Experimental research is a method that involves a tremendous amount of control over variables of interest. It utilizes randomized assignment of participants to conditions and systematic manipulation of an independent variable to observe its effects on a measured dependent variable, with the objective of drawing causal inferences.

Experimental Research

Longitudinal research is a non-experimental design in which a single group of people is followed and repeatedly assessed over an extended period as they age. While this method provides a superior means of directly studying developmental changes by avoiding cohort effects, it is heavily time-consuming and demands a substantial long-term investment from both researchers and participants.

Longitudinal Research

Cross-sectional research is a non-experimental design used to investigate changes over time by simultaneously comparing two or more pre-existing groups of people, such as individuals in different age brackets. It is classified as non-experimental because it relies on naturally occurring group differences rather than the manipulation of an independent variable or random assignment.

Cross-Sectional Research

Correlational research is a widespread type of non-experimental research in which an investigator measures two variables—either continuous or categorical—and evaluates the statistical relationship (correlation) between them. Crucially, the researcher does this with little to no effort to control extraneous variables or manipulate an independent variable. It is often chosen when a relationship is not believed to be causal, or when exploring causal relationships where manipulating the independent variable is impossible, impractical, or unethical. By utilizing this strategy, researchers can achieve two fundamental scientific goals: describing the strength and direction of the relationship between the variables, and predicting scores on one variable based on the other using a statistical technique called regression.

Correlational Research

A survey is a versatile data collection tool used to gather meaningful answers about topics such as voting intentions, consumer preferences, social attitudes, or health. These self-report measures can vary in length and can be administered through multiple formats, including in-person interviews, telephone calls, mail questionnaires, or online over the Internet.

Survey

Relying on individuals to explain their own behavior has significant limitations. A person may be unwilling or uncomfortable to answer honestly, or they may be incapable of answering, such as in the case of an infant. This makes direct questioning an unreliable method in many research situations.

Limitations of Self-Report in Psychological Inquiry

Reliability is a critical quality of data collection tools in research, referring to their ability to produce consistent and replicable results over time and across different applications.

Reliability of Research Tools

Validity is a crucial characteristic of research instruments, indicating the degree to which a tool accurately measures the concept it is intended to measure.

Validity of Research Tools

Ruth W. Howard was a pioneering researcher who, in 1934, became the first African-American woman to earn a PhD in psychology.

Ruth W. Howard

A researcher wants to determine if a new mindfulness meditation program *causes* a reduction in symptoms of anxiety. Which of the following research designs would provide the strongest evidence to support this causal claim?

A team of researchers wants to determine if a new type of cognitive training program *directly causes* an improvement in problem-solving skills in adults. To definitively establish this cause-and-effect link, which of the following research methods is most appropriate?

A case study is an observational research method involving an in-depth, and often longitudinal, examination of an individual, social unit, or event. In psychology, case studies typically provide a detailed qualitative description and analysis of a single individual, frequently one who has a rare condition, unusual disorder, or specific brain damage. While they primarily rely on qualitative tools like interviews and naturalistic observation, case studies can also incorporate quantitative data such as psychological testing or physiological measurements.

Case Study

Archival research is an observational approach that involves analyzing pre-existing archival data that were originally collected for some other purpose, rather than actively collecting new data.

Archival Research

Observational research encompasses a variety of non-experimental studies in which behavior is systematically observed and recorded. This approach involves examining subjects without any manipulation or control of variables.

Observational Research

To understand, describe, and explain behavior and its underlying cognitive and biological processes, psychologists utilize a diverse range of research methods. These approaches span a spectrum from passive observational techniques to interactive methods involving direct engagement with study participants. The interactive methods themselves vary in complexity, from straightforward questioning in surveys and in-depth interviews to rigorously controlled experiments.

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Research methods are the techniques and strategies used while collecting or analyzing data.

Research Methods

Psychological research focuses on understanding behavior, as well as the cognitive (mind) and physiological (body) processes that underlie behavior. Psychologists use scientific methods to acquire knowledge.

Psychological Research

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

UX research methods can be used to generate insights about users’ behaviors, motivations, attitudes, and needs. You can use different UX research methods to assess pain points and highlight opportunities to improve the user experience of a product.

UX Research Methods

The process of collecting information related to the research questions.

Data Collection Methods

The process of determining significance within collected information.

Data Analysis and Interpretation Methods

- Usually drawn from qualitative methods
  - Often adapted to utilize the strengths and perspectives of group members
- Indivdual roles may become group roles
  - Data Collection
- It is a dialogue 

Research Methods in Collaborative Groups

Research Methods in Psychology

A field study is a type of research conducted in a real-world, natural environment rather than an artificial laboratory. Because they take place in natural settings, field studies often exhibit higher external validity, allowing researchers to more effectively generalize their findings to the real world.

Field Study

Quantitative research is an empirical methodology wherein researchers start with a specific research question, collect numerical data from a sizable sample of participants, and analyze it using statistical techniques. As the most widely used approach in psychology, its primary objective is to deduce generalizable conclusions about a larger population.

Quantitative Research

Qualitative research is a methodological approach that originated in anthropology and sociology but is now widely applied in psychology. Rather than using numerical statistics to draw general population conclusions, qualitative researchers begin with a less focused research question to deeply understand the detailed experiences of their participants. They collect large amounts of unfiltered, nonnumerical data from a relatively small number of individuals and analyze it using techniques such as grounded theory, thematic analysis, critical discourse analysis, or interpretative phenomenological analysis.

Qualitative Research

To navigate the vast amount of available information, it is essential to adopt a stance of healthy skepticism and think critically. When encountering a claim, one should evaluate it from multiple perspectives by asking key questions: What is the expertise of the person making the claim? What might they gain if the claim is valid? Is the claim justified by the available evidence? And what do other researchers think of the claim?

Evaluating Research Critically

Notable researchers in psychology include:

- Margaret Floy Washburn
- Mary Whiton Calkins 
- Francis Sumner
- Inez Beverly Prosser
- Horatio Pinero
- Gunamudian David Boaz and Narendra Nath Sen Gupta

Notable Researchers in Psychology

Ethical standards in research are dynamic and evolve over time, meaning practices once considered acceptable may now be viewed as unethical. Contemporary researchers are required to follow established ethical guidelines, particularly when studies involve human participants, to ensure their work respects human dignity and safety. This involves integrating ethical considerations into the core design and implementation of their research.

Ethics in Psychological Research

Several areas of psychology incorporate interdisciplinary, multi-disciplinary, or cross-disciplinary approaches. For example:
- Consciousness
- Motivation
- Emotion

Cross-Disciplinary Research Topics in Psychology

Upon completing a research project, psychologists disseminate their findings to the broader scientific community by publishing articles in journals or presenting them at research conferences. Sharing this data is a critical step, as it enables other researchers to replicate the experiments or build upon the original results, thereby advancing the collective understanding of the field.

Research Dissemination in Psychology

Scientific research provides objective, evidence-based findings that are crucial for informing effective public policies. By relying on systematic inquiry rather than anecdote or opinion, policymakers can make more informed decisions that address societal issues. This evidence-based approach is essential for responsibly managing public resources, such as taxpayer funds, by ensuring that funded programs and initiatives are genuinely effective.

Role of Scientific Research in Guiding Public Policy

Beyond its role in shaping public policy, scientific research is a valuable tool for individuals making significant decisions in their personal lives. When faced with important choices, such as those concerning family health and well-being, consulting research allows people to move beyond anecdotal evidence and personal biases to make more informed judgments.

Importance of Scientific Research in Personal Decision-Making

Scientific research offers a systematic way to understand the world, serving as a crucial alternative to relying on intuition, authority, or luck. It enables us to challenge our assumptions and superstitions with objective evidence. History provides numerous examples of widely held beliefs that were proven false through scientific inquiry, such as the geocentric model of the solar system, the immobility of continents, and the idea that demonic possession caused mental illness, a misconception sometimes historically treated by boring a large hole through the skull.

Scientific Research as a Tool to Overcome Misconceptions

A researcher wants to investigate the common belief that 'venting' anger by yelling or hitting a pillow is an effective way to reduce aggressive feelings. The researcher designs a study where one group of participants is provoked and then hits a punching bag, while a second provoked group sits quietly for the same amount of time. Afterward, the researcher measures the aggressive feelings of participants in both groups. Which of the following statements best analyzes why this approach is a form of psychological research?

The scientific study of the mind is fundamentally limited because thoughts and subjective experiences, unlike matter or energy, are not directly measurable. This core constraint means our scientific understanding of the mind is necessarily incomplete. This challenge is further illustrated by the fact that observable behaviors can arise from multiple unobservable mental states, forcing psychologists to infer internal processes rather than observing them directly.

Scientific Limitations in Studying the Mind

Psychological research provides a systematic method for addressing complex and often contentious questions, such as the societal impact of technology. By seeking answers based on verifiable evidence rather than personal opinions, this scientific approach helps in navigating issues where public views are frequently strong and contradictory.

Role of Psychological Research in Navigating Contentious Issues

Experimental psychologists are researchers who investigate human behavior and mental processes to advance scientific knowledge. They typically hold doctoral or master's degrees and work primarily as college and university faculty, where they balance research with teaching. While some are licensed clinicians, the majority specialize in non-clinical subfields like cognitive, developmental, or social psychology. They are driven by the intellectual challenges of research and the satisfaction of contributing to our understanding of human behavior.

Experimental Psychologist

While the majority of contemporary psychological research relies on human participants, a significant minority involves nonhuman animal subjects. This practice is especially prevalent in fields such as the study of learning and conditioning, behavioral neuroscience, and the development of surgical or drug therapies for psychological disorders.

Nonhuman Animal Subjects in Research

Scientific psychology blogs provide an accessible and engaging platform for summarizing and commenting on current research findings. Prominent examples include Research Digest, Talk Psych, Brain Blogger, Mind Hacks, and PsyBlog. These blogs offer students and the general public a fun way to follow new developments in psychological science and understand how research is applied to everyday life.

Scientific Psychology Blogs

The clinical practice of psychology involves the diagnosis and treatment of psychological disorders and related behavioral problems. This broad applied discipline encompasses professionals like clinical and counseling psychologists who help individuals and communities function better. A rigorous scientific approach is essential in clinical practice, as clinicians must rely on empirical research to accurately understand psychological problems and make evidence-based treatment decisions.

Clinical Practice of Psychology

Basic research in psychology is scientific inquiry conducted primarily for the sake of achieving a more detailed and accurate understanding of human behavior and natural phenomena. It focuses on expanding foundational knowledge and answering theoretical questions without necessarily attempting to address or solve any particular practical problem.

Basic Research

Applied research is scientific inquiry conducted primarily to address and resolve specific, practical problems. Unlike basic research, which focuses on general understanding, applied research applies scientific methods directly toward real-world issues, such as public safety concerns, to develop actionable solutions and interventions.

Applied Research

In psychological research, a participant is an individual being studied. As the term suggests, participants are not passive subjects but are actively involved in the research process.

Psychological Research Participant

The scientific process in psychology operates as a continuous, cyclical model. It begins when a researcher formulates a question based on existing research literature. This question then guides an empirical study, the findings of which are subsequently published. Once published, these results are incorporated back into the research literature, serving as the foundation for new research questions and continuing the cycle.

Cyclical Model of Psychological Research

In psychological research, a variable is any characteristic or factor that can differ or change across different individuals, situations, or over time. Variables can be broadly classified into two main types: quantitative variables, which involve numerical measurements (such as age or height), and categorical variables, which represent distinct groupings or categories (such as academic major or geographic location).

Variables in Psychological Research

A research sample is a relatively small subset of individuals selected from a larger population to participate in a psychological study. Researchers use various techniques to recruit this subset, ranging from convenience sampling, which relies on readily available participants, to simple random sampling, which ensures every member of the population has an equal chance of being selected.

Research Sample

Non-experimental research is a broad category of research methodologies defined by the lack of manipulation of an independent variable. Instead of controlling factors, researchers simply measure variables as they naturally occur in real-world or laboratory settings. Although experimental research can provide strong evidence that changes in an independent variable cause differences in a dependent variable, non-experimental research generally cannot. Despite this inability to draw causal conclusions, non-experimental research is still considered extremely important and is utilized in cases where experimental research cannot be carried out.

Non-Experimental Research

The research literature in any given scientific field consists of all the published research in that area. It primarily includes articles in professional journals and scholarly books, while excluding sources intended for the general public, such as self-help books, dictionary entries, and websites, which lack rigorous peer review.

Research Literature

Descriptive statistics are a set of quantitative techniques used to summarize, organize, and visually display the data collected from a research sample. Important examples include measures of central tendency (such as the mean, median, and mode), which describe average scores, and measures of dispersion (such as the range, standard deviation, and variance), which indicate how spread apart the scores are.

Descriptive Statistics

Inferential statistics are a set of mathematical techniques used by researchers to determine whether a statistical result or relationship observed in a study's sample reflects something that is genuinely true of the broader population.

Inferential Statistics

The hypothetico-deductive method is a fundamental framework used by psychologists and other scientists to structure their research. In this cyclical process, researchers construct or utilize existing theories to interpret phenomena, derive specific hypotheses from those theories, conduct empirical tests, and ultimately reevaluate the original theories based on the new results.

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