Types of Experiments in Psychology: Lab, Field, Natural, and Quasi-Experiments

What is a field experiment?

An experiment that takes place in a natural setting where the researcher deliberately changes the independent variable (IV) and records the effect on the dependent variable (DV).

What defines a laboratory (lab) experiment?

An experiment conducted in a controlled environment where the researcher deliberately changes the IV and maintains strict control over extraneous variables.

What is a natural experiment?

An experiment where the change in the IV is not brought about by the researcher but occurs naturally, with the researcher recording the effect on the DV.

What characterizes a quasi-experiment?

A study that resembles an experiment but lacks key elements; the IV is not manipulated by the researcher and simply exists, such as age or gender.

Why are only lab and field experiments considered 'true' experiments?

Because in both types, the independent variable is deliberately manipulated by the researcher.

What is a key strength of lab experiments?

They have high control over extraneous variables, allowing for a clearer demonstration of cause and effect.

What is a limitation of lab experiments?

They may lack generalizability due to the controlled environment not reflecting real-life situations.

What is meant by 'mundane realism' in field experiments?

Field experiments have higher mundane realism because they occur in participants' natural environments, leading to more authentic behavior.

What are some ethical issues associated with field experiments?

Participants may be unaware they are being studied, which raises concerns about consent and invasion of privacy.

What is the main advantage of natural experiments?

They allow researchers to study effects that would be unethical or impractical to manipulate directly.

What is a disadvantage of natural experiments?

The researcher may have less control over extraneous variables, making it harder to establish cause and effect.

What does high internal validity in lab experiments indicate?

It indicates a greater certainty that the changes in the DV are due to the manipulation of the IV.

What does replication mean in the context of experiments?

Replication refers to the ability to repeat an experiment under the same conditions to verify results.

How do lab experiments facilitate replication?

The high level of control in lab experiments ensures that new extraneous variables are not introduced when repeating the experiment.

What is a potential issue with participant awareness in lab experiments?

Participants may exhibit 'unnatural' behavior because they know they are being tested.

How can the tasks in lab experiments affect results?

Tasks may not reflect real-life situations, leading to low mundane realism and potentially skewed results.

What is the significance of the IV in a natural experiment?

The IV changes naturally, allowing the researcher to observe its effect on the DV without direct manipulation.

What is an example of a quasi-experiment?

A study comparing the performance of children with different diagnoses, such as autistic children versus a control group.

What is the relationship between the IV and DV in field experiments?

The researcher observes the effect of the IV on the DV in a natural setting, which may complicate establishing cause and effect.

What is a common method used to assess the effects of television on children's behavior?

Monitoring children's behavior before and after they gain access to television, as seen in studies like Williams (1986).

What is a quasi-experiment?

A study where the independent variable is based on existing differences between groups, such as age or gender, without deliberate manipulation by the researcher.

What distinguishes a natural experiment from a true experiment?

In a natural experiment, the researcher has no control over the independent variable, which occurs naturally, while in a true experiment, the researcher manipulates the independent variable.

What is a limitation of quasi-experiments?

Participants cannot be randomly allocated to conditions, which may introduce extraneous variables.

Why might findings from lab experiments lack external validity?

The controlled environment may not reflect everyday life, leading to 'unnatural' behavior from participants.

What is internal validity in the context of experiments?

It refers to whether the findings of an experiment are valid and controlled within the study itself.

What does external validity refer to?

It refers to the extent to which findings from a study can be generalized to real-world settings.

What is a key characteristic of true experiments?

The independent variable is manipulated by the researcher to observe its effect on the dependent variable.

What is a potential issue with natural experiments?

They may involve rare events, limiting opportunities for research and generalization of findings.

What is the difference between dependent and independent variables?

The independent variable is manipulated to observe its effect, while the dependent variable is measured to assess the outcome.

What is meant by 'mundane realism' in experimental research?

It refers to how closely the experimental setting resembles real-life situations.

What can lead to low internal validity in an experiment?

If extraneous variables are not controlled, it can affect the reliability of the findings.

What is the role of the experimenter in a true experiment?

The experimenter deliberately changes the independent variable and measures the effects on the dependent variable.

How does a field experiment differ from a lab experiment?

Field experiments are conducted in real-world settings, while lab experiments are conducted in controlled environments.

What is a common criticism of lab experiments?

They may lack ecological validity due to their artificial settings.

What is the significance of replication in experiments?

Replication helps verify the reliability and validity of findings across different studies.

What is the impact of participant characteristics on quasi-experiments?

Differences in participant characteristics can confound results, making it hard to determine the effect of the independent variable.