A five-step process for empirical investigation of a hypothesis under conditions designed to control biases and subjective judgments.
An approach to research that relies on sensory experience and observation as research data.
A statement predicting the outcome of a scientific study; a statement describing the relationship among variables in a study.
Specific descriptions of concepts involving the conditions of a scientific study.
A stimulus condition so named because the experimenter changes it independently of all the other carefully controlled experimental conditions.
A process by which chance alone determines the order in which the stimulus is presented.
Pieces of information, especially information gathered by a researcher to be used in testing a hypothesis.
In research this refers to doing a study over to see whether the same results are obtained. As a control for bias, replication is often done by someone other than the researcher who performed the original study.
A kind of research in which the researcher controls all the conditions and directly manipulates the conditions, including the independent variable.
Variables that have an unwanted influence on the outcome of an experiment.
Constraints that the experimenter places on the experiment to ensure that each subject has the exact same conditions.
Each subject of the sample has an equal likelihood of being chosen for the experimental group of an experiment.
A research method in which subjects are observed in their natural environment.
A study in which a representative cross section of the population is tested or surveyed at one specific time.
A research method in which a cross section of the population is chosen and then each cohort is followed for a short period of time.
An experimental procedure in which both researchers and participants are uninformed about the nature of the independent variable being administered.
Institutional Review Board
A committee at each institution where research is conducted to review every experiment for ethics and methodology.
Institutional Animal Care and Use Committee
A committee at each institution where research is conducted to review every experiment involving animals for ethics and methodology.
ABCs of Laboratory Animal Research
Guiding principles in which research on animals is conducted. Governs the morality and ethical aspect of research on animals.
A summary chart, showing how frequently each of the scores in a set of data occurs.
A bar graph depicting a frequency distribution. The height of the bars indicates the frequency of a group of scores.
Statistical procedures used to describe characteristics and responses of groups of subjects.
The measure of central tendency most often used to describe a set of data--calculated by adding all the scores and diving by the number of scores. (mathematical average)
The measure of central tendency for a distribution, represented by the score the separates the upper half of the scores in a distribution from the lower half.
A measure of central tendency for a distribution, represented by the score that separates the upper half scores in a distribution from the lower half.
The simplest measure of variability, represented by the difference between the highest and the lowest values in a frequency distribution.
A measure of variability that indicates the average difference between the scores and their mean.
A relationship between variables, in which changes in one variable are reflected in changes in the other variable.
A bell-shaped curve, describing the spread of a characteristic throughout a population.
A number between -1 and +1 expressing the degree of relationship between two variables.
Statistical techniques used to assess whether the results of a study are reliable or whether they might be simply the result of a chance.
A sample obtained in such a way that it reflects the distribution of important variables in the larger population in which the researchers are interested.
Psychologists accept a difference between the groups as "real", or significant, when the probability that it might be due to an atypical sample drawn by chance is less than 5 in 100.
The tendency to attend to evidence that complements and confirms our beliefs or expectations, while ignoring evidence that does not.
Psychologists who use the knowledge developed by experimental psychologists to solve human problems.
A historical school of psychology devoted to uncovering the basic structures that make up mind and thought.
A historical school of psychology that believed mental process could best be understood in terms of their adaptive purpose and function.
A historical school of psychology that sought to understand how the brain works by studying perception and perceptual learning.
A historical school that has sought to make psychology an objective science that focused only on behavior.
An approach to psychology based on Sigmund Freud's assertions, which emphasize unconscious processes.
The psychological perspective that searches for the causes of behavior in the functioning of genes, the brain, and nervous system, and the endocrine system.
A relatively new interdisciplinary field devoted to understanding how the brain creates thoughts, feelings, motive, consciousness
A relatively new specialty in psychology that sees behavior and mental processes in terms of their genetic adaptations for survival and reproduction.
The psychological perspective emphasizing changes that occur across the lifespan.
The psychological perspective emphasizing mental processes, such as learning, memory, perception, and thinking, as forms of information processing.
An interdisciplinary field emphasizing brain activity as information processing.
A clinical viewpoint emphasizing the understanding of mental disorders in terms of unconscious needs, desires, memories, and conflicts.
A clinical viewpoint emphasizing human ability, growth, potential, and free will.
A psychological perspective that finds the source of our actions in environmental stimuli, rather than in inner mental processes.
A psychological perspective emphasizing the importance of social interaction, social learning, and a cultural perspective.
A psychological perspective that examines individual behavior through the lens of natural selection.