watson founded behaviourism). 2. Structuralism. 3. False. 4. Visual signals / cues. 5. False (the tests were well-designed; the problem was ecological validity).
Q: Name five individuals who had an impact on the history of psychology and describe their contributions.
A: Wundt (first psychology lab, scientific method applied to consciousness), Descartes (dualism, mechanical explanation of behaviour), Titchener (structuralism, introspection), James (functionalism, purpose of consciousness), Watson (behaviourism, observable behaviour only). Others to know: Hall (APA), Darwin (natural selection), Freud (psychoanalysis, unconscious), Skinner (operant conditioning), Gestalt psychologists (the whole is not reducible to parts).
Q: Describe three types of explanations for human behaviour and give two examples of each.
A: (1) Response to stimuli: someone yells at you and you yell back; someone insults you and you react physically. (2) Physiological processes: a brain tumour alters behaviour; a neurochemical disorder changes mood. (3) Conscious experience of the environment: anger prompts aggression; hunger prompts eating.
Q: Under what conditions can you infer causality in a psychological experiment?
A: You need random assignment to experimental and control groups, a large enough sample, manipulation of the independent variable, internal validity (no confounds), external validity (results generalise), and reliable, valid measures. Correlation alone is insufficient because of ambiguous direction and potential third variables.
Q: What went right and what went wrong with the New Coke research?
A: The researchers correctly used blind and double-blind taste tests. The data genuinely supported the finding that people preferred New Coke in a single sip. The conclusions went astray because a one-sip test does not capture the full experience of drinking an entire can, nor the consumer's expectations and emotional attachment to the original product.
Q: What lesson does Clever Hans provide for psychological research?
A: Clever Hans appeared to have learned arithmetic and language, but was actually reading subtle, unconscious visual cues from the questioner and audience. The lesson: experimenter bias and demand characteristics can produce results that look genuine but are artefacts of the testing situation. Blinding, control groups, and eliminating unintentional cues are essential.
This material connects directly to the neuroscience chapters (Ch. 5), because understanding the biological basis of behaviour is one of the three types of explanation introduced here. The research methods principles apply to every study discussed in the rest of the course, including the genetics and heritability experiments in Chapter 3. The nature-vs.-nurture debate sparked by behaviourism runs through the genetics and motivation material covered later.
psychology history, schools of thought in psychology, Wundt lab, Descartes dualism, mind-body problem, Titchener structuralism, introspection method, William James functionalism, Darwin natural selection, Watson behaviourism, stimulus-response, Gestalt whole, Freud unconscious, psychoanalytic theory, Skinner operant conditioning, behaviour modification, correlation vs causation, internal validity, external validity, double-blind experiment, New Coke taste test, Clever Hans horse, experimenter bias, demand characteristics, Oskar Pfungst, research design psychology, control group, random assignment, interrater reliability, ecological validity