a stimulus that is just strong enough to elicit a response. unconditioned stimulus. any stimulus that is capable of eliciting an unconditioned response. See also conditioning. unstructured stimulus. an unclear or ambiguous stimulus, the perception of which is influenced to a greater extent by the characteristics of the perceiver than by those of the stimulus.
Yip, YIP, or yips may refer to: Yip (nickname), a list of people. Ye (surname), a Chinese surname also romanized as Yip (è), including a list of people.
For other uses, see Perry (disambiguation) . Perry is a surname of English origin, deriving from either the Old English pyrige (pear tree), referring to one who dwells by a pear tree.heir name, however, is a reference to the Old English word perie, meaning pear tree. The family held a seat there on lands granted by Duke William of Normandy, their liege lord, for their distinguished assistance at the Battle of Hastings in 1066.