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Psych 130 Chapter 04
midterm 1
39
Psychology
Not Applicable
09/13/2007

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Term
adoptees method
Definition
research method that studies children who were adopted and reared completely apart from their abnormal parents, thereby eliminating the influence of being raised by disordered parents.
Term
analogue experiment
Definition
an experimental study of a phenomenon different from but related to the actual interests of the investigator; for example, animal research used to study human disorders, or research on mild symptoms used as a bridge to clinical disorders
Term
case study
Definition
the collection of historical or biographical information on a single individual, often including experiences in therapy
Term
clincial significance
Definition
the degree to which effect size is large enough to be meaningful in predicting or treating a clinical disorder
Term
concordance
Definition
as applied in behavior genetics, the similarity in psychiatric diagnosis or in other traits within a pair of twins
Term
control group
Definition
those for whom the active condition of the independent variable is not administered, thus forming a baseline against which the effects of the active condition of the independent variable can be evaluated
Term
correlation
Definition
the tendency for two variables, such as height and weight, to covary
Term
correlation coefficient
Definition
a statistic ranging in value from -1.00 to +1.00 that measures the degree to which two variables are related. The sign indicates whether the relationship is positive or negative, and the magnitude indicates the strength of the relationship
Term
correlational method
Definition
the research strategy used to establish whether two or more variables are related without manipulating the independent variable. Relationships may be positive--as values for one variable increase, those for the other do also--or negative--as values for one variable increase, those for the other decrease
Term
cross-fostering
Definition
research method that studies offspring who were adopted and reared completly apart from their biological parents, where the adoptive parent has a particular disorder but the biological parent does not, thereby introducing the influence of being raised by disordered parents
Term
cross-sectional design
Definition
studies in which different age groups are compared at the same time
Term
dependent variable
Definition
in a psychological experiment, the behavior that is measured and is expected to change with manipulation of the independent variable
Term
directionality problem
Definition
a difficulty that arises in the correlational method of research when it is known that two variables are related but it is unclear which is causing the other
Term
dizygotic (DZ) twins
Definition
both partners who developed from separate fertilized eggs and who are only 50% alike genetically, just as siblings born from different pregnancies involving the same father; also called fraternal twins
Term
double-blind procedure
Definition
a method for reducing the biasing effects of the expectations of research participant and experimenter; neither is allowed to know whether the independent variable of the experiment is being applied to the participant
Term
epidemiology
Definition
the study of the frequency and distribution of illness in a population
Term
experiment
Definition
the most powerful research technique for determining causal relationships; involves the manipulation of an independent variable, the measurement of a dependent variable, and the random assignment of participants to the several different conditions being investigated
Term
experimental effect
Definition
a statistically significant difference between two groups experiencing different manipulations of the independent variable
Term
external validity
Definition
the extent to which the results of a study can be considered generalizable
Term
family method
Definition
a research strategy in behavior genetics in which the frequency of a trait or of abnormal behavior is determined in relatives who have varying percentages of shared genetic background
Term
high-risk method
Definition
a research technique involving the intensive examination of people, such as the offspring of people with schizophrenia, who have a high probability of later becoming abnormal
Term
hypotheses
Definition
specific expectations or predictions about what should occur or be found if a theory is true or valid
Term
incidence
Definition
in epidemiological studies of a particular disorder, the rate at which new cases occur in a given place at a given time
Term
independent variable
Definition
in a psychological experiment, the factor, experience, or treatment that is under the control of the experimenter and that is expected to have an effect on participants as assessed by changes in the dependent variable
Term
index cases (proband)
Definition
the person who in a genetic investigation bears the diagnosis or trait in which the investigator is interested
Term
longitudinal design
Definition
investigation that collects information on the same individuals repeatedly over time, perhaps over many years, in an effort to determine how phenomena change
Term
meta-analysis
Definition
a quantitative method of analyzing the results of a set of studies on a topic, by standardizing the results
Term
monozygotic (MZ) twins
Definition
genetically identical twins who have developed from a single fertilized egg
Term
placebo
Definition
any inactive therapy or chemical agent, or any attribute or component of such a therapy or chemical, that affects a person's behavior for reasons related to his or her expectation of change
Term
placebo effect
Definition
the action of a drug or psychological treatment that is not attributable to any specific operations of the agent. For example, a tranquilizer can reduce anxiety both because of its special biochemical action and because the recipient expects relief
Term
prevalence
Definition
in epidemiological studies of a disorder, the percentage of a population that has the disorder at a given time
Term
random assignment
Definition
a method of assigning people to groups by chance (e.g., using the flip of a coin). the procedure helps to ensure that groups are comparable before the experimental manipulation begins
Term
reversal (ABAB) design
Definition
an experimental design in which behavior is measured during a baseline period (A), during a period when a treatment is introduced (B), during the reinstatement of the conditions that prevailed in the baseline period (A), and finally during a reintroduction of the treatment (B); commonly used in operant research to isolate cause-effect relationships
Term
risk factor
Definition
a condition or variable that increases the likelihood of developing a disorder
Term
single-subject experimental design
Definition
a design for an experiment conducted with a single subject. typically, behavior is measured within a baseline condition, then during an experimental or treatment condition, and finally within the baseline condition again
Term
statistical significance
Definition
a result that has a low probability of having occurred by chance alone and is by convention regarded as important
Term
theory
Definition
a formally stated and coherent set of propositions that explain and logically order a range of phenomena, generating testable predictions or hypotheses
Term
third-variable problem
Definition
the difficulty in the correlational method of research whereby the relationship between two variables may be attributable to a third factor.
Term
twin method
Definition
research strategy in behavior genetics in which concordance rates of monozygotic and dizygotic twins are compared
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