Dictionary of Terms


Ultimate Causes Evolutionary conditions that have slowly shaped the behavior of a species over generations.

Unconditional Positive Regard Unconditional love and acceptance of an individual by another person.

Unconditional Response In classical conditioning, a response, such as salivation, that is naturally elicited by the UCS.

Unconditional Stimulus (UCS) In classical conditioning, a stimulus, such as food, that naturally elicits a reflexive response, such as salivation.

Unconscious The inaccessible part of the mind.

Underextension The use of a word to denote a smaller class of items than is appropriate, for example, referring only to one particular animal as a dog.

Undifferentiated Schizophrenia A type of schizophrenia characterized by fragments of the symptoms of other, different types of schizophrenia.

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