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grouped frequency distribution

a description of how often a set of specific responses, organized into equal-sized subsets of possible responses, occur in a sample. It is a type of frequency distribution that is particularly useful when there are a large number of response choices (e.g., 10–20 or more) and researchers wish to present the information more concisely. For example, suppose that a researcher wants to summarize the individuals in a sample in which age ranges from 16 to 85 years. Instead of listing all 69 different ages, the researcher could combine the data into 5-year intervals, which would produce 14 subsets of ages (e.g., 16–20, 21–25, 26–30, … 81–85), thus reducing a large number of scores into smaller, more manageable groups.

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Psychology term of the day

May 26th 2024

GABAA receptor

GABAA receptor

one of the two main types of receptor protein that bind the neurotransmitter gamma-aminobutyric acid (GABA), the other being the GABAB receptorgabab-receptor. It is located at most synapses of most neurons that use GABA as a neurotransmitter. The predominant inhibitory receptor in the central nervous system, it functions as a chloride channel (see ion channel). GABA agonists, such as the barbiturates and benzodiazepines, enhance the binding of GABA to GABAA receptors, allowing for increased conductance of chloride through the ion channel and thereby hyperpolarizing the neuron and inhibiting its activity. GABA antagonists, such as bicuculline and picrotoxin, block the inhibitory effects of GABA at this receptor. Many other substances, including alcohol (ethanol), are thought to exert at least part of their effect via interaction at the GABAA receptor.