Glossary
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U |
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ubiquitin | |
unconditional reflexThe reflex that links an unconditional stimulus and an unconditional response, e.g. a series of neurons that links the presence of food in the mouth to secretion by the salivary glands. | |
unconditional response (UCR) | |
unconditional/unconditioned stimulus (UCS)A stimulus that evokes a response even in the absence of a history of conditioning, e.g. food in the mouth with regard to salivation. | |
uracil (U)One of the four nucleotide bases that occur in RNA. Uracil is not present in DNA (thymine (T) occurs in its place). | |