Notes on Why Science? (Diener)
What is Science?
Science is the use of systematic observation to acquire knowledge.
Contrast with magical or supernatural explanations; scientists seek to understand the natural world through testing and observation.
Example: in a science class, mixing vinegar and baking soda demonstrates a bubbly chemical reaction, illustrating empirical methods.
Science is not magic; it may not solve all problems or answer all questions about behavior, but it is the most powerful method we have for learning about the observable world.
The essential elements of science:
1) Systematic observation is the core of science. Scientists observe the world in an organized way, often measuring phenomena, recording observations to reduce memory biases, and observing under controlled conditions. They vary conditions to understand when phenomena occur.
2) Observation leads to hypotheses that can be tested. Hypotheses and theories are stated so they can be tested (e.g., comparing candle burning speeds between paraffin wax and bees wax).
3) Science is democratic. Modern science values skepticism, open debate, and publication of competing findings; the best data win.
4) Science is cumulative. Earlier discoveries are built upon to move knowledge forward (e.g., today a physics student knows more than Newton did).
Psychology as a science is discussed; early skepticism existed because many psychological phenomena (e.g., depression, intelligence, prejudice) are not directly observable.
Early psychologists focused on behavior as a proxy for mental states; by using behavioral measures and rating scales, researchers infer thoughts and feelings (similar to educators measuring performance or economists measuring quality of life).
Scientific Advances and World Progress
There are many notable contributors to human progress in modern times; the question of who helped humanity the most often highlights Jenner, Borlaug, and Haber, who are less well known than Mother Teresa or Albert Schweitzer.
Jenner (Edward Jenner) is considered the “father of immunology” for developing vaccinations; vaccines led to eradication of smallpox and greatly reduced diseases such as measles, pertussis, diphtheria, tetanus, typhoid, cholera, polio, hepatitis, etc. Vaccination saves millions of lives annually.
Haber and Borlaug saved more than a billion lives by enabling the Green Revolution: hybrid crops and synthetic fertilizers allowed food production to meet a growing population (~7 billion). Hunger today is linked more to politics and economics than to production capacity.
The graph of progress: Jenner’s vaccination impact is global and ongoing (e.g., widespread vaccination reduces disease spread).
[Image note: CDC Global Health graphic referenced in the original material; image credits provided in the transcript].
What Is Science in Historical Context?
Over the past century, most major social and technological changes are attributable to science.
1914 vs today: how the world differs
Cars were rare; travel by foot, horseback, or carriage.
Radios, televisions, birth control pills, artificial hearts, antibiotics did not exist.
Telephones, refrigeration, electricity were limited.
Today: about of households have television; have electricity.
About of the world’s population has mobile phone access.
Life expectancy: .
Malnutrition has declined globally; IQ levels have risen, in part due to better nutrition and schooling.
These medical advances and technological innovations are direct results of scientific research and understanding.
Science is powerful but can lead to complacency about its progress; the takeaway is that science has dramatically changed our world.
What is science? Ancient explanations often relied on magic; science relies on systematic testing and observation to understand natural phenomena.
Science is empirical and evidence-based; it uses observation to acquire knowledge about the physical and biological world.
Limitations: science is not a panacea; it may not answer every question about behavior, but it remains the most powerful method for understanding observable reality.
The Process of Science: Essential Principles
1) Systematic observation is the core of science. Observations are organized, measured, recorded to minimize memory biases, and conducted under controlled or varied conditions to map when phenomena occur.
2) Observations lead to hypotheses and testable claims. Example: testing whether paraffin wax candles burn more slowly than bees wax candles of the same size and shape.
3) Science is democratic. Skepticism, debate, and publication of competing findings are common; the best data win.
4) Science is cumulative. Knowledge builds on prior findings; later scientists often know more than earlier giants (e.g., Newton vs modern physics).
Psychology as a science: despite skepticism about psychology’s status as a science, modern psychology uses improved measures, study designs, and statistics to study human nature; many phenomena are studied using behavioral measures and inferences about mental processes.
Early pioneers in psychology:
Francis Galton (late 1800s): patches of color to test perceptual abilities; invented self-report questionnaires; studied twins to explore nature vs nurture; coined the phrase “Nature versus Nurture.”
Galton pioneered using self-reports and twin studies to estimate genetic vs environmental contributions to personality, a precursor to current nature–nurture questions.
Modern measurement of happiness and other states uses multiple methods to overcome biases:
Self-report scales (with caveats: honesty, scale interpretation, etc.).
Peer reports (ratings by friends/family) to corroborate self-reports.
Behavioral tasks and memory measures to examine tendencies (e.g., dispositionally positive people recalling pleasant events).
Biological measures: saliva cortisol (stress hormone) and fMRI (brain activation), e.g., left prefrontal cortex involvement in mood.
Psychology is a relatively young science: physics and chemistry are hundreds of years old; psychology is roughly 150 years old, with most major findings emerging in the last 60 years. There are legitimate limits, but it is a science.
Psychological science is useful for developing interventions that help people live better lives.
Applications and Practical Implications of Psychological Science
Cognitive Behavioral Therapy (CBT) has demonstrated effectiveness for depression and anxiety disorders (e.g., Butler, Chapman, Forman, & Beck, 2006; Hoffman & Smits, 2008).
Some therapies can be harmful on average (Lilienfeld, 2007).
Organizational psychology: interventions can increase productivity and job satisfaction (Guzzo, Jette, & Katzell, 1985).
Human factors engineering: redesigns to improve safety and usability (e.g., Alphonse Chapanis redesigned cockpit controls to reduce pilot errors and crashes).
Forensic science: DNA evidence has exonerated prisoners and improved courtroom decision-making; eyewitness memory is fallible (Loftus’ research on memory limits and unreliability).
Overall: psychological findings have practical importance beyond laboratory settings; psychology aims to improve real-world outcomes.
Psychology as a science continues to learn and grow; there is still much to discover in understanding behavior.
Ethics of Scientific Psychology
Psychology differs from some natural sciences in that human participants are involved; thus ethical guardrails are essential to protect participants from harm.
Key ethical guidelines (Diener & Crandall, 1978; Sales & Folkman, 2000):
Informed consent: participants should know when they are involved and understand what will happen; participation should be voluntary.
Confidentiality: personal information should not be disclosed without consent.
Privacy: private places should not be observed without knowledge and consent; confidential information should not be sought without consent.
Benefits and risks: potential benefits must be weighed against risks; participants should be exposed to acceptable risk only with informed understanding of risks and potential benefits.
Deception and debriefing: deception may be necessary in some studies to prevent behavior modification; participants should be debriefed after participation to reveal the true nature of the study.
An example: Milgram-type studies raise ethical questions about obedience to authority; would such a design be approved by modern review boards? (illustrative depiction in the transcript).
Why Learn About Scientific Psychology?
A professor’s question about why study psychology yields a spectrum of reasons:
1) To understand ourselves.
2) To understand other people and groups.
3) To be better able to influence others (e.g., in child socialization or motivating employees).
4) To learn how to help others and improve the world (effective psychotherapy).
5) To acquire a profession (e.g., social worker, professor).
6) To learn how to evaluate research claims encountered in media and literature.
7) Because it is interesting, challenging, and fun.
The final point emphasizes intrinsic motivation: psychology can be rewarding and engaging beyond practical outcomes.
Conclusions
Psychology as a science is an exciting and ongoing adventure.
Whether you become a scientific psychologist, an applied psychologist, or a well-informed person who understands research, psychology can influence your life, provide rewards, and deepen understanding.
The material encourages ongoing curiosity and enjoyment of psychology and neuroscience.
Outside Resources and Discussion
External resources mentioned: Science Heroes (a celebration of people who made lifesaving discoveries) at http://www.scienceheroes.com/index.php?option=com_content&view=article&id=258&Itemid=27
Discussion questions (to reflect on the material):
Do you think science has done more harm than good? Why or why not?
Which challenges faced by humanity are due to human behavior vs. external factors?
If you were a research psychologist, which phenomena would interest you most?
Can psychological science help with global challenges (global warming, war, inequality, mental illness)?
What can science study, and what is outside its scope? Are some questions impossible to study scientifically?
Does science threaten to replace religion? Should science replace religion?
Are there human behaviors that should not be studied, or are some topics too sacred or dangerous to investigate?
Vocabulary
Empirical methods: Approaches to inquiry tied to actual measurement and observation.
Ethics: Professional guidelines that guide decisions to protect research participants and maintain integrity (avoid conflicts of interest, etc.).
Hypotheses: A logical idea that can be tested.
Systematic observation: Careful observation of the natural world to better understand it; observations provide data for tracking, tallying, and organizing information.
Theories: Groups of closely related phenomena or observations.
Notes on Key Concepts and References
The scientific method in psychology combines systematic observation, testable hypotheses, peer review, and cumulative knowledge to explain behavior.
Ethics are central to research with human participants; informed consent, confidentiality, privacy, risk-benefit analysis, and appropriate use of deception with debriefing are core elements.
The historical development of psychology includes early methods (e.g., Galton’s self-reports and twin studies) and modern multimodal approaches (self-report, peer report, behavioral tasks, memory measures, and biological measures).
Practical implications of psychology span clinical, organizational, legal (forensic), and safety domains (human factors).
The relationship between science and society is symbiotic: science drives progress and policy, while ethical considerations guide responsible science.
of households had televisions in the modern context; have electricity; of the world population have mobile phones; Life expectancy rose from years to years; Learning gains in IQ are linked to nutrition and schooling; significant scientific milestones include vaccination and the Green Revolution.