A statement outlining the purpose of an investigation
Independent Variable (IV)
The variable manipulated by the researcher to observe its effect on the dependent variable.
Dependent Variable (DV)
The variable measured in response to changes in the independent variable.
Research Hypothesis
A testable prediction about the income of an investigation
Population
Group of people who are the focus of the investigation
Sample
A subset of the population selected for the study, intended to represent the population.
Random Sampling
A method where every member of the population has an equal chance of being selected, ensuring a representative sample.
Stratified Sampling
Dividing the population into subgroups based on a characteristic, then taking random samples from each stratum.
Convenience Sampling
A non-random technique where participants are selected based on availability and willingness to take part.
Control Group
The group in an experiment that does not receive the treatment and is used as a baseline for comparison.
Experimental Group
The group that receives the treatment being tested in the experiment.
Random Allocation
Assigning participants to different groups using random methods to minimize selection bias.
Extraneous Variables
Variables other than the independent variable that could influence the dependent variable if not controlled.
Controlled Variables
Extraneous variables kept constant to prevent them from affecting the outcome.
Confounding Variables
Variables that vary systematically with the independent variable, making it hard to determine the actual cause of changes in the dependent variable.
Within Subjects Design
Using the same participants in all conditions of the experiment for comparisons within the same group.
Between Subjects Design
Assigning different participants to different conditions for comparisons between different groups.
Mixed Design
Combining within-subjects and between-subjects designs for testing factors within and between subjects.
Ethical Guidelines
Standards guiding research conduct to ensure participant safety, dignity, and rights.
Hereditary (Nature) Factors
Genetic and biological influences on development and behavior inherited from parents.
Environmental (Nurture) Factors
External influences on development and behavior, including upbringing, culture, and experiences.
Biopsychosocial Model
Influences on development including biological, psychological, and social factors.
Emotional Development
Changes in how individuals experience, express, understand, and regulate emotions.
Cognitive Development
Changes in thinking, problem-solving, and decision-making abilities over time.
Social Development
Changes in how individuals interact with others and develop relationships.
Secure Attachment
Confident in relationships, trusts others, and feels comfortable with intimacy.
Insecure Attachment
Includes anxious and avoidant attachment styles.
Ainsworth's Research
Mary Ainsworth's study identifying attachment styles by observing children's reactions to separation and reunion with caregivers.
Piaget's Theory of Cognitive Development (SCPF)
Stages of cognitive development from sensorimotor to formal operational.
Erikson's Theory of Psychosocial Crises
Proposes eight stages of development, each with a specific conflict to resolve.
Cultural Perspective
Behaviors considered normal or abnormal based on cultural context.
Social Norms
Behaviors conforming to expected standards of a society.
Personal Distress
Behaviors causing significant personal suffering or discomfort.
Statistical Rarities
Behaviors that are rare or uncommon within a population.
Adaptive Behaviors
Actions that enable an individual to adjust effectively and healthily to their environment.
Maladaptive Behaviors
Actions that hinder an individual's ability to adjust to and cope with their environment.
Neurodiversity
The concept that neurological differences, such as autism, ADHD, and dyslexia, are natural variations of the human brain and should be respected as such.
Neurotypicality
Refers to individuals whose neurological development and functioning are typical or conform to societal standards of 'normal' cognitive functioning.
Structural Neuroimaging
Techniques that provide images of the brain's anatomy.
Functional Neuroimaging
Techniques that measure brain activity and function.