The John Henry effect is an experimental bias introduced into social experiments by reactive behavior by the control group.
In a controlled social experiment if a control is aware of their status as members of the control group and is able to compare their performance with that of the treatment group, members of the control group may actively work harder to overcome the "disadvantage" of being in the control group. [1]
For example, if in an educational trial where the school classes who are in the treatment receive an extra support teacher, students who are in the control group may be induced to work harder to overcome that disadvantage.
The term was first used by Gary Saretsky (1972) to describe the behavior of John Henry, a legendary American steel driver in the 1870s who, when he heard his output was being compared with that of a steam drill, worked so hard to outperform the machine that he died in the process. [2]
Psychology is the scientific study of mind and behavior. Its subject matter includes the behavior of humans and nonhumans, both conscious and unconscious phenomena, and mental processes such as thoughts, feelings, and motives. Psychology is an academic discipline of immense scope, crossing the boundaries between the natural and social sciences. Biological psychologists seek an understanding of the emergent properties of brains, linking the discipline to neuroscience. As social scientists, psychologists aim to understand the behavior of individuals and groups.
The bystander effect, or bystander apathy, is a social psychological theory that states that individuals are less likely to offer help to a victim in the presence of other people. First proposed in 1964 after the murder of Kitty Genovese, much research, mostly in psychology research laboratories, has focused on increasingly varied factors, such as the number of bystanders, ambiguity, group cohesiveness, and diffusion of responsibility that reinforces mutual denial. If a single individual is asked to complete the task alone, the sense of responsibility will be strong, and there will be a positive response; however, if a group is required to complete the task together, each individual in the group will have a weak sense of responsibility, and will often shrink back in the face of difficulties or responsibilities. The theory was prompted by the murder of Kitty Genovese about which it was wrongly reported that 38 bystanders watched passively.
Experimental psychology refers to work done by those who apply experimental methods to psychological study and the underlying processes. Experimental psychologists employ human participants and animal subjects to study a great many topics, including sensation, perception, memory, cognition, learning, motivation, emotion; developmental processes, social psychology, and the neural substrates of all of these.
Learned helplessness is the behavior exhibited by a subject after enduring repeated aversive stimuli beyond their control. It was initially thought to be caused by the subject's acceptance of their powerlessness, by way of their discontinuing attempts to escape or avoid the aversive stimulus, even when such alternatives are unambiguously presented. Upon exhibiting such behavior, the subject was said to have acquired learned helplessness. Over the past few decades, neuroscience has provided insight into learned helplessness and shown that the original theory had it backward: the brain's default state is to assume that control is not present, and the presence of "helplessness" is what is learned first. However, it is unlearned when a subject is faced with prolonged aversive stimulation.
The Hawthorne effect is a type of human behavior reactivity in which individuals modify an aspect of their behavior in response to their awareness of being observed. The effect was discovered in the context of research conducted at the Hawthorne Western Electric plant; however, some scholars think the descriptions are fictitious.
Social influence comprises the ways in which individuals adjust their behavior to meet the demands of a social environment. It takes many forms and can be seen in conformity, socialization, peer pressure, obedience, leadership, persuasion, sales, and marketing. Typically social influence results from a specific action, command, or request, but people also alter their attitudes and behaviors in response to what they perceive others might do or think. In 1958, Harvard psychologist Herbert Kelman identified three broad varieties of social influence.
Harry Frederick Harlow was an American psychologist best known for his maternal-separation, dependency needs, and social isolation experiments on rhesus monkeys, which manifested the importance of caregiving and companionship to social and cognitive development. He conducted most of his research at the University of Wisconsin–Madison, where humanistic psychologist Abraham Maslow worked with him for a short period of time.
The observer-expectancy effect is a form of reactivity in which a researcher's cognitive bias causes them to subconsciously influence the participants of an experiment. Confirmation bias can lead to the experimenter interpreting results incorrectly because of the tendency to look for information that conforms to their hypothesis, and overlook information that argues against it. It is a significant threat to a study's internal validity, and is therefore typically controlled using a double-blind experimental design.
The transtheoretical model of behavior change is an integrative theory of therapy that assesses an individual's readiness to act on a new healthier behavior, and provides strategies, or processes of change to guide the individual. The model is composed of constructs such as: stages of change, processes of change, levels of change, self-efficacy, and decisional balance.
Self-determination theory (SDT) is a macro theory of human motivation and personality that concerns people's innate growth tendencies and innate psychological needs. It pertains to the motivation behind people's choices in the absence of external influences and distractions. SDT focuses on the degree to which human behavior is self-motivated and self-determined.
Social rejection occurs when an individual is deliberately excluded from a social relationship or social interaction. The topic includes interpersonal rejection, romantic rejection, and familial estrangement. A person can be rejected or shunned by individuals or an entire group of people. Furthermore, rejection can be either active by bullying, teasing, or ridiculing, or passive by ignoring a person, or giving the "silent treatment". The experience of being rejected is subjective for the recipient, and it can be perceived when it is not actually present. The word "ostracism" is also commonly used to denote a process of social exclusion.
System justification theory is a theory within social psychology that system-justifying beliefs serve a psychologically palliative function. It proposes that people have several underlying needs, which vary from individual to individual, that can be satisfied by the defense and justification of the status quo, even when the system may be disadvantageous to certain people. People have epistemic, existential, and relational needs that are met by and manifest as ideological support for the prevailing structure of social, economic, and political norms. Need for order and stability, and thus resistance to change or alternatives, for example, can be a motivator for individuals to see the status quo as good, legitimate, and even desirable.
In fields such as epidemiology, social sciences, psychology and statistics, an observational study draws inferences from a sample to a population where the independent variable is not under the control of the researcher because of ethical concerns or logistical constraints. One common observational study is about the possible effect of a treatment on subjects, where the assignment of subjects into a treated group versus a control group is outside the control of the investigator. This is in contrast with experiments, such as randomized controlled trials, where each subject is randomly assigned to a treated group or a control group. Observational studies, for lacking an assignment mechanism, naturally present difficulties for inferential analysis.
John A. Bargh is a social psychologist currently working at Yale University, where he has formed the Automaticity in Cognition, Motivation, and Evaluation (ACME) Laboratory. Bargh's work focuses on automaticity and unconscious processing as a method to better understand social behavior, as well as philosophical topics such as free will. Much of Bargh's work investigates whether behaviors thought to be under volitional control may result from automatic interpretations of and reactions to external stimuli, such as words.
A quasi-experiment is an empirical interventional study used to estimate the causal impact of an intervention on target population without random assignment. Quasi-experimental research shares similarities with the traditional experimental design or randomized controlled trial, but it specifically lacks the element of random assignment to treatment or control. Instead, quasi-experimental designs typically allow the researcher to control the assignment to the treatment condition, but using some criterion other than random assignment.
Behavioral activation (BA) is a third-generation behavior therapy for treating mood disorders. Behavioral activation primarily emphasizes engaging in positive and enjoyable activities to enhance one's mood.
Aversive racism is a social scientific theory proposed by Samuel L. Gaertner & John F. Dovidio (1986), according to which negative evaluations of racial/ethnic minorities are realized by a persistent avoidance of interaction with other racial and ethnic groups. As opposed to traditional, overt racism, which is characterized by overt hatred for and discrimination against racial/ethnic minorities, aversive racism is characterized by more complex, ambivalent expressions and attitudes nonetheless with prejudicial views towards other races. Aversive racism arises from unconscious personal beliefs taught during childhood. Subtle racist behaviors are usually targeted towards African Americans. Workplace discrimination is one of the best examples of aversive racism. Biased beliefs on how minorities act and think affect how individuals interact with minority members.
Reactivity is a phenomenon that occurs when individuals alter their performance or behavior due to the awareness that they are being observed. The change may be positive or negative, and depends on the situation. It is a significant threat to a research study's external validity and is typically controlled for using blind experiment designs.
In social psychology, a stereotype is a generalized belief about a particular category of people. It is an expectation that people might have about every person of a particular group. The type of expectation can vary; it can be, for example, an expectation about the group's personality, preferences, appearance or ability. Stereotypes are often overgeneralized, inaccurate, and resistant to new information. A stereotype does not necessarily need to be a negative assumption. They may be positive, neutral, or negative.
In social psychology, naïve realism is the human tendency to believe that we see the world around us objectively, and that people who disagree with us must be uninformed, irrational, or biased.