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RACIAL AND ETHNIC DIFFERENCES

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

The supposed differences between one or more ethnic or racial groups. There is no empirical evidence of innate differences between ethnic groups regarding intelligence, character traits of acuity of the senses.

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RACIAL DISCRIMINATION

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

Treating a member of one particular racial or ethnic group differently than one from another racial or ethnic group based solely on the difference. Discrimination in this case is most likely prejudicial based on a personal view of the "character" of the discriminated group.

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RACIAL IDENTITY

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

An individual's sense of having their identity defined by belonging to a particular race or ethnic group. The strength of such identity is dependent on how much he or she has processed and internalized the sociological, political and other contextual factors within that group.

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RACIAL MEMORY

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

Cognitive thought patterns, emotions and experiences believed to be transmitted from generation to generation. These factors are believed by those who advocate a racial memory as having basic influence on individuals psyches and behaviors. Both Freud and Jung embraced at least the concept of a racial memory.

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RACISM

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

A belief that first, individual racial groups have characteristics unique to that group. Secondly, that these characteristic predispose members of the race to act in a certain (and usually unpleasant) way. And thirdly, that the member of the race making these judgments is superior to the other in at least one or more aspects.

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RADEX THEORY OF INTELLIGENCE

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

Louis Guttman, a U.S. psychologist proposed this theory of intelligence. The theory states that the organization of mental ability can be represented by a radial order of complexity. There are two parts to the model: A) a simplex which is the relative distance from the center of a circle. Abilities that are closer to the center of the circle are closer to the construct of "general" intelligence Which is dead center on the model circle) and B) a circumplex which represents the relative distance around the circumference of the circle with abilities more highly correlated and thus closer together. the system identifies abilities through a set of coordinates.

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RADIAL GLIAL CELLS

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

Early in development, the radial glial cells are located in the neuroglia and span the width of the emerging cerebral hemispheres and guide migrating neurons

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RADIAL MAZE

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

Used extensively to study spatial memory, a radial maze consists of arms radiating out from a central point. An animal might run the maze to find food in only certain radii or to be required to do a systematic search through each arm while avoiding entering an arm twice.

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RADIAL NERVE

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

The sensory/motor nerve giving feeling and sense to the inner side of the forearm and hand. The fibers originate from the fifth through the eighth spinal nerve roots, eventually passing through the brachial plexus.

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RADIATION

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

Energy transmitted either through streams or through waves. In medicine, radiation is used either in diagnostic ways (x-rays and scans) or as treatment (radiation therapy to reduce or kill tumors). A more general definition is the outward movement of something from a central point.

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